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-
- Macintosh Quadra 840AV and Macintosh Centris 660AV
- July 29, 1993
-
- Prepared by Noah Price, Hardware Design Team (noah@apple.com)
- Contributions from Fernando Urbina, Software Team (nano@apple.com)
-
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- Comparison of AV models
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-
- Macintosh Macintosh
- Centris 660AV Quadra 840AV
- ====================== ======================
- Enclosure Same as Centris 610 Same as Quadra 800
-
- Processors
- ----------
- CPU Motorola MC68040RC Motorola MC68040RC
- CPU Speed 25 MHz 40 MHz
- Hardware Floating Point Included Included
- DSP AT&T DSP3210 AT&T DSP3210
- DSP Speed 55.5 MHz 66.6667 MHz
-
- Main Memory
- -----------
- Onboard DRAM 4 MBytes none
- Expansion DRAM SIMMs Two 72-pin SIMMs (1) Four 72-pin SIMMs (1)
- Maximum DRAM capacity 68 MBytes 128 MBytes
- Expansion DRAM Speed 70 ns 60 ns
-
- Video & Graphics
- ----------------
- Onboard VRAM 1 MB 1 MB
- Expansion VRAM SIMMs none 1 MB (Four 256K SIMMs)
- Expansion VRAM Speed n/a 80 ns
-
- Expansion
- ---------
- NuBus 1 slot (2) 3 slots
- DAV (3) 1 connector (2) 1 connector
-
- Power
- -----
- Power Supply 85 W 200 W
- Trickle Power none Yes (4)
- Power Control Hard power Soft power (5)
- Monitor Outlet Unswitched Switched
-
-
- NOTES:
-
- (1) Both models use 32-bit wide 72-pin SIMMs. For electrical loading
- and timing reasons, composite SIMMs are not supported.
-
- (2) The NuBus slot and DAV connector are optional on the Centris 660AV.
- A NuBus adapter card, similar to the adapter for the Centris 610,
- must be added. This card provides a single NuBus slot in line
- with a DAV connector. Like the Centris 610, the Centris 660AV is
- designed to accomodate a 7" NuBus card.
-
- (3) DAV - Digital Audio Video connector. The DAV connector is in line
- with a NuBus slot, and provides digital video in YUV format and
- digital audio.
-
- (4) Trickle Power is a +5V supply that is present whenever the
- computer is plugged in. When available, it is automatically used
- instead of the battery to maintain parameter RAM. Trickle power
- is also provided to NuBus, per NuBus 90, and to GeoPort for use in
- an external telephone interface.
-
- (5) Soft power control has been enhanced. The Quadra 840AV may be
- turned on or off from either the keyboard power switch (which puts
- up a confirmation dialog before shutting down) or the front panel
- switch. Software control of on/off features is now available in
- the "Auto Power On/Off" control panel. This includes
- automatically turning the computer on or off at a specified time,
- and automatically powering back on after a power failure.
-
-
- ------------------------------------------------------------------------
- I/O Features Overview
- ------------------------------------------------------------------------
-
- Both AV models support Direct Memory Access (DMA). Serial (including
- LocalTalk and GeoPort), 53C94 SCSI, Ethernet, floppy, and audio are
- all supported with DMA drivers.
-
- The version 4.3 SCSI Manager supports fully asynchronous SCSI
- transactions with extensions to the Applications Programmer Interface
- (API). A new SCSI driver is required on the hard drive for full
- performance benefits. This driver may be installed on existing Apple
- SCSI hard drives using the new HD SC Setup.
-
-
- ------------------------------------------------------------------------
- Audio Features Overview
- ------------------------------------------------------------------------
-
- Both AV models support 16-bit Stereo audio input and output. Hardware
- sample rates include 48 KHz and CD standard 44.1 KHz.
-
- Output Port Mini-stereo jack, line level
- Input port Mini-stereo jack (plus power), line level
- Internal CD Audio 4-pin stereo header
-
-
- ------------------------------------------------------------------------
- Video Features Overview
- ------------------------------------------------------------------------
-
- Video Output RGB (DB-15 connector)
- Composite (RCA connector)
- S-Video (4-pin mini-DIN connector)
- Video Output Formats RGB, NTSC or PAL
- ("SECAM" TVs can be supported with an adapter
- on the RGB output using PAL timing.)
- NTSC/PAL "Flicker Free" Yes (up to 8 bpp, without video-in)
- (Convolution)
-
- Video Input Composite (RCA connector)
- S-Video (7-pin mini-DIN with power and IIC
- control, compatible with 4-pin mini-DIN)
- Video Input Formats NTSC, PAL or SECAM
-
- Largest Monitor 21" (1152 x 870)
- Max Graphics Bit Depth 32 bits/pixel (see details per model below)
- Video Play-through
- Bit Depths 8 bits/pixel greyscale or 16 bits/pixel color
-
-
- ------------------------------------------------------------------------
- Video Output Display Support
- ------------------------------------------------------------------------
-
- The AV models support a wide range of monitors. The built-in monitor
- support is detailed in the table below. For the AV models, video-in
- refers live video from one of the input jacks, video out refers to
- live video playthrough, and graphics refers to traditional Macintosh
- generated video output (windows, desktop, etc.).
-
- To accomodate displaying live video in a window with graphics, both
- models have a split frame buffer architecture. Video-in uses one-half
- of the video memory and graphics uses the other half. To achieve the
- highest graphics bit depth, the two halves are often used together for
- graphics. Consequently, for many monitors video-in is not available
- when displaying graphics at the highest bit depth. When displaying
- live video, the two frame buffers are merged so the video-input
- appears as a window on the graphics display.
-
- Note that the bit depth for graphics may be different than the bit depth
- for video. For example, on the 13" or 14" RGB display, you can display
- up to 8-bit graphics when video-in is enabled. However, you can view a
- 16-bit video input window on this display at the same time.
-
- The machines can drive an NTSC or PAL monitor directly, without the use
- of an encoder box. In order for that feature to be enabled, the
- display resolution should be either 512x384 or 640x480 for NTSC, or
- 640x480 or 768x576 for PAL. Hence the different resolutions available
- for each display.
-
- Notes:
-
- 1) The Macintosh Centris 660AV always has 1 MByte of VRAM.
-
- 2) The Macintosh Quadra 840AV comes standard with 1 MByte of VRAM
- and may be expanded to 2 MBytes of VRAM. Four 80 ns 256K VRAM
- SIMMs are required.
-
- 3) Where multiple resolutions are available, an asterisk (*) indicates
- the standard resolution. Additional resolutions allow you to
- display more colors by only using a portion of the monitor.
- Select the resolution by using the Options dialog of the Monitors
- Control Panel. You must reboot to change resolutions. The size
- of the pixels will not change in these alternate modes. Instead,
- a black border will appear around the smaller active video area.
-
- 4) A "Flicker-free" mode (sometimes referred to as Apple
- Convolution) is available when displaying on a TV. This mode is
- available at up to 8 bits/pixel and is not available when using
- video-in.
-
- 5) bpp is Bits Per Pixel. A range is given in table below, indicating
- which of the following are available:
-
- 1 bpp - Black & White
- 2 bpp - 4 colors or greys
- 4 bpp - 16 colors or greys
- 8 bpp - 256 colors or greys (greys only for Video in)
- 16 bpp - Thousands of colors (5 bits each of R, G, and B)
- 32 bpp - Millions of colors (8 bits each of R, G, and B)
-
- 6) Both the video and graphics portions of VRAM are often used
- together to display graphics at the highest available bit depth.
- In the table below, the range of graphics bit depths is marked
- with # when video-in is available at the maximum graphics bit
- depth. In all other cases video-in is not available when using
- the highest graphics bit depth.
-
- ------------------------------------------------------------------------
- 1 MByte VRAM 2 MByte VRAM
- ================== ==================
- Graphics Video-in Graphics Video-in
- Display Resolution bpp bpp bpp bpp
- ----------------- ---------- -------- -------- -------- --------
-
- 12" RGB 512x384* 1-32 8-16 1-32 8-16
- 560x384 1-32 8-16 1-32 8-16
-
- 13" or 14" RGB 512x384 1-32 8-16 1-32 8-16
- & 12" Monochrome 640x400 1-32 8-16 1-32 8-16
- 640x480* 1-16 8-16 1-32 8-16
-
- 15" Portrait 512x384 1-8# 8-16 1-8# 8-16
- Full-Page Monochrome 640x480 1-8# 8-16 1-8# 8-16
- 640x870* 1-8 8-16 1-8# 8-16
-
- 15" Portrait 640x870* 1-8 8-16 1-16 8-16
- Full-Page RGB
-
- 16" RGB 512x384 1-32 8-16 1-32 8-16
- 640x480 1-16 8-16 1-32 8-16
- 768x576 1-16 8-16 1-32 8-16
- 832x624* 1-16 8-16 1-32 8-16
-
- 19" RGB 1024x768* 1-8 8 1-16 8
-
- 21" Two-Page 512x384 1-8# 8 1-8# 8
- Monochrome 640x480 1-8# 8 1-8# 8
- 768x576 1-4# 8 1-4# 8
- 1152x870* 1-8 8 1-8# 8
-
- 21" Two Page RGB 512x384 1-16 8 1-16 8
- 640x480 1-16 8 1-16 8
- 768x576 1-4# 8 1-4# 8
- 1152x870* 1-8 8 1-16 8
-
- VGA/SVGA Displays 640x480* 1-16 8-16 1-32 8-16
- 56Hz 800x600 1-16 8-16 1-32 8-16
- 72Hz 800x600 1-16 8-16 1-32 8-16
- 60Hz 1024x768 1-8 8 1-16 8
- 70Hz 1024x768 1-8 8 1-16 8
-
- Composite and S-Video Output Modes:
-
- NTSC convolved (flicker-free mode)
- Underscan (Safetitle) 512x384 1-8 NA 1-8 NA
- Overscan (Fullframe) 640x480* 1-8 NA 1-8 NA
-
- NTSC non-convolved
- Underscan (Safetitle) 512x384 1-32 8-16 1-32 8-16
- Overscan (Fullframe) 640x480* 1-16 8-16 1-32 8-16
-
- PAL convolved (flicker-free mode)
- Underscan (Safetitle) 640x480 1-8 NA 1-8 NA
- Overscan (Fullframe) 768x576* 1-8 NA 1-8 NA
-
- PAL non-convolved
- Underscan (Safetitle) 640x480 1-16 8-16 1-32 8-16
- Overscan (Fullframe) 768x576* 1-16 8-16 1-32 8-16
-
-
- * Default resolution. See note 3 above.
- # Video-in is availble at the highest graphics bit depth.
- See note 6 above.
-
-
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- Comments
- ------------------------------------------------------------------------
-
- Please refer comments about this document to Noah Price at one of the
- following electronic addresses, listed in order of preference (that
- is, how frequently they're checked!).
-
- Internet............ noah@apple.com
- AppleLink........... NOAH.P
- America Online...... NoahPrice
- CompuServe.......... 72040,355
- GEnie............... NOAH.P
-
- Please understand that I may not be able to respond to everyone
- individually. However, comments or questions may be incorporated in
- future revisions.
-
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