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K Service Source
Macintosh Quadra 900/950/
AWS 95
Macintosh Quadra 900, Macintosh Quadra 950, Apple
Workgroup Server 95
K Service Source
Basics
Macintosh Quadra 900/950/AWS
95
Basics Overview - 2
Overview
This manual includes
complete repair procedures
for the Quadra 900/950 and
the Apple Workgroup Server
95, pictured at left.
Figure: Macintosh Quadra 900/950 and AWS 95
K Service Source
Specifications
Macintosh Quadra 900/950/AWS
95
Specifications Processor - 1
Processor
CPU Motorola 68040 microprocessor
Built-in paged memory management unit (PMMU), floating-point
unit (FPU), and 8K memory cache
Quadra 900: 25 MHz
Quadra 950 and AWS 33 MHz
95:
Addressing 32-bit registers
32-bit address bus
32-bit data bus
Specifications Memory - 2
Memory
RAM
Quadra 900 4 MB standard, expandable to 256 MB (80 ns or faster
SIMMs)
Quadra 950 8 MB standard, expandable to 256 MB (80 ns or faster
SIMMs)
AWS 95 16 MB, 32 MB, or 48 MB parity RAM standard, expandable to
256 MB (80 ns or faster 9-bit SIMMs)
ROM 1 MB, using two 150 ns, 256K by 16-bit chips
PRAM 256 bytes of parameter memory
Specifications Memory - 3
VRAM 1 MB, expandable to 2 MB (100 ns or faster VRAM SIMMs) by
installing four 256K or two 512K SIMMs
Clock/Calendar ASIC clock chip with PRAM and DFAC support and seven-year
lithium battery
Specifications Disk Storage - 4
Disk Storage
Floppy Drive Internal, 1.4 MB Apple SuperDrive
Hard Drive
Quadra 900 and 950 230, 500, or 1000 MB hard drive (optional)
AWS 95 230, 500, 1000, or 2000 MB hard drive; comes in either a two-
drive or five-drive configuration
Note: Refer to Take Apart for more information on the two-
drive configuration and to Additional Procedures for more
information on the five-drive configuration.
Specifications Disk Storage - 5
DDS-DC Drive 2 GB digital data storage-data compression drive for 4 mm tape
backup; available as an upgrade on the Quadra 900 and 950;
optional on the AWS 95
Specifications I/O Interfaces - 6
I/O Interfaces
SCSI One external SCSI port; DB-25 connector
Quadra 900 One internal SCSI port with 50-pin IDC connector; Supports a
maximum of eight devices (including the computer, which is
always device 7)
AWS 95 and Quadra Two internal SCSI ports with 50-pin IDC connectors; Two
900/950 (with PDS external SCSI ports with DB-25 connectors; Supports a
card upgrade) theoretical limit of 20 devices (including the computer, which
is always device 7) on four separate SCSI buses (two internal
and two external); Macintosh Operating System supports only
7 devices
Apple Desktop Bus One Apple Desktop Bus (ADB) port; low-speed, synchronous
serial interface
Specifications I/O Interfaces - 7
NuBus Five slots support standard and oversize cards, burst-mode
transfers, a processor write buffer, and NuBus '90; 96-pin
Euro-DIN connectors
Expansion One 68040 processor-direct slot (PDS) with 140-pin connector
Serial Two RS-232/RS-422 ports with mini DIN-8 connectors;
230.4 Kbits/sec. maximum; 0.920 Mbits/sec. if external clock
source is provided (modem interface only)
Asynchronous, synchronous (modem only), and AppleTalk
(printer only) protocols supported
Sound 8-bit stereo output; 8-bit monoaural input
Supports electret-type microphone
Specifications I/O Interfaces - 8
Video Supports Apple monitors (8-bit), VGA monitors, and NTSC and
PAL video standards
Ethernet One Ethernet port, AUI-15 connector
Specifications Sound and Video - 9
Sound and Video
Video Display Built-in 8-bit video circuitry (upgradeable to 24-bit)
Supports Apple 8-bit monitors and many non-Apple monitor
types (NTSC, PAL, VGA)
Sound Generator Four-voice, wavetable synthesis
Stereo sampling generator
Microphone Electret, omnidirectional; output voltage is 4 mV, peak to peak,
at normal value
Specifications Electrical - 10
Electrical
Line Voltage 100