<script>on mouseUpset cursor to nonevisual dissolve to blackvisual dissolvego last cdwait 4 secsvisual dissolve to blackvisual dissolvego first cdend mouseUp</script>
<text><span class="style1">he Macintosh Quadra 900 is one of Apple’s new additions to the high end Macintosh line and has many new features and enhancements which improve the performance and functionality in an entirely new floor standing form factor. Foremost in the performance improvements is the Motorola MC68040 microprocessor running at 25MHz, improved SCSI and NuBus, on-board Ethernet, and VRAM-based video.The new features of the Macintosh Quadra 900 are:</span><span class="style2">Power:</span><span class="style1">• 25 MHz MC68040 (roughly 2x IIfx performance)• Integrated memory management, FPU, and memory cache in the 68040• Improved NuBus performance• Improved SCSI performance and reliability• Dedicated I/O processors for serial communications, floppy, and ADB functions• A larger power supply with capacity of 300 watts </span><span class="style2">Flexibility: </span><span class="style1">• VRAM-based on-board video, providing up to 80% of the performance of the 8•24 GC (24-bit color on 16” monitors, 8 bits on 21” monitors) • Ethernet on-board, using the Apple Ethernet Cable System• Up to 4 half-height internal 5.25 inch peripherals, two of which can be removable media• Improved mono sound input and stereo sound output• Electronic key lockable</span><span class="style2">Growth:</span><span class="style1">• Four banks (4 slots) of dynamic RAM with 4 or 16Mb per bank for a maximum of 64 MB of physical RAM• 5 NuBus expansion slots• one in-line 68040 PDS• Support for over-sized NuBus cards</span><span class="style2">Form Factor:</span><span class="style1">The Macintosh Quadra 900 computer has a new, larger case that stands on the floor. This new case provides space for more internal SCSI peripheral devices than the standard Macintosh II case, and includes:• A floor-standing design for more space and better cooling• Space for as many as four internal SCSI peripheral devices, including full-height disk drives and removable media (in addition to floppy) • Provision for an internal CD-ROM player, integrated with system sound features • 5 NuBus slots• A larger power supply to support internal devices and higher-power NuBus cards (support for 2cards up to 25 Watts)• A locking keyswitch for security and operation as a server• Sound input for sound input device (included) and line signalsPossible configurations for the Macintosh Quadra 900 could be: • 4 half height SCSI drives </span><span class="style23">-or-</span><span class="style1">• 2 full height SCSI drives </span><span class="style23">-or-</span><span class="style1">• 1 full height and 2 half height SCSI drives </span><span class="style23">-or-</span><span class="style1">• 2 removable media SCSI devices in front(floppy counts as one) , and a combination of SCSI devices behind them.There is also the potential for 1/3 height drives (potential of three internal), or 1/4 height drives (small portable size drives, potential for 4 internal). The latter two combinations would be third party solutions, and would require a special carrier, and potentially a special cable. Termination has to be removed from drives whenever installed internally on the Macintosh Quadra 900.</span></text>
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<name>specs</name>
<script></script>
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card_7011.xml
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<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text>CENTRAL PROCESSING UNIT (CPU)• Microprocessor: Motorola MC68040• Address bus: 32-bit• Integrated FPU, memory management units and 8K of instruction and data cache• CMOS Real Time Clock OPERATING SYSTEM• Macintosh System Software 7.0.1 or laterMEMORY• 4 MB system RAM (expandable to 64 MB) using 80 ns DRAM • 1 MB of ROM (two 4Mbit ROMs at 150 ns each) soldered to the motherboard• ROM can be cached in the 040• 256 bytes PRAM in real time clock• 1MB VRAM standard, expandable to 2MB. 256K upgrade available at introINTERFACES• Apple Desktop Bus™ — single connector for ADB devices• RS-422 Serial Ports — two ports, 8-pin mini-DIN, 230.4K baud maximum• Ethernet — on-board using Apple Ethernet (FriendlyNet) cabling system• SCSI — one internal connector (for internal SCSI bus) and one external DB-25 connector• Video Out — DB-15 connector • Sound Input Device Input — mini-jack for mono Mic In (includes + 8 volt line)• Line Input — two line input jacks (RCA phono-type)—mono input• Mono Sound Output — stereo mini-jack with left and right channels electrically tied togetherDISK DRIVES • One internal 160MB 3.5-inch hard disk drive with interleave of 2—an option • One internal 1.4 MB SuperDrive™ VIDEO• VRAM-based on-board video, providing up to 80% of the performance of the 8•24 GC (24-bit color on 16” monitors, 8 bits on 21” monitors) SOUND• Improved mono sound input• Apple's custom digital sound chip provides 8-bit stereo sampling at 22.255 or 44.1 kilohertz, and includes four-voice wave-table synthesis capable of driving stereo headphones or other stereo equipment.• Built-in speaker: Magnetic, moving-coil speaker Maximum Power — 2.0 Watts Sound Power Level — 90 db/w {+/- 3 db} Distortion — 10% at 2 KHzELECTRICAL REQUIREMENTS• Line voltage: 85 to 270 volts AC, RMS automatically configured• Line frequency: 48 to 62 hertz single phase• Maximum power consumption: 300 wattsENVIRONMENTAL REQUIREMENTS• Operating temperature: 50° TO 104°F (10° TO 40° C)• Storage temperature: -40° TO 116.6°F• Relative humidity: 20% to 80% (noncondensing)• Altitude: 0 to 10,000 ft (0 to 3048 m)SAFETY AND EMI QUALIFICATIONS• FCC part 15 Class B Computing Devices• UL 478 Electronic Data Processing Equipment• CSA (Canadian Standards Assn.) 220 Information Processing and Business EquipmentSIZE AND WEIGHT• Height: 18.6 inches (473 mm)• Width: 8.9 inches (224 mm)• Depth: 20.6 inches (523 mm)• Weight: 36.75 lbs. (16.7 kg)</text>
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card_6791.xml
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<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text><span class="style1">ENGTHY MEMORY CHECKSThe more memory installed in the Macintosh Quadra 900, the longer the start-up memory check requires. Memory check with a fully loaded system (64 MB) is long, and gives user no indication that anything is happening.TERMINATION Terminators must be removed from all SCSI devices when they are installed internally. </span><span class="style2"></span><span class="style1">SERIAL SWITCHThe IIfx serial switch that was written for the IIfx will work for the Macintosh Quadra 900.</span><span class="style3"></span><span class="style1">KEYSWITCH REPLACEMENTIf a customer loses the key to their machine they either have to take the machine to a service provider and have the lock replaced, or have a locksmith come to create a new key and unlock the system. Apple service will not be keeping inventory of pre-cut Apple keys, but a customer can order blank keys to have duplicates made. </span></text>
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<name></name>
<script></script>
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card_4723.xml
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<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUpgo cd ports1end mouseUp</script>
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<id>2</id>
<text>Rear Port...NuBus Ports (5)</text>
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<text>The Macintosh Quadra 900 includes five internal NuBus ports with matching external ports where cable connectors can exit. With one exception of the number of ports, this is identical to other Macintosh II platforms. Unlike other Macintosh II computers with multiple NuBus slots/ports located on the right side of the rear case, the NuBus ports for the Macintosh Quadra 900 are located on the left of the rear case.</text>
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<name>P1</name>
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card_16521.xml
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<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
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<id>2</id>
<text>Rear Port...AC Output (monitor)</text>
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<content>
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<id>3</id>
<text>The same monitor power connector as found on other Macintosh II computers.This outlet is switched so that power is applied only when system power is ON.</text>
</content>
<name>P3</name>
<script></script>
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card_40013.xml
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<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
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<name>New Button</name>
<script>on mouseUpgo cd ports1end mouseUp</script>
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<content>
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<id>2</id>
<text>Rear Port...Power Supply Vent</text>
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<content>
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<id>3</id>
<text>Supplies fresh air to the power supply. A 150 CPM (cubic feet per minute) "muffin-type" fan – built into the power supply – draws air through this vent and into the power supply.</text>
</content>
<name>P4</name>
<script></script>
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card_40224.xml
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<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
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<content>
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<id>2</id>
<text>Rear Port...System Air Inlet</text>
</content>
<content>
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<id>3</id>
<text>Provides all of the air intake for cooling the main body of the Macintosh Quadra 900 computer.Cooling specific to the power supply is provided by a separate port and the power supply's built-in fan.</text>
</content>
<name>P5</name>
<script></script>
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card_40936.xml
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<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
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<id>2</id>
<text>Rear Port...Sound OUT Port</text>
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<content>
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<id>3</id>
<text><span class="style1">he Sound Out connector on the Macintosh Quadra 900 computer is similar to the one on the Macintosh II and has the same electrical characteristics. The audio amplifier for the internal speaker is more powerful than those on other models so that it can drive the speaker at higher sound levels (approximately 2 Watts per channel compared to .25 watts per channel on the Macintosh II). The higher levels are required because the computer is normally positioned on the floor, possibly under a desk, and thus the speaker is farther from the user's ear. Pin Out:</span><span class="style11">• Sleeve Ground• Ring Right .75-volt peak-to-peak audio signal right channel• Ring Left .75-volt peak-to-peak audio signal left channelThe internal speaker remains active when this jack is in use.</span><span class="style1"></span></text>
</content>
<name>P6</name>
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card_41064.xml
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<font>Chicago</font>
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<id>2</id>
<text>Rear Port... Mic Input Port</text>
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<content>
<layer>background</layer>
<id>3</id>
<text><span class="style1">onnector type: miniature stereo phone jack.Sound input device input; monaural signal. This jack includes a + 8-volt signal. It is important to not plug any other device such as headphones or another sound input device into this port and that device may become damaged by this power signal.Pin Out:</span><span class="style11">• Sleeve Ground• Ring Input• Tip + 8 volts</span></text>
</content>
<name>P7</name>
<script></script>
</card>
card_41346.xml
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<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text><span class="style1">he audio Line In connectors are standard RCA-type phono connectors. They are intended for users who wish to use the computer to sample line-level devices such as home stereo systems. The signals from the Line In connectors are internally mixed to a single (monophonic) audio signal; that signal is combined with the input from the Mic In connector and then sent to the sound input circuit. </span><span class="style23">Note: </span><span class="style1"> Even though there are two Line In connectors, and they are color coded with red and white bands, the stereo channels are mixed into a single monophonic signal; stereo information is lost. The computer has two connectors for the user’s convenience and so that an external mixer is not needed when connecting the computer to the most common type of consumer audio equipment. Pin Out:</span><span class="style11">• Sleeve Right/Left .75V peak-to-peak audio signal• Tip Ground</span></text>
</content>
<name>P8</name>
<script></script>
</card>
card_53937.xml
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<top>352</top>
<right>418</right>
<bottom>382</bottom>
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<showName> <false /> </showName>
<highlight> <false /> </highlight>
<autoHighlight> <false /> </autoHighlight>
<sharedHighlight> <true /> </sharedHighlight>
<family>0</family>
<titleWidth>-1</titleWidth>
<icon>-15648</icon>
<textAlign>center</textAlign>
<font>Chicago</font>
<textSize>12</textSize>
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<name>New Button</name>
<script>on mouseUpgo cd ports1end mouseUp</script>
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<content>
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<id>2</id>
<text>Rear Port...ADB</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text><span class="style1">he single ADB port uses the standard Macintosh mini-DIN8 connector.It will accept all known ADB devices.Pin Out:</span><span class="style11">1 ADB Data2 No Connection – reserved3 +5 volts4 Ground</span></text>
</content>
<name>P9</name>
<script></script>
</card>
card_47700.xml
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<highlight> <false /> </highlight>
<autoHighlight> <false /> </autoHighlight>
<sharedHighlight> <true /> </sharedHighlight>
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<titleWidth>-1</titleWidth>
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<textAlign>center</textAlign>
<font>Chicago</font>
<textSize>12</textSize>
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<name>New Button</name>
<script>on mouseUpgo cd ports1end mouseUp</script>
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<content>
<layer>background</layer>
<id>2</id>
<text>Rear Port...Serial Port — Printer</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text><span class="style1">he printer serial port uses the standard Macintosh mini-DIN8 connector and is addressed as the Printer Serial Port by the system.Pin Out:</span><span class="style11">1 Handshake output DTR2 Handshake input CTS3 Transmit Data (inverted)4 Ground5 Receive Date (inverted)6 Transmit Data7 No Connection8 Receive Data</span></text>
</content>
<name>P10</name>
<script></script>
</card>
card_51949.xml
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<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
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<left>389</left>
<top>352</top>
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<bottom>382</bottom>
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<showName> <false /> </showName>
<highlight> <false /> </highlight>
<autoHighlight> <false /> </autoHighlight>
<sharedHighlight> <true /> </sharedHighlight>
<family>0</family>
<titleWidth>-1</titleWidth>
<icon>-15648</icon>
<textAlign>center</textAlign>
<font>Chicago</font>
<textSize>12</textSize>
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<name>New Button</name>
<script>on mouseUpgo cd ports1end mouseUp</script>
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<content>
<layer>background</layer>
<id>2</id>
<text>Rear Port...Serial Port — Modem</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text><span class="style1">he modem serial port uses the standard Macintosh mini-DIN8 connector and is addressed as the Modem Serial Port by the system.Pin Out:</span><span class="style11">1 Handshake output DTR2 Handshake input CTS3 Transmit Data (inverted)4 Ground5 Receive Date (inverted)6 Transmit Data7 No Connection8 Receive Data</span></text>
</content>
<name>P11</name>
<script></script>
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card_52344.xml
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<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
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<style>transparent</style>
<showName> <false /> </showName>
<highlight> <false /> </highlight>
<autoHighlight> <false /> </autoHighlight>
<sharedHighlight> <true /> </sharedHighlight>
<family>0</family>
<titleWidth>-1</titleWidth>
<icon>-15648</icon>
<textAlign>center</textAlign>
<font>Chicago</font>
<textSize>12</textSize>
<textStyle>plain</textStyle>
<name>New Button</name>
<script>on mouseUpgo cd ports1end mouseUp</script>
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<content>
<layer>background</layer>
<id>2</id>
<text>Rear Port...SCSI</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text><span class="style1"> standard DB 25-pin SCSI connector (female) found on all recent Macintosh compact and modular computers.Pin Out:</span><span class="style11">1 Request2 Message3 Input/Output4 SCSI bus reset5 Acknowledge6 Busy7 Ground8 Data bit 09 Ground10 Data bit 311 Data bit 512 Data bit 613 Data bit 714 Ground15 Command/Data16 Ground17 Attention18 Ground19 Select20 Data parity21 Data bit 122 Data bit 223 Data bit 424 Ground25 Terminator powerTotal length of all cables not to exceed 20 feet (6 meters)</span></text>
</content>
<name>P12</name>
<script></script>
</card>
card_52757.xml
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<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
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<visible> <true /> </visible>
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<enabled> <true /> </enabled>
<rect>
<left>389</left>
<top>352</top>
<right>418</right>
<bottom>382</bottom>
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<style>transparent</style>
<showName> <false /> </showName>
<highlight> <false /> </highlight>
<autoHighlight> <false /> </autoHighlight>
<sharedHighlight> <true /> </sharedHighlight>
<family>0</family>
<titleWidth>-1</titleWidth>
<icon>-15648</icon>
<textAlign>center</textAlign>
<font>Chicago</font>
<textSize>12</textSize>
<textStyle>plain</textStyle>
<name>New Button</name>
<script>on mouseUpgo cd ports1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>Rear Port...AAUI (FriendlyNet)</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text>The Ethernet implementation on the Macintosh Quadra 900 is the same as on the Ethernet NuBus card announced earlier in 1991, and shipped in July. The Ethernet connector on the Macintosh Quadra 900 computer is the Apple AUI (AAUI) connector, which accepts any FriendlyNet adapter. There is a different EtherNet adapter for each of the different kinds of Ethernet standard cable: the AUI (thick) cable, the CheaperNet (thin) cable, and the 10BaseT (twisted pair) cable. </text>
</content>
<name>P13</name>
<script></script>
</card>
card_53307.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUpgo cd hoodMenuend mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>Logic Board...Click on a component</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text><span class="style1">he major components of the Macintosh Quadra 900 motherboard are shown to the right.Please notice that some components are shown as grayed images. These components are part of the motherboard's supporting circuitry and are not specifically called out in the following cards.Please </span><span class="style2">click</span><span class="style1"> on each component to view its name and technical information.</span></text>
</content>
<name>MB Start</name>
<script></script>
</card>
card_2285.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>Serial Ports{Printer & Modem}</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text>Standard Apple serial connectors (mini DIN-8).Individually labeled and recognized by the system as the serial printer port and the modem serial port.See REAR PORTS diagrams for additional information.</text>
</content>
<name>MB5</name>
<script></script>
</card>
card_14939.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>Analog Sound Line INs</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text>Standard phono connectors for users who wish to use the computer to sample line-level devices such as home stereo systems. The signals are internally mixed to a single (monophonic) audio signal.See REAR PORTS diagrams for additional information.</text>
</content>
<name>MB6</name>
<script></script>
</card>
card_15515.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>Microphone In Jack</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text>The Macintosh Quadra 900 computer has a Mic In jack on the rear panel, and a sound input device is included with the computer. The jack is a stereo mini jack.The sound input device is similar to the one provided with the Macintosh IIsi and the Macintosh LC, but it has a longer cable to allow it to reach the floor-standing case.See REAR PORTS diagrams for additional information.</text>
</content>
<name>MB7</name>
<script></script>
</card>
card_16098.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>Sound Out Jack</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text>A single, stereo mini jack, similar to the Sound OUT on the Macintosh II with the same electrical characteristics. The audio amplifier drives both this output jack and the internal speaker at approximately 2 Watts per channel compared to .25 watts per channel on the Macintosh II.See REAR PORTS diagrams for additional information.</text>
</content>
<name>MB8</name>
<script></script>
</card>
card_17098.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>AC/DC Video Chip</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text>A custom Color Look-Up Table and Digital-to-Analog Converter (CLUT/DAC) IC developed by Apple. This chip is currently used in the Macintosh Display Card 4•8, 8•24, and the 8•24GC.</text>
</content>
<name>MB10</name>
<script></script>
</card>
card_17623.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>SONIC Chip</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text><span class="style1">rovided by National, this is the same chip found on the Ethernet NB card.This device includes an IEEE 802.3 encoder/decoder (ENDEC), media access control (MAC) unit, separate 32 byte send and receive FIFOs, and DMA controller in one device. SONIC is housed in a 132-pin PQFP package. The Ethernet global address (which provides a unique 48-bit identity for each CPU built) is provided by a small ROM.The SONIC controller includes DMA capability. It will request the bus and transfer data b</span><span class="style11">etween its internal registers and main memory.</span></text>
</content>
<name>MB11</name>
<script></script>
</card>
card_17942.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>SCSI Controller ICs (2)</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text>In the Macintosh Quadra 900, the SCSI bus is divided into internal and external buses, each controlled by its own NCR 53C96 device. The internal and external SCSI buses are logically connected but electrically separate. The external bus is electrically isolated from the internal bus so that changes in external cabling and termination have no effect on the performance of the internal SCSI devices. The cabling and termination of the internal SCSI bus are optimized so that the 53C96 that controls the internal bus can support data transfers at a faster rate—up to 5 MB/sec (the maximum the chip can transfer is 6 Mb/sec). Earlier Macintosh computers were capable of a 3 Mb/sec transfer rate. </text>
</content>
<name>MB12</name>
<script></script>
</card>
card_21555.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>Static RAM (SRAM) </text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text>Each IOP has 32K of external RAM that holds the driver and acts as a buffer for the data processed by the processor. Since the CPU can access the Static RAM Cache in two clock cycles (zero wait states), applications can run very quickly. </text>
</content>
<name>MB18</name>
<script></script>
</card>
card_22085.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>BATMAN Chip</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text>A custom IC that replaces the Apple Sound Chip. This chip also acts as the sound amplifier for the Macintosh Quadra 900.Power output to the speaker is increased from the standard Macintosh .2 W to </text>
</content>
<name>MB19</name>
<script></script>
</card>
card_22600.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>Digitally Filtered Audio Chip (DFAC)</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text><span class="style1">erves as the sound input and filter IC. </span><span class="style1">The DFAC is an Apple custom IC that is also used in the Macintosh LC. The DFAC IC includes the anti-aliasing filter and analog-to-digital converter (ADC) for sound input. It also contains a digital filter for conditioning output data before it is sent to the DAC.</span></text>
</content>
<name>MB20</name>
<script></script>
</card>
card_23201.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>3</id>
<text>CMOS device packaged in a 44-pin plastic leadless chip carrier (PLCC).Combination MFM/GCR controller. This is the device that supports the SuperDrive‚Ñ¢ high density floppy disk drive. </text>
</content>
<content>
<layer>background</layer>
<id>2</id>
<text>Super Woz Integrated Machine (SWIM)</text>
</content>
<name>MB24</name>
<script></script>
</card>
card_25267.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>Internal SCSI connector</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text><span class="style1">nternal 40-pin SCSI connector for internal hard disk drives.Pin Out:</span><span class="style11">1 +5 volts to hard disk drive motor2 +5 volts to hard disk drive motor3 Ground4 Ground5 Ground6 SCSI data bit 07 Ground8 SCSI data bit 19 Ground10 SCSI data bit 211 Ground12 SCSI data bit 313 Ground14 SCSI data bit 415 Ground16 SCSI data bit 517 No connection18 SCSI data bit 619 Ground20 SCSI data bit 721 Ground22 SCSI data bit parity23 Ground24 +5 volts to disk drive logic25 SCSI attention26 SCSI busy27 Ground28 SCSI acknowledge29 SCSI bus reset30 SCSI message31 Ground32 SCSI select33 SCSI input/output34 SCSI control or data35 Ground 36 SCSI request37 Ground 38 Ground 39 +5 volts to hard disk drive motor40 +5 volts to hard disk drive motor</span></text>
</content>
<name>MB26</name>
<script></script>
</card>
card_26319.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>NuBus Connectors</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text><span class="style1">he Macintosh Quadra 900 contains a total of five (5) NuBus connectors on the motherboard.Each of the five slots is a Euro-DIN 96-pin connector providing access to all of the main logic board's resources, including RAM, ROM, and I/O devices.The NuBus has a full 32 bit address and data bus, and operates synchronously on a 10-MHz clock.____________________________</span><span class="style23">Note:</span><span class="style2">The Processor Direct Slot is located directly in-line with NuBus slot #1. If the PDS is occupied, the board will overhang NuBus slot #1 so that no NuBus card will be able to use slot #1.</span><span class="style1">Pin Out:The following are the pinouts for the connector for columns A, B, and C.• A •</span><span class="style11">1 -12 volts2 Ground3 SPV4 SP5 TM16 AD17 AD38 AD59 AD710 AD911 AD1112 AD1313 AD1514 AD1715 AD1916 AD2117 AD2318 AD2519 AD2720 AD2921 AD3122 Ground23 Ground24 ARB125 ARB326 GA127 GA328 ACK29 +5 volts30 RQST31 NMRQ32 +12 volts</span><span class="style1">• B •</span><span class="style11">1 -12 volts2 Ground3 Ground4 +5 volts5 +5 volts6 +5 volts7 +5 volts8 -5.2 volts9 -5.2 volts10 -5.2 volts11 -5.2 volts12 Ground13 Ground14 Ground15 Ground16 Ground17 Ground18 Ground19 Ground20 Ground21 Ground22 Ground23 Ground24 -5.2 volts25 -5.2 volts26 -5.2 volts27 -5.2 volts28 +5 volts29 +5 volts30 Ground31 Ground32 +12 volts</span><span class="style1">• C •</span><span class="style11">1 RESET2 Ground3 +5 volts4 +5 volts5 TM06 AD07 AD28 AD49 AD610 AD811 AD1012 AD1213 AD1414 AD1615 AD1816 AD2017 AD2218 AD2419 AD2620 AD2821 AD3122 Ground23 PFD24 ARB025 ARB226 GA027 GA228 START29 +5 volts30 +5 volts31 Ground32 Clock</span><span class="style1"></span></text>
</content>
<name>MB27</name>
<script></script>
</card>
card_26855.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>VRAM SIMM Sockets</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text><span class="style1">dditional VRAM can be added to the Macintosh Quadra 900 to enhance the video capabilities of the computer.VRAM SIMMS contain 256K VRAM each. Up to 4 VRAM SIMMs can be added to the Macintosh Quadra 900 totally 2MB. </span><span class="style11"></span></text>
</content>
<name>MB28</name>
<script></script>
</card>
card_27183.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>Video RAM (VRAM)</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text>The Macintosh Quadra 900 contains 1 MB of VRAM soldered onto the motherboard (eight chips of 128Kbits x 8 = 1 MB). There is expansion to 2MB total by adding 4 256K VRAM SIMMs.Working in conjunction with the new AC/DC Video chip, this provides the Macintosh Quadra 900 with the basic video capabilities of the Macintosh Display Card 8•24. If additional VRAM is added, this capability increases to about 80% that of the Display Card 8•24GC.</text>
</content>
<name>MB29</name>
<script></script>
</card>
card_27707.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>Junction Data Bus (JDB)</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text><span class="style1"> two-chip set consisting of the the JDB and the Relayer provide a transparent connection between the System Bus and the IO bus. The I/O bus enables the computer to use the same I/O device controllers used in the Macintosh IIfx. The I/O bus clock runs at 15.6672 MHz and is completely asynchronous to the system bus clock. This two-chip setup allows any System bus master such as the 040, a NuBus master card, or a master device on the PDS to request bus access and transfer data to slaves located on the IO bus. It also allows IO bus masters like SONIC to access main memory which is located on the System bus.This improves the overall speed of the system by</span><span class="style2"> </span><span class="style1">isolating the faster bus (system bus) from the slower bus (IO bus).Two ICs are used because of the high pin count required.The functions of the JDB IC include• controlling the data path (dynamic bus sizing and data byte lane routing)• synchronizing and distributing the reset signals</span></text>
</content>
<name>MB32</name>
<script></script>
</card>
card_29799.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>Relayer</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text>A two-chip set consisting of the the Junction Data Bus (JDB) and the Relayer provide a transparent connection between the System Bus and the IO bus. The functions of the Relayer IC include• generating chip select and DSACK signals for devices on the I/O bus• converting timing signals between the system bus and the I/O bus• arbitrating between the system bus and the I/O bus• acting as watchdog for bus activity and timeout• controlling the address-bus transceiver ICs• generating the clock signal for the VIA ICsSee previous card on the JDB for more information about the combined functions of these ICs.</text>
</content>
<name>MB34</name>
<script></script>
</card>
card_30223.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>YANCC Chip</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text>In the Macintosh Quadra 900 computer, three chips comprise the interface between the system bus and the NuBus: the YANCC (Yet Another NuBus Controller Chip) IC and two 16-bit transceiver ICs that are the same as the ones in the Macintosh IIci. The YANCC IC maps certain system bus cycles to NuBus cycles and certain NuBus cycles to system bus cycles. The features of the YANCC IC include:• support for all types of single data transfers in either direction• a buffer, one long word deep, for appended writes from the MC68040 to the NuBus• support for block move transfers between NuBus masters and main memory• support for pseudo-block transfers between the MC68040 and NuBus slaves• support for some new functions defined in the NuBus ’90 specificationUnlike the NuBus controllers in previous Macintosh computers, the YANCC IC generates an interrupt when there is an error involving the write buffer. Software controls this interrupt by means of a control and status register in the YANCC. </text>
</content>
<name>MB36</name>
<script></script>
</card>
card_31384.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>ORWELL Chip</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text>A custom IC that connects to the system bus and controls burst-mode data transfers to the main RAM.The Orwell IC controls four banks of dynamic RAM, each of which accepts standard 80 ns SIMMs containing 1 MB, 4 MB (256K and 2Mb are not supported), giving total memory sizes from 4 MB to 16 MB for each bank. 16MB SIMMs have not been thoroughly tested on Eclipse.The Orwell IC contains registers that the system software uses to set the starting address of each bank of memory. At startup time, the system software determines the sizes of the banks and assigns the bank starting addresses so that the banks occupy contiguous memory spaces, unlike that of the IIci and IIsi that have split memory maps. </text>
</content>
<name>MB39</name>
<script></script>
</card>
card_12419.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>CPU</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text>The Motorola 68040 running at a clock speed of 25 MHz, in conjunction with the other Macintosh Quadra 900 processor circuitry, gives the Quadra 900 up to 2x the effective speed of the Macintosh IIfx.The 68040 features:• MC68881/MC68882-Compatible Floating Point Execution Unit• MC68030 Compatible Integer Execution Unit• Independent Instruction and Data Memory Management Units (MMUs)• 4K Byte Physical Instruction Cache and 4K-Byte Physical Data Cache accessible simultaneously • Concurrent integer unit, FPU, MMU and Bus Controller Operation maximizes throughput</text>
</content>
<name>MB40</name>
<script></script>
</card>
card_33307.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>ROM SIMM Slot</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text><span class="style1">he Macintosh Quadra 900 ROM SIMM slot allows for easy update to the system ROMs if necessary and a larger ROM space if necessary. It also makes it easier to configure a system with ROMs from different countries. Pin Out:</span><span class="style11">1 +5 volt2 No connection3 No connection4 A25 A36 A47 A58 A69 A710 Ground11 /CS012 /OE13 +5 volt14 D015 D116 D217 D318 D419 D520 D621 D722 D823 D924 D1025 D1126 D1227 D1328 D1429 D1530 Ground31 A832 A933 A1034 A1135 A1236 A1337 A1438 A1539 A1640 A1741 A1842 A1943 A2044 A2145 A2246 +5 volt47 D1648 D1749 D1850 D1951 D2052 D2153 D2254 D2355 D2456 D2557 D2658 D2759 D2860 D2961 D3062 D3163 +5 volt64 Ground</span></text>
</content>
<name>MB43</name>
<script></script>
</card>
card_35580.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>Back-up Battery</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text>Standard 3.6 volt lithium back-up battery (type 1-24 A).Provides power to system clock and parameter RAM when system in not connected to an AC power source. Battery is contained in a plactic holder which is soldered to the motherboard. When changing battery, be sure that the suystem is turned OFF and IS plugged into an AC outlet.</text>
</content>
<name>MB45</name>
<script></script>
</card>
card_35924.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<part>
<id>4</id>
<type>button</type>
<visible> <true /> </visible>
<reserved5> 0 </reserved5>
<reserved4> 0 </reserved4>
<reserved3> 0 </reserved3>
<reserved2> 0 </reserved2>
<reserved1> 0 </reserved1>
<enabled> <true /> </enabled>
<rect>
<left>586</left>
<top>328</top>
<right>635</right>
<bottom>340</bottom>
</rect>
<style>transparent</style>
<showName> <false /> </showName>
<highlight> <false /> </highlight>
<autoHighlight> <false /> </autoHighlight>
<sharedHighlight> <true /> </sharedHighlight>
<family>0</family>
<titleWidth>0</titleWidth>
<icon>0</icon>
<textAlign>center</textAlign>
<font>Chicago</font>
<textSize>12</textSize>
<textStyle>plain</textStyle>
<name>MB47</name>
<script>-- on mouseUp-- repeat 3-- set hilite of bg button MB46 to true-- wait 3-- set hilite of bg button MB46 to false-- wait 3-- end repeat-- go cd MB46-- end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>RAM SIMM Slots -Banks A-D</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text>Four banks of RAM SIMM sockets. Each bank accepts standard 80 ns SIMMS containing 1 MB, 4 MB, or perhaps 16 MB SIMMS (256K and 2 MB SIMMS are not supported), giving total memory sizes from 4 MB to 16 MB in each bank.This gives the Macintosh Quadra 900 a total capacity of 64 MB RAM.If one slot in a given bank is filled, then all slots in that bank must be populated. It is not possible to mix the speed of RAM, even between banks.The Macintosh Quadra 900 can also use 60 ns SIMMs, but the Orwell IC which provides RAM control is programmed for 80 ns, so no speed improvement would be realized.</text>
</content>
<name>MB46</name>
<script></script>
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card_39631.xml
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<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<script>on mouseUprepeat 3set hilite of button MB1 to truewait 3set hilite of button MB1 to falsewait 3end repeatgo cd MB1end mouseUp</script>
</part>
<content>
<layer>background</layer>
<id>2</id>
<text>Reset and Interrupt Switches</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text>These switches are connected to the optional programmer's switch. RESET SWITCH (Top)The reset switch causes the system to restart the computer just like the RESTART menu item in the Finder, with one major exception--it does not quit any applications or save any open files before the reset. Pressing this switch causes you to lose the contents of memory and any documents you were working on since the last change.INTERRUPT SWITCH (Bottom)Pressing the interrupt switch will cause one of two things to happen. 1) If MacsBug is installed, pressing this switch will drop you into MacsBug. 2) If MacsBug is not installed, you will get a window and an > in the window. Press G and then RETURN to return to your application. In most cases everything will be ok after you press return. To be safe, save; save all files and restart the computer.</text>
</content>
<name>MB49</name>
<script></script>
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card_5255.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text>Overview: The Macintosh Quadra 900 requires system version 7.0.1 or greater to operate. This is a CPU-specific revision of the software. System 7.0.1 comes installed on the Macintosh Quadra 900 internal hard disk drive, and ships with a complete set of back-up floppy disks.</text>
</content>
<name>sware</name>
<script></script>
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card_18623.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text>It is possible in System 7.0.1 to set aside part of RAM to use as a temporary hard disk via the Memory Control Panel.Called RAM Disk, this operates at high speed, but reduces the amount of system RAM available for application use.Users may encounter "Out of Memory..." dialogs if too much RAM is dedicated to RAM Disk.</text>
</content>
<name>sware1</name>
<script></script>
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card_11152.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text><span class="style1">he ROM in the Macintosh Quadra 900 is soldered directly to the motherboard, and consist of two 4Mbit ROMs at 150ns (each ROM is a 256k x 4 device)=1 Mb ROM. As with all instructions, ROM can be cached in the 040. The memory controller {Orwell} supports burst access to the ROM via the 68040 fake burst mechanism</span><span class="style2">. </span><span class="style1"> This means that Orwell asserts TBI (Transfer Burst Inhibit) with TA for accesses to ROM, which cannot be bursted. This allows the 040 to try a burst, and then notice that it must do the accesses in 4 individual long words..</span></text>
</content>
<name></name>
<script></script>
</card>
card_11452.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text>The Macintosh Quadra 900 is one of the first Macintosh computers to utilize the 68040 microprocessor from Motorola.Along with this advance in technology, there are several other new technologies that have gone into the Macintosh Quadra 900 that you will need to understand.</text>
</content>
<name>tech</name>
<script></script>
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card_44964.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text>Central to the Macintosh Quadra 900 is a new processor chip from Motorola, the 68040 (040) running at 25 MHz. The MC68040 is different from the MC68020 and MC68030 in several ways. The most obvious differences are the integrated FPU, memory management units, and 8K of instruction and data cache which help increase the performance of the chip. The evolution of the Motorola 68000 chip set, and its use in Macintosh II computers, looks something like the diagram at the right. The most important features of the MC68040 for the Macintosh Quadra 900 are:• MC68881/MC68882-Compatible Floating Point Execution Unit.• MC68030 Compatible Integer Execution Unit• Independent Instruction and Data Memory Management Units (MMUs)• 4K Byte Physical Instruction Cache and 4K-Byte Physical Data Cache Accessible Simultaneously• Concurrent integer unit, FPU, MMU and Bus Controller Operation Maximizes Throughput</text>
</content>
<name>tech1</name>
<script></script>
</card>
card_42554.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text>New technology...Instruction & Data Caches</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text><span class="style1">ecause the probability is high that instructions and data that are used in a program will be used and then reused in a short period of time, the MC68040 has two on-chip physical caches. Previous Macintosh computers that use the 68030 processor have required external cache memory implementations to gain performance. A cache implementation strategy for these machines are costly. A Macintosh IIci required an additional cache card, and the IIfx had the additional cost of extra cache chips on the motherboard. The 68040 processor integrates the cache into the chip increasing speed while decreasing costs.The caches in the 040 processor are contained in the instruction and data memory units themselves. By reducing the number of bus transfers required by the processor to fetch information from memory, the caches improve the overall performance of the machine.Two separate 4K byte on-chip instruction and data caches operate independently, and are accessed in parallel with address translation. Each cache and corresponding MMU resides on a separate internal address bus and data bus, allowing simultaneous access to both. The processor fills the cache lines using burst mode accesses which transfer the entire line (four long words). This mode of operation not only fills the cache efficiently, but also captures adjacent instruction or data items that are likely to be required in the near future due to locality characteristics of the executing task. </span><span class="style3">Definitions:</span><span class="style16"></span><span class="style2">Writethrough: </span><span class="style1"> A memory update policy in which all processor write cycles are written to both cache and memory.</span><span class="style2">Copyback: </span><span class="style1">Cache data is updated without a subsequent write to memory until necessary. It is an operation in which a cache line is copied back to memory to enforce cache coherency. A copyback is done either on a snoop that hits on modified cache data or as a result of a copyback command initiated by the processor.____________________________The data cache provides writethrough or copyback write modes that can be configured on a page-by-page basis. For writes that hit in copyback pages, the data is used to update the cache line without writing the data to memory immediately. This "dirty" data is copied to memory only when required, either to allow replacement of the cache line by new data, or as a result of explicit flushing of the cache line, resulting in a lower bus bandwidth requirement for the processor. Cache coherency for both caches is maintained by bus snooping logic which allows the 040 to monitor accesses by an alternate bus master. When an alternate master performs bus transfers, the 040 can update cache lines which hit during an external write, or source data from dirty data cache lines which hit during an external write, or source data from dirty data cache lines while inhibiting data from memory during external reads. Snooping is a hardware function which allows the cache to monitor bus activity by alternate bus masters and take the appropriate action when an alternate master accesses data which is in the 68040 rather than main memory. This has the advantage of hiding cache coherence issues from the software, but the disadvantage of slowing the processor during the snoop cycle. In other words it attempts to predict when data will be requested that is already in a cache and lets that happen first. Some of the ASICs in the Macintosh Quadra 900 do support snooping, specifically with NuBus transactions. On the Macintosh Quadra 900 and the Macintosh Quadra 700, the writes to the caches are always in copyback mode.The current software architecture dies not count on bus snooping. The memory manager has been modified to allow programs to request a block of non-cached memory. A separate heap for non-cacheable memory is created and managed by the memory manager. This architecture does require a new set of memory manager calls, but has the advantage of not allowing the processor down during external bus activity. </span><span class="style12">All</span><span class="style1"> I/O transactions on the Macintosh Quadra 900 are marked as non-cacheable and use serialized writes, therefore prohibiting any problems with 'dirty' data being accessed and assuring that the data is stored in memory exactly the way it's input.Devices which transfer data on the system bus (including PDS bus masters) must drive the snoop pins to indicate no snoop.Because the Macintosh operating system doesn't differentiate between data and instructions, many third party applications do not flush the data cache properly (moving the updated date from the cache to memory) DTS and Evangelism are working closely with third party developers to assure that they have 040 compatible applications at introduction. ____________________________</span><span class="style3">The on-chip FPU and large physical instruction and data caches result in improved system performance and increased functionality. The independent instruction and data MMUs and increased internal parallelism also improve performance. </span></text>
</content>
<name>tech2</name>
<script></script>
</card>
card_45333.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text>Math co-processor functions can provide: • Faster recalcs in spreadsheets• Faster graphics updates• Faster 3D renderings • Faster database searchesThe MC68040 contains an on-chip FPU which is different than, but compatible with the MC68882 (Mac IIx-IIsi). The FPU has been optimized to execute the most commonly used subset of the MC68882 instruction set, and includes additional instruction formats for single and double-precision rounding of results. Software emulations are used whenever a floating-point instruction is not supported in the hardware. In the Macintosh Quadra 900, the code for transcendental functions such as sines and cosines reside in ROM, and will compute at the same speed, or slightly slower than on the IIfx. Few software packages use these computations, and will most likely not be a problem. FPU instructions and integer instructions (in the integer unit) execute concurrently.</text>
</content>
<name>tech6</name>
<script></script>
</card>
card_41796.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text>Improved I/O features also contribute to the higher performance of the Macintosh Quadra 900 computer. Like the Macintosh IIfx, the Macintosh Quadra 900 has intelligent I/O processors (IOPs) on the ports for the floppy disk, Apple Desktop Bus‚Ñ¢ (ADB), and serial I/O. These ASICs, which feature a built-in microprocessor, DMA controller, timer, and external Static RAM (SRAM) are used to off-load floppy disk, ADB, modem and printer port interrupts. These are the same IOPs as found in the IIfx, therefore the serial init for the IIfx which overrides the IOPs can also be used if needed.These IOPs are the main performance differentiation between Macintosh Quadra 700 and the Macintosh Quadra 900 (the Macintosh Quadra 700 doesn't have the IOPs). The difference in performance will only be about 1% unless the Macintosh Quadra 900 is used as a Router. The SCSI interface uses separate ICs for internal and external devices, the 56C93. </text>
</content>
<name>tech3</name>
<script></script>
</card>
card_43322.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text>New technology...Internal Mass Storage</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text><span class="style1">he floor-standing case provides flexibility for internal mass-storage devices. There are four half-high mounting locations. Two of the four are in the front of the case, where they are accessible for removable media. Any of the four locations can accommodate either 3.5-inch or 5.25-inch hard disk drives. The 1.44 floppy </span><span class="style2">does not</span><span class="style1"> take up one SCSI slot, therefore there are 4 additional SCSI connections possible. A hard disk drive for the Macintosh Quadra 900 computer can be any 3.5-inch or 5.25-inch half-height device or a 5.25-inch full-height device, allowing the Macintosh Quadra 900 to accommodate any current Apple disk drives—20 MB, 40 MB, 80 MB, or 160 MB—as well as future Apple® products or third-party devices. Third-party full-height drives are available with even higher capacities. Third parties will have to ship their internal devices with a carrier, and Evangelism has provided 3rd party suppliers with all of the specs. Users must keep track of the SCSI ids of their internal devices, Get Info on each drive to check the ids, or use a public domain package such as SCSI Probe to make sure they won’t have a conflict on the SCSI bus. The upper front location will always be filled with a 1.44 MB SuperDrive disk drive at introduction, but may ship without one at a later date as an optional configuration. The lower front location can accommodate a backup device, either tape or magneto-optical, or a non-removable SCSI device. One of the internal storage devices in the Macintosh Quadra 900 computer can be a CD-ROM drive, installed at the front for media access. The drive connects to the internal SCSI bus, and an additional cable takes the audio signals from the CD-ROM to the main circuit board, and therefore audio CDs will be heard through the system speaker. When speakers are connected to the external sound out on the machine, CD and sys beep and other system sounds will be heard through the speakers as well. This integration of the audio signals into the computer provides three functions that are important for multimedia applications: • Ability to play audio from the CD-ROM through the internal sound system• Ability to mix audio from the CD-ROM with computer-generated sound• Ability to perform digital recording of audio from the CD-ROMVolume control for the internal AppleCD SC Plus is done through software. The CD Remote DA detects that the CD ROM drive is internal, and provides volume control. On external drives, the software control is not visible, and the hardware control is used. The three sound outputs are mixed when the CD ROM drive is internal: CD ROM (44K); Macintosh output (22K- 16bit); sound input device play through (8 bit). </span></text>
</content>
<name>tech7</name>
<script></script>
</card>
card_18841.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text><span class="style1">hird parties have the opportunity with the Macintosh Quadra 900 to write a new driver that can implement disk arrays and mirroring. Today third parties use a NuBus slot for each drive in the array when implementing disk arrays.</span><span class="style2"></span><span class="style1"></span><span class="style23">Definition: </span><span class="style1">Disk ArrayDisk arrays can improve fault tolerance, increase performance, and expand storage capacity. The idea behind disk arrays is to combine several inexpensive disks that appear to the operating system as one logical disk. The request for small amounts of data are serviced independently and large data requests are spread over several drives, thus providing better performance. Fault tolerance is provided by storing error-correcting data on one or more drives, thus reducing down time from failed drives.A RAID level are five disk array implementations that differ by the way an array controller writes data and generates parity information. Although referred to as ‘levels,’ a higher number isn’t necessarily better. The RAID level depends on the applications, type of data traffic, and priorities. Disk mirroring is the most common fault tolerance scheme used on NetWare LANs, and is defined as RAID level 1. All data is written to the two drives, so if the primary disk fails, the secondary disk takes over. Because this requires two disk subsystems, it is an inefficient method of ensuring fault tolerance. RAID levels 2-5 use parity information to restore data. Using parity typically requires 20 % of the drive space; mirroring uses 50 %. A sector’s parity is the exclusive OR of its data.Disk arrays are not a replacement for backups. They protect a user from data loss due to a head crash or disk failure, not from problems such as power failures. </span><span class="style2">See ‘LAN Magazine,’ July 1991 issue for more information on disk arrays.</span></text>
</content>
<name>tech7b</name>
<script></script>
</card>
card_20063.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text><span class="style1">he Macintosh Quadra 900 comes with a security keyswitch which allows its owner to limit the access to the computer. The keyswitch has three positions: OFF, ON, and SECURE. The key can be removed while the switch is in any of the three positions. Operation of the keyswitch is designed to provide a first level of security for users. </span><span class="style12">Keyswitch OFF position</span><span class="style1">When the keyswitch is in the OFF position, the computer cannot be turned on. Moving the keyswitch from either the ON or SECURE position to the OFF position turns the machine off. __________________________</span><span class="style23">Warning:</span><span class="style1"> Turning the keyswitch to OFF when the computer is running turns the power off immediately: the system software does not have a chance to close files. If you turn the machine off by turning the keyswitch to OFF, you can lose data.   ____________________________ </span><span class="style12">Keyswitch ON position</span><span class="style1">When the keyswitch is in the ON position, the computer can be turned on from the keyboard and turned off by choosing the Shut Down menu item. When the keyswitch is in the ON position, the user controls the power the same way as on any other computer in the Macintosh II family. </span><span class="style12">Keyswitch SECURE position</span><span class="style1">When the keyswitch is in the SECURE position, the ADB devices and the floppy disk are disabled. When power is applied to the computer while the keyswitch is in the SECURE position, the computer automatically starts up. The SECURE position is intended for situations involving remote access (for things like Timbuktu) or in which the computer is a network server. When in the secure position, the machine will automatically power on if power is disrupted (if cable is removed, or power goes out).If a customer loses the key to their machine they either have to take the machine to a service provider and have the lock replaced, or have a locksmith come to create a new key, and unlock the system. Apple service will not be keeping inventory of Apple keys, but a customer can order blank keys to have duplicates made. </span></text>
</content>
<name>tech7</name>
<script></script>
</card>
card_55529.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text><span class="style1">he Orwell IC connects to the system bus and provides control and timing signals for RAM and ROM. The Orwell IC supports all types of MC68040 memory access including burst modes. Orwell allows all memory to be marked cacheable, which means we don't assert cache-inhibit.When the computer is reset, the Orwell IC maps ROM addresses into memory beginning at address $0000 0000 and disables the system RAM. As soon as the ROM code addresses the normal ROM space ($4000 0000), the Orwell IC automatically remaps the ROM to its normal addresses and restores RAM addressing starting at $0000 0000. The microprocessor always starts upon reset at address 0. At that time we don’t have anything in RAM (which resides at address 0 after reset). Therefore, we need ROM code to be accessed, and since its normal addressing starts at $40000000, we need to remap it down so the processor has some code to fetch upon reset. It is done this way on every MacII.</span><span class="style3"></span><span class="style16">RAM control</span><span class="style3"></span><span class="style1">The Orwell IC controls four banks of dynamic RAM each of which accepts standard 80 ns SIMMs containing 1 MB, 4 MB, and perhaps 16 MB (256K and 2 MB are not supported), giving total memory sizes from 4 MB to 16 MB for each bank. This means that the Macintosh Quadra 900 could have a total of 64Mb. 16Mb SIMMs have not been tested on the Macintosh Quadra 700 and the Macintosh Quadra 900, and therefore cannot be listed as a possible configuration.The Macintosh Quadra 900 can also use 60ns SIMMs, but Orwell is programmed for 80ns DRAM, so a 60ns SIMM wouldn’t improve the speed. If one slot in a given bank is filled, then all slots in the bank must be populated. It is not possible to mix the speed of RAM, even between banks.The Orwell IC contains registers that the system software uses to set the starting address of each bank of memory. At startup time, the system software determines the sizes of the banks and assigns the bank starting addresses so that the banks occupy contiguous memory spaces, unlike that of the IIci and IIsi that have split memory maps. </span></text>
</content>
<name>tech8</name>
<script></script>
</card>
card_40601.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text><span class="style1">emory controller functions provide: • System 7.0 virtual memory• A/UX (Apple’s version of Unix) 3.0 capability (available early ‘92)• Large amounts of addressable DRAM Separate independently paged MMUs for instruction and data accesses have improved the memory management in the MC68040. The principle function of the MMUs is the translation of logical addresses to physical addresses using translation tables stored in memory. Each MMU stores recently used address mappings in a separate 64-entry ATC (Address Translation Cache). When the translation is not in the ATC, the processor searches in the translation tables in memory for the translation information. </span><span class="style2"></span><span class="style1">When the translation is resident in one of the ATCs, no processor time is taken up by the MMUs. No performance penalty is taken when the ATC is searching for information because the translation time is overlapped by other operations.</span></text>
</content>
<name>tech5</name>
<script></script>
</card>
card_19685.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text><span class="style3">uBus slots</span><span class="style1">The Macintosh Quadra 900 NuBus slots are different from those on the other modular Macintosh computers in three ways:• They provide higher power.• They can accommodate oversized NuBus cards (additional 2" in height).• They support some of the NuBus ’90 features.</span><span class="style12">Higher power</span><span class="style1"> The power supply in the Macintosh Quadra 900 computer is designed to provide additional current on the +5-V outputs for the NuBus slots, compared with the current specified in Designing Cards and Drivers for the Macintosh Family, second edition. The Macintosh Quadra 900 has enough power to support a total of two 25 watt cards and three 15 watt cards. </span><span class="style12">Oversized NuBus Cards</span><span class="style1">Each NuBus slot can accommodate either a standard NuBus card or an oversized card. The oversized card is the same length as a standard NuBus card, but it is 2 inches taller. Each NuBus slot in the Macintosh Quadra 900 computer includes a card guide; to install an oversized card, the user removes the card guide. </span><span class="style3">NuBus ’90 features</span><span class="style1">NuBus ’90 is the 1990 proposal for revision of the IEEE standard for the NuBus (IEEE STD R1196-R-1990). Apple has a representative on the panel designing the new standards, and has had since its inception. The specifications for NuBus ‘90 are incomplete, and are still under development, but Apple has implemented the portion of the specifications that are completed, and will be updating our implementation as the specs expand and stabilize. The NuBus slots in the Macintosh Quadra 900 computer provide the following new features described in that proposal: • Low current at +5 V is available on the new STDBYPWR pin when main power is off and the AC cord is plugged in.• New signals /TM2, /CLK2X, and /CLK2XEN support block transfers at double the standard rate (20 MHz). The Macintosh Quadra 900 computer allows double-rate block transfers between NuBus cards but does not support double-rate transfers to or from the main memory (this remains at 10 MHz). • NuBus ’90 defines new signals SB0 and SB1 for a serial bus on the formerly reserved pins A2 and C2. The serial-bus signals are bused and terminated, but the main circuit board does not drive them. • NuBus ’90 defines new signals /CM0, /CM1, /CM2, and /CBUSY to support a cache coherency protocol. Pins on the NuBus connector are assigned to those signals, but the Macintosh Quadra 900 system doesn’t support them. A single long word buffer allows pended writes from the motherboard to NuBus Cards.The table to the right lists the new signals described in the proposal for NuBus ’90.</span><span class="style28"></span><span class="style1">__________________________</span><span class="style23">Important:</span><span class="style1"> The eight lines that were connected to the –5.2 V supply in the original NuBus specification are now used for new features. Many older NuBus cards connect those eight lines together; the presence of such a card in a Macintosh Quadra 900 computer will disable the new features that use those lines. All other features of both old and new cards will operate normally.</span></text>
</content>
<content>
<layer>card</layer>
<id>4</id>
<text><span class="style1"></span><span class="style10"> NuBus ’90 signals on the Macintosh Quadra 900 NuBus connector </span><span class="style4">Pin # Signal Function nameA2 SB0† High-speed serial bus, defined in P1394 proposal.C2 SB1† High-speed serial bus, defined in P1394 proposal.B8 /TM2 New transfer mode: requests double-speed transfer.B9 /CM0† For cache-coherency operations.B10 /CM1† For cache-coherency operations.B11 /CM2† For cache-coherency operations.B24 /CLK2X Synchronizes double-speed block transfers.B25 STDBYPWR Small current at +5 V when main power is off; enables the card to turn main power on by asserting /PFW signal.B26 /CLK2XEN If not connected to other NuBus ’90 signals, this line enables /CLK2X driver.B27 /CBUSY Used with cache-coherency operations.†These signals are not driven or monitored by circuits in the Macintosh Quadra 900 computer.</span></text>
</content>
<name>tech5a</name>
<script></script>
</card>
card_54686.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text>In the Macintosh Quadra 900 computer, three chips comprise the interface between the system bus and the NuBus: the YANCC (Yet Another NuBus Controller Chip) IC and two 16-bit transceiver ICs that are the same as the ones in the Macintosh IIci. The YANCC IC maps certain system bus cycles to NuBus cycles and certain NuBus cycles to system bus cycles. The features of the YANCC IC include:• support for all types of single data transfers in either direction• a buffer, one long word deep, for appended writes from the MC68040 to the NuBus• support for block move transfers between NuBus masters and main memory• support for pseudo-block transfers between the MC68040 and NuBus slaves• support for some new functions defined in the NuBus ’90 specificationUnlike the NuBus controllers in previous Macintosh computers, the YANCC IC generates an interrupt when there is an error involving the write buffer. Software controls this interrupt by means of a control and status register in the YANCC. </text>
</content>
<name>tech9</name>
<script></script>
</card>
card_50088.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text>The power supply on the Macintosh Quadra 900 is a 300 Watt power supply, and adapts automatically to the AC voltage that is applied. The localization package for the computer will include the appropriate power cord for the destination country. The power supply includes a 120-mm (4.72-in.) fan that provides quiet cooling for the entire system. The power supply also includes a switched convenience receptacle to provide power for the monitor. The table shows the minimum, maximum, and peak ratings for the power supply. The output labeled +5V TRKL is a trickle supply that is available whenever the computer is plugged in. That output provides power for the parameter RAM and the power-on logic, along with standby power for the NuBus cards. The +12-V output is designed with a peak capacity high enough to meet the combined current demands made by all the peripheral devices turning on at the same time. </text>
</content>
<name>tech11</name>
<script></script>
</card>
card_56161.xml
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text>New technology...Processor Direct Slot</text>
</content>
<content>
<layer>background</layer>
<id>3</id>
<text><span class="style1">or maximum performance, the processor-direct slot (PDS) is connected directly to the MC68040 microprocessor by way of the system bus. Possible applications for a PDS expansion card include cache memory, a video frame buffer, a DMA-based I/O controller, expansion memory, or even an additional MC68040 microprocessor. When a PDS card is installed, slot E is unavailable for a NuBus card. A PDS card can have memory locations in the upper part of the RAM memory space or in the space assigned to NuBus slot $E. If the card uses slot $E addresses, it must decode all addresses in both the slot space and the super slot space, responding to any access to an unused location with a TEA on the processor bus to indicate an illegal address.A typical PDS card maps into the NuBus space and works with the system software’s Slot Manager. Such a card must contain a NuBus declaration ROM and must notify the NuBus controller that it is using the NuBus space by asserting (pulling low) the signal /PDS.SLOT.E.EN on the PDS connector. </span><span class="style3"></span><span class="style16">PDS card specifications</span><span class="style1">A PDS card for the Macintosh Quadra 900 computer has the same dimensions as a NuBus card and can include a back-panel connector. When the PDS card is installed, it occupies NuBus slot $E, reducing the number of available NuBus slots from five to four. The table of pinouts of the PDS connector is located in the Under The Hood section of this stack.__________________________</span><span class="style23">Important</span><span class="style1"> The signals on the PDS connector are connected directly to the MC68040 with no buffers. Therefore, the address, data, and clock lines on a PDS card must present capacitive loads of not more than 40 pF. The control lines must present capacitive loads of not more than 20 pF.  </span><span class="style2">A PDS expansion card for the Macintosh Quadra 900 computer must be designed to work with the MC68040 microprocessor; PDS cards designed for computers that use the MC68020 or the MC68030 will not work in the Macintosh Quadra 900 computer.  </span><span class="style1"></span></text>
</content>
<name>tech10</name>
<script></script>
</card>
card_48561.xml
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<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text><span class="style1">CSI throughput has been improved in the Macintosh Quadra 900 by 25-30% over the Macintosh IIci and IIfx by using a new SCSI controller; optimizing the bus design; and creating two SCSI channels:and internal and external. In the Macintosh Quadra 900, the SCSI bus is divided into internal and external buses, each controlled by its own identical IC, a NCR 53C96 device. The internal and external SCSI buses are logically connected through software, but electrically separate. The goal of this design was to develop a combination of controller, cabling, and termination for the internal SCSI devices which permits data transfer rates approaching the NCR 53C96 controller limit of 6 MB/sec. The cabling and termination of the internal SCSI bus are optimized so that the 53C96 that controls the internal bus can support data transfers at a faster rate—up to 5 MB/sec with existing faster third party hard drives. The improved SCSI performance will result in increased system responsiveness when accessing large amounts of data on a fast hard drive (e.g. - MicroNet drives or our new internal drives currently under development). (**Get more explicit information on internal SCSI termination, etc.) </span><span class="style2"></span><span class="style1">The internal SCSI channel also supports an active termination which improves SCSI bus signal quality and reliability through improved transmission line and terminator design. The external channel’s termination also offers a more uniform impedance and cleaner termination scheme, however, because external cabling and termination are less predictable, performance on the external bus could be lower than the internal. Electrically isolating the two channels insures that changes in external cabling and termination do not impact the performance of the internal devices.</span></text>
</content>
<name>tech12</name>
<script></script>
</card>
card_53738.xml
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<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text>The Macintosh Quadra 900 computer uses a new sound system. Its features are similar to the features of the sound interface in the Macintosh LC and the Macintosh IIsi. • Ability to record monophonic sound from microphone input, audio line inputs, or internal CD-ROM playback.• Ability to play sound from internal CD-ROM• Ability to play 8-bit sound files• ability to mix sound played from internal CD-ROM with sound from sound filesFour Apple custom ICs provide the sound interface.• DFAC, which provides sound input and an anti-aliasing filter • Batman, an updated version of the Apple Sound Chip• Sporty, a custom IC that replaces the two Sony sound ICs• external digital-to-analog converter (DAC) The DFAC (Digitally Filtered Audio Chip) is an Apple custom IC that is also used in the Macintosh LC. The DFAC IC includes the anti-aliasing filter and analog-to-digital converter (ADC) for sound input. It also contains a digital filter for conditioning output data before it is sent to the DAC. For sound output, an external DAC provides higher-quality sound than that generated by the PWM system used in earlier Macintosh models. The Sporty custom IC replaces the two Sony ICs used in earlier models and provides better sound quality: less noise and distortion. Like the Sony ICs it replaces, the Sporty IC also contains digital attenuators. A separate amplifier with power output of 2 watts drives the larger speaker used in the Macintosh Quadra 900 computer. </text>
</content>
<name>tech13</name>
<script></script>
</card>
card_46817.xml
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<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text><span class="style1">he built-in video hardware in the Macintosh Quadra 900 computer provides high-performance graphics on all current Macintosh monitors. The video hardware is built around a video frame buffer controlled by the DAFB (Direct Attach Frame Buffer) IC. The video frame buffer comprises four banks of video RAM (VRAM); the basic configuration has VRAM installed in two of the four banks. That configuration supports 8 bits per pixel on all Apple monitors (12-inch to 21-inch, monochrome and RGB) and on NTSC and PAL monitors, using Apple convolution. The basic configuration also supports VGA monitors. The basic VRAM configuration supports 24 bits per pixel on the 12-inch RGB monitor. By installing VRAM SIMMs into the other two banks, the user can expand the frame buffer to support 24 bits per pixel for the 13-inch monitor. The video hardware in the Macintosh Quadra 900 computer provides graphics performance approaching that of the Macintosh Display Card 8•24 GC. That card is still faster for certain graphics operations, but not all applications benefit from the acceleration it provides. Because the frame buffer in the Macintosh Quadra 900 computer is connected directly to the system bus, it speeds up all applications, even those that don’t use QuickDraw™. The control registers in the DAFB IC and the frame-buffer VRAM are mapped into the memory locations that were assigned to NuBus slot $9 in earlier models. The VRAM used in the Macintosh Quadra 900 is the same 256 kbytes SIMMs as in the Macintosh LC. The Macintosh Quadra 900 comes standard with 1MB (2 banks) soldered onto the board, which is enough to support up to 8-bits per pixel on Apple monitors from 12” to 16”, mono and RGB, and up to 4-bits on the larger monitors such as the 15” portrait and 21” color. When upgraded to 2Mb (all 4 banks populated), there is support for 24-bits per pixel on almost all monitors with the exception of the 21” color, 15” portrait, NTSC and PAL. Apple will provide a video RAM upgrade kit consisting of 2 SIMMs of 256 kbytes. Apple is currently evangelizing third party VRAM, but it won’t be available at intro.</span><span class="style2">____________________________</span><span class="style18">Definition of Convolution: </span><span class="style17"></span><span class="style1">The 8•24 video card introduced in 1990 addressed the problem of screen flicker by implementing a new way of pixel averaging called </span><span class="style3">Convolution</span><span class="style1">. Convolution runs every pixel through a formula that averages the pixel with its individual neighboring pixels above and below, and it is part of the function of the CLUT/DAC chip on Display Card 8•24. Convolution causes a blurring effect between scan lines so that a horizontal line includes at least a portion of the scan lines above and below its own scan line. A portion of the horizontal line remains visible during display of both the odd and even fields so flicker is avoided. The convolution formula follows a 1:2:1 ratio where the current pixel value is given twice the weight of its neighbors above and below. Convolution is automatically turned on where appropriate. If the on-board video on the Macintosh Quadra 900 is driving an interlace display in 24-bit mode, convolution is disabled. If the card is driving an interlace display in 8-bit, or a lesser pixel depth, convolution is enabled.</span><span class="style2"></span></text>
</content>
<name>tech14</name>
<script></script>
</card>
card_10593.xml
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<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text><span class="style4"> full features and benefits document had not been finalized in time for this mastering. This information can be obtained from the sales and marketing literature available for the Macintosh Quadra 900 at or prior to the introduction date.</span></text>
</content>
<name>mktng</name>
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</card>
card_7221.xml
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<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
<text><span class="style5">onfigurations</span><span class="style4">There are two configurations that will be announced at introduction:M0000LL/A 4M MB Macintosh Quadra 900 with an internal floppy disk drive only M0000LL/A 4M/160 MB Macintosh Quadra 900 with an internal floppy disk driveThese are the optional accessories available from Apple:M0000LL/A Internal 80 MB Hard Drive M0000LL/A Internal 160 MB Hard DriveM0000LL/A SCSI CD Plus DriveM0000LL/A 1 MB RAM Expansion KitM0000LL/A 4 MB RAM Expansion Kit </span></text>
</content>
<name></name>
<script></script>
</card>
card_24177.xml
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<!DOCTYPE card PUBLIC "-//Apple, Inc.//DTD card V 2.0//EN" "" >
 (January 1994).bin/Files/Apple/Quadra 900 Tech Tour.cpt/Quadra 900 Tech Tour/Quadra 900 Tech Tour/BMAP_9742.png){kind=link}
 (January 1994).bin/Files/Apple/Quadra 900 Tech Tour.cpt/Quadra 900 Tech Tour/Quadra 900 Tech Tour/PATs.png){kind=link}