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Contents
Figures and Tablesv
Preface About This Notevii
Contents of This Notevii
Supplementary Documentsvii
For More Informationviii
Conventions and Abbreviationsviii
Typographical Conventionsviii
Special Elementsix
Standard Abbreviationsix
Chapter 1 Introduction1
Chapter 2 PowerBook Duo Dock II Hardware3
PowerBook Duo Dock II Enclosure4
Main Logic Board6
Memory Mapping9
Hard Disk Drive11
Internal SCSI Connector12
Video Support13
Power Supply15
Network Support16
Chapter 3 PowerBook Duo Dock II Software19
Declaration ROM20
Sleep State20
Index21
Figures and Tables
Chapter 2 PowerBook Duo Dock II Hardware3
Figure 2-1 Front view of the PowerBook Duo Dock II4
Figure 2-2 Outline of the PowerBook Duo Dock II main logic board7
Figure 2-3 Block diagram of PowerBook Duo Dock II functions8
Figure 2-5 Memory map of I/O space accessible in 32-bit mode10
Figure 2-6 Memory map of I/O space accessible in 24-bit mode10
Figure 2-7 Hard disk drive cabling11
Figure 2-8 Rear view of PowerBook Duo Dock II 16
Figure 2-9 The 14-pin Ethernet connector16
Table 2-1 Enclosure dimensions and weight5
Table 2-2 Hard disk drive power specifications11
Table 2-3 Internal SCSI connector signal assignments12
Table 2-4 Displays supported by the PowerBook Duo Dock II14
Table 2-5 DC output currents and power15
Table 2-6 DC output voltage cross-regulation limits15
Table 2-7 Ethernet connector signal assignments17
About This Note
This note is a supplement to the Macintosh Developer Notes, Number 2: Macintosh Duo System, APDA publication number R0457LL/A. It describes the design features of the PowerBook Duo Dock II, a docking station that provides PowerBook Duo portable computers with the capabilities of a desktop computer.
The note provides the hardware or software developer with additional infor-
mation needed to design hardware and software elements for the PowerBook Duo Dock II. This publication assumes you are familiar with the functionality and programming requirements for Apple Macintosh computers.
Contents of This Note
The information is arranged in three chapters and an index:
n Chapter 1, “Introduction,” gives a summary of the features of the PowerBook Duo Dock II.
n Chapter 2, “PowerBook Duo Dock II Hardware,” describes the hardware modifications that make the PowerBook Duo Dock II different from the original Macintosh Duo Dock.
n Chapter 3, “PowerBook Duo Dock II Software,” describes the software modifications that were made to support the new features of the PowerBook Duo Dock II.
Supplementary Documents
The following documents provide information that complements or extends the information in this developer note.
n Macintosh Developer Notes, Number 2: Macintosh Duo System, APDA publication number R0457LL/A
n Designing Cards and Drivers for the Macintosh Family, third edition.
For More Information
APDA is Apple’s worldwide source for over three hundred development tools, technical resources, training products, and information for anyone interested in developing applications on Apple platforms. Customers receive the quarterly APDA Tools Catalog featuring all current versions of Apple development tools and the most popular third-party development tools. Ordering is easy; there are no membership fees, and application forms are
not required for most of our products. APDA offers convenient payment and shipping options, including site licensing.
To order products or to request a complimentary copy of the APDA Tools Catalog, contact
APDA
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Conventions and Abbreviations
This developer note uses the following typographical conventions and abbreviations.
Typographical Conventions
A distinction is made between boards and cards. Boards are a permanent part of the PowerBook Duo Dock II, for example the main logic board. Cards may be inserted into the system and can be added or exchanged.
Hexadecimal numbers are preceded by a dollar sign ($). For example, the hexadecimal equivalent of decimal 16 is written as $10.
Special Elements
This developer note has two kinds of special paragraphs: Note and Important.
Note
A note like this contains information that is interesting but not essential for an understanding of the text.u
IMPORTANT
A note like this contains important information that you should read before proceeding.s
Standard Abbreviations
When unusual abbreviations appear in this book, the corresponding terms are also spelled out. Standard units of measure and other widely used abbreviations are not spelled out. Here are the standard units of measure used in Apple developer notes:A amperes kg kilograms
dB decibels kHz kilohertz
Hz hertz kΩ kilohms
in. inches lb. pounds
K 1024 mA milliamperes
KB kilobytes µA microamperes
MB megabytes µs microseconds
Mbit megabits sec. seconds
MHz megahertz V volts
min. minutes W watts
mm millimeters Ω ohms
ms milliseconds
$n hexadecimal value n
AC alternating current
ADB Apple Desktop Bus
AM active matrix
AUI auxiliary unit interface
bpp bits per pixel
CLUT color lookup table
CPU central processing unit
DAA data access adapter
DAC digital-to-analog converter
DC direct current
DMA direct memory access
DRAM dynamic RAM
DRQ data request
DSACK data transfer and size acknowledge
ENet Ethernet
FPU floating-point unit
IC integrated circuit
ID identification
I/O input/output
MUX multiplex
RAM random-access memory
RGB red-green-blue
rms root mean square
SCC Serial Communications Controller
SCSI Small Computer System Interface
SRAM static RAM
SVGA super video graphics array
SWIM Super Woz Integrated Machine (a custom IC that controls the floppy disk interface)
VDAC video digital-to-analog converter
VGA video graphics array
VRAM video RAM
Here are other abbreviations used in this developer note:
Introduction
The PowerBook Duo Dock II is an enhanced version of the original Duo Dock providing the docking capability that turns PowerBook Duo computers into fully functional desktop computers. It is completely compatible with the Macintosh Duo System and can accommodate existing PowerBook Duo computers. At the same time, it provides new features that improve performance and expandibility of the PowerBook Duo computers. For example, the PowerBook Duo Dock II main logic board includes built-in support for both Ethernet and 21-inch video displays. The original Duo Dock required NuBus™ cards to support these functions. By providing these features on the main logic board, the NuBus slots are freed up for other uses.
Features of the PowerBook Duo Dock II are listed below. Most of these features are discussed in detail in Part Three, “Macintosh Duo Dock,” of Macintosh Developer Notes, Number 2. Those features that are new, and different from the original Duo Dock are described in more detail later in Chapters 2 and 3 of this note.
n Macintosh I/O: external HDI-30 SCSI connector, mini-DIN 4 ADB connector for mouse or external keyboard, two serial communication ports for modem and printer, monaural sound input and output, on/off switch
n built-in speaker
n 152-pin connector that connects to the PowerBook Duo’s interface connector
n internal 1.4 MB Apple SuperDrive floppy disk drive, with auto-insert and auto-eject mechanism
n internal 50-pin SCSI connector for optional hard disk drive
n integral bay for optional 3.5-inch hard disk drive
n video port for external monitor: supports 12- to 16-inch displays at 16 bits per pixel; supports 21-inch displays at 8 bits per pixel
n VGA and SVGA support for color monitors
n 1 MB of VRAM standard for 16-bit video capability
n NuBus adapter card with slots for two full-sized 15 W NuBus card, or one 25 W card
n standard onboard FPU
n modified cover that supports up to 85-pound monitors
n larger CPU slot to accommodate taller versions of the PowerBook Duo computer
n 32 KB of direct-mapped CPU cache SRAM memory
n built-in Ethernet connector and supporting 33 MHz Sonic Ethernet master
n PowerLatch technology
n security key to lock the PowerBook Duo computer in the Duo Dock
n 75 W power supply with switched AC outlet for monitor power
n modem adapter card to connect the PowerBook Duo modem to a phone line
Chapter 2, “PowerBook Duo Dock II Hardware,” describes the new features of the PowerBook Duo Dock II that make it different from the original Duo Dock. Chapter 3, “PowerBook Duo Dock II Software,” describes the software differences between the
two machines.
PowerBook Duo Dock II Hardware
This chapter describes hardware modifications and new features that make the PowerBook Duo Dock II different from the original Macintosh Duo Dock. These modifications and features include
n enclosure changes
n standard onboard FPU
n standard 1 MB VRAM that supports 8-bit and 16-bit video capabilities
n 32-bit video pixel bus
n 32 KB SRAM cache for improved performance
n onboard Ethernet capability with Apple AUI
Features common to both the PowerBook Duo Dock II and the original Macintosh Duo Dock are described in Part Three, “Macintosh Duo Dock,” of Macintosh Developer Notes Number 2.
PowerBook Duo Dock II Enclosure
The PowerBook Duo Dock II enclosure looks basically the same as the original Duo Dock enclosure; however, the following changes have been made in the design:
n Height of the top cover has been increased 9 mm to accommodate future PowerBook models that are slightly thicker because of AM displays.
n A tracking mechanism in the top cover enables original PowerBook Duo computers to be reliably docked in the PowerBook Duo Dock II.
n A protective door covers the front slot.
n Housing has been reinforced to stand the weight of an 85-pound 21-inch monitor.
n Venting of the enclosure has been modified to improve airflow around NuBus cards.
Figure 2-1 shows a front view of the PowerBook Duo Dock II.
Figure 2-1 Front view of the PowerBook Duo Dock II
The increased height of the top cover makes the PowerBook Duo Dock II 9 mm (0.35 inch) taller than the standard Macintosh Duo Dock. As a result, there is a larger vertical opening (slot) that allows docking of future PowerBook models that that are slightly thicker than earlier models because of their active matrix screens. Enclosure specifica-
tions are listed in Table 2-1.
Table 2-1 Enclosure dimensions and weight
Specification Measurements (inches or pounds) Measurements
(mm or kg)
Depth 16.37 inches 415.6 mm
Width 12.75 inches 323.8 mm
Height 6.22 inches 158 mm
Width of CPU opening 10.90 inches 277 mm
Height of CPU opening 1.89 inches 48 mm
Weight without hard disk 13.60 pounds 6.17 kg
Weight with hard disk 15.20 pounds 6.9 kg
Guide arms underneath the top cover act as a tracking mechanism to ensure reliable docking of different size PowerBook Duo computers. This feature lets you use the PowerBook Duo Dock II with the older PowerBook Duo computers, which are slightly thinner than some newer versions that have active matrix displays. The mechanism engages the upper-right and upper-left corners of the CPU housing and prevents the CPU from missing the inject motor alignment pins.
A door over the CPU slot, in the front of the enclosure, gives the Power Duo Dock II a more streamlined look and serves as a visually distinguishes the PowerBook Duo Dock II from the original Macintosh Duo Dock.
IMPORTANT
Although you can use earlier PowerBook Duo computers with the PowerBook Duo Dock II, you cannot insert certain later models of the PowerBook Duo computer into the original Macintosh Duo Dock unless you obtain an upgrade kit for the original Duo Dock enclosure.s
Internal support bars inside the enclosure have been redesigned to support the weight of heavier and larger monitors. The PowerBook Duo Dock II can support from 13-inch to 21-inch monitors weighing up to 85 pounds.
Air is drawn into the enclosure through three sets of vents: one on the bottom of the enclosure in the front right corner, one on the rear panel in the left corner, and one on the left panel in the front corner. Air is exhausted through a vent on the right side of the enclosure in the rear corner. This method of routing the airflow through the PowerBook Duo Dock II provides improved ventilation for any NuBus cards that are mounted in the NuBus slots, which are located at the right side of the enclosure.
IMPORTANT
IMPORTANT
The spatial orientation of the PowerBook Duo Dock II assumes that you are standing in front of the unit. The panel designated the right panel is the one on your right as you face the unit. The left panel is the one on your left.s
Main Logic Board
Except for the front-to-back length, which has been increased by 1 mm, the PowerBook Duo Dock II main logic board has the same dimensions and outline as the Macintosh Duo Dock main logic board. However, there are some changes in the component configuration. Figure 2-2 shows the outline of the board with dimensions. The items that differ are
n a new custom IC that controls I/O, cache, floppy disk drives, and Apple AUI
n Ethernet connector
n SRAMs used for direct-mapped cache
n 1 MB of standard VRAM (no expansion VRAM slot)
n standard FPU
n 100 MHz video CLUT DAC
n smaller NuBus transceivers
These features are described later in this chapter.
Figure 2-3 shows a block diagram of the main logic board functions.
Figure 2-2 Outline of the PowerBook Duo Dock II main logic board
Figure 2-3 Block diagram of PowerBook Duo Dock II functions
Memory Mapping
Memory mapping for the PowerBook Duo Dock II has been modified to accommodate additional features, such as Ethernet support. Addresses for the pseudo-NuBus expansion space (see Figure 2-4) have not changed. They are assigned as follows:
n Addresses $FEE0 0000 through $FEF0 0000 are assigned to I/O space accessible in 32-bit mode (see Figure 2-5).
n Addresses $FE00 0000 though $FE10 0000 are assigned to I/O space accessible in 24-bit mode (see Figure 2-6).
Figure 2-4 Pseudo-NuBus expansion slot memory map
Figure 2-5 shows the addresses assigned to I/O space accessible in 32-bit mode.
Figure 2-5 Memory map of I/O space accessible in 32-bit mode
Figure 2-6 shows the addresses assigned to I/O space accessible in 24-bit mode.
Figure 2-6 Memory map of I/O space accessible in 24-bit mode
Hard Disk Drive
The PowerBook Duo Dock II includes physical space to accommodate a 1/3 high (1 inch) hard disk drive, with a 50-pin SCSI interface and a 4-pin power connector. If a third party is installing a hard disk drive in the PowerBook Duo Dock II, it is also up to the third party to provide the appropriate SCSI cable to connect the drive to the SCSI internal connector shown in Figure 2-2. The cable is a 50-wire ribbon cable, with a 50-pin connector at each end. Figure 2-7 shows the cable with the relative position of pin 1. The pin assignments and signal descriptions for the connector are provided in the next section of this chapter.
Figure 2-7 Hard disk drive cabling
Table 2-2 lists the power available for the hard disk drive upgrade
Table 2-2 Hard disk drive power specifications
Current Voltage
700 mA +5 V no surge
300 mA +12 V steady state
NOTE1.0 A additional on +12 V for a surge duration of 8 seconds
Internal SCSI Connector
The PowerBook Duo Dock II provides an internal SCSI connector for a third-party hard disk drive. The 50-pin SCSI connector is mounted on the main logic board and connects to the internal hard disk by means of the custom cable described in the previous section. If an internal hard disk drive is not installed, an active terminator plug is inserted in the SCSI connector to provide termination for the Duo Dock II side of the SCSI bus. Table 2-3 shows the pin assignments and signal descriptions for the internal connector.
Note
Inputs (I) and outputs (O) are referenced to the PowerBook Duo computer. For example, /SEL is output by the computer to the hard disk drive. When the computer drives /SEL low, it selects the related hard disk (or other SCSI device).u
Table 2-3 Internal SCSI connector signal assignments(continued)
26 TERM PWR +5 V power for the terminating resistors
32 /ATN I When active (low), indicates a SCSI attention condition
36 /BSY I When active (low), indicates the SCSI data bus is busy
continued
38 /ACKS I Handshake signal; when low, acknowledges a request for data transfer
40 /RST O SCSI bus reset
42 /MSG I Indicates the SCSI message phase
44 /SEL O Driven low to select a SCSI device (hard disk)
46 /C/D O When low, indicates that data is on the SCSI bus; when high, indicates that control signals are on the bus
48 /REQ O Request for a data transfer
50 /I/O O Controls the direction of data flow; when low, data is output from the computer to the disk drive; when high, data is input to the computer from the disk drive
Note
Note
The HDI-30-pin connector located on the edge of the main
logic board is the external SCSI port for the PowerBook Duo Dock II
(see Figure 2-2). It is described in Chapter 14, “Macintosh Duo Dock Hardware,” of Macintosh Developer Notes, Number 2.u
Video Support
Unlike the original Macintosh Duo Dock, the PowerBook Duo Dock II has 1 MB of VRAM built into the main logic board. The VRAM consists of four 256K x 8-bit VRAM devices, with an access speed of 80 ns or less. The position of the VRAM on the board is shown in Figure 2-2, earlier in this section.
Since the video hardware can support dot clocks of up to 100 MHz, the PowerBook Duo Dock II can support new 19- and 21-inch displays that cannot be supported by the original Macintosh Duo Dock. In general, the PowerBook Duo Dock II provides the same level of display support as is provided by the Macintosh Quadra 950, Macintosh Centris 610 and 650, and the Macintosh Quadra 800. Table 2-4 lists all the displays supported by the PowerBook Duo Dock II. The additional displays are shown in boldface.
Table 2-4 Displays supported by the PowerBook Duo Dock II(continued)
Display Resolution
(horizontal x vertical) Bits per pixel (bpp)
12” RGB 512 x 384 1–16 bpp
12” monochrome 640 x 480 1–16 bpp
13” and 14” RGB 640 x 480 1–16 bpp
VGA 640 x 480 1–16 bpp
Super VGA (56 Hz) 800 x 600 1–16 bpp
Portrait 640 x 870 1–8 bpp
15” RGB 640 x 870 1–8 bpp
16” RGB 832 x 624 1–16 bpp
19” RGB 1024 x 768 1–8 bpp
Two-page 1152 x 870 1–8 bpp
21” RGB 1152 x 870 1–8 bpp
An added feature of The PowerBook Duo Dock II video system is programmable sync-on-green. If the unit senses that a VGA or super VGA monitor is connected, the sync-on-green signal is disabled (default condition) so that the green channel will not include video sync information. This prevents the “green tint” that can occur on VGA and super VGA monitors. The sync-on-green signal is automatically enabled when a non-VGA monitor is connected.
Power Supply
The PowerBook Duo Dock II power supply was designed specifically for this docking station. It provides the same DC voltages as the power supply used in the original PowerBook Duo and described in Chapter 14, “Macintosh Duo Dock Hardware,” of Macintosh Developer Notes, Number 2. However, some of the electrical specifications are slightly different, and they are defined in this section. Table 2-5 summarizes DC output currents and power requirements.
Table 2-5 DC output currents and power(continued)
Load condition +5 V +12 V –12 V +19 V Total power
Minimum load 0.5 A 0.00 A 0 mA 0.00 A 2.50 W
Maximum load 8.36 A 1.24 A 0.30 A 1.00 A 79.28 W
Peak load 8.36 A 2.24 A 0.30 A 1.00 A 87.68 W
Peak load 0.00 A 0.00 A 0.00 A 1.40 A 26.60 W
Table 2-6 lists DC voltage cross-regulation limits.
Table 2-6 DC output voltage cross-regulation limits
Condition +5 V +12 V –12 V +19 V Unit
Minimum +4.85 +11.40 –10.80 +18.00 VDC
Maximum ≤+5.25 ≤+12.8 ≤–13.20 ≤21.00 VDC
Network Support
The PowerBook Duo Dock II has built-in support for the Ethernet high-speed, local area network system, in the form of a built-in EtherTalk port. The Ethernet connector is an Apple AUI connector. It accepts Apple Ethernet adapters, which provide transceivers for thick net, thin net, and 10BaseT cables. Figure 2-8 shows the rear panel of the PowerBook Duo Dock II, with the Ethernet connector.
Figure 2-8 Rear view of PowerBook Duo Dock II
Figure 2-9 shows details of the Ethernet connector.
Figure 2-9 The 14-pin Ethernet connector
Table 2-7 lists the pin assignments for the Ethernet connector and provides signal descriptions.
Table 2-7 Ethernet connector signal assignments(continued)
Pin number Signal name I/O Description
1, 7, 8, 14 AUI+5V I +% V power
2 RX+EXT I Receive data positive
3 RX EXT I Receive data negative
4, 11 GND — Ground
5 CD+EXT O Carrier detect positive
6 CD EXT O Carrier detect negative
9 TX+EXT O Transmit data positive
10 TX EXT O Transmit data negative
12, 13 No connection — Open line
NOTEIn Table 2-7, I indicates an incoming signal (to the Duo Dock II) and O indicates an outgoing signal (from the Duo Dock II).
PowerBook Duo Dock II Software
The PowerBook Duo Dock II software has been upgraded to support a variety of additional features that were not supported by the original Macintosh Duo Dock software. The built-in video software now supports extended video capabilities. The video features supported are described in Chapter 2 of this note, under “Video Support.” The software also supports the built-in Ethernet capability, with the Apple AUI , as well as providing unified processor cache support.
Declaration ROM
The declaration ROM used in the original Macintosh Duo Dock has been extensively modified to support the enhanced video capabilities of the PowerBook Duo Dock II.
n Support was added support to remove the ‘scrn’ resource for family-mode switches. This fixes the problem in which switching from VGA to SVGA causes the screen to go back to 1 bpp the next time the system is booted.
n The ‘scrn’ resource is now updated to reflect the current state of Slot parameter RAM instead of deleting it.
n Code has been added to the PowerBook Duo Dock II video driver that installs a Time Manager task during dimming. This allows the screen to be activated again merely by moving the mouse.
n New CLUT DAC and associated circuit that enables the sync-on-green signal. The PowerBook Duo Dock II also supports toggling for the sync-on-green signal.
Sleep State
Currently, the system software does not allow a docked PowerBook Duo computer to go to sleep. However, the PowerBook Duo Dock II hardware is set up to accept a sleep state should any future PowerBook Duo computers support sleep docking.
Index
A, B
airflow5
AUI connector16
C
compatibility5
configuration ROM20
conventions used in bookviii
cover, CPU slot5
D
DC output voltage15
DC power requirements15
displays supported14
E
Ethernet16
connector16
signal assignments17
EtherTalk16
external SCSI port13
F, G
features2
H
hard disk drive11
hard disk drive, cabling11
hardware modifications4
housing, front view4
housing, rear view16
I, J, K, L
internal hard disk drive11
M
main logic board6–7
memory mapping9–10
modifications, hardware4
modifications, software20
monitors supported14
monitor support, hardware5
N
network support16
O
output voltage, DC15
P, Q
power requirements, DC15
power supply15
pseudo-NuBus9
R
reference materialvii
related documentationvii
ROM, configuration20
S
SCSI connector, internal
signal assignments12
SCSI port, external13
signal assignments, internal SCSI connector12
sleep state20
software modifications20
T, U
32-bit I/O space memory map10
24-bit I/O space memory map10
V, W, X, Y, Z
venting, enclosure5
video support13
declaration ROM20
hardware13
software20
VRAM13
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