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K Service Source
Centris 650/Quadra 650
K Service Source
Basics
Centris 650/Quadra 650
Basics Overview - 1
Overview
This manual includes
complete repair procedures
for the Macintosh Centris
650/Quadra 650 shown at
left.
Figure: Macintosh Centris 650/Quadra 650
K Service Source
Specifications
Centris 650/Quadra 650
Specifications Processors - 1
Processors
Centris 650 Motorola 68040
25 MHz
Built-in memory management unit (MMU)
Quadra 650 Motorola 68040
33 MHz
Built-in memory management unit (MMU)
Coprocessor Optional floating-point unit (FPU)
Addressing 32-bit internal registers
32-bit address bus
32-bit data bus
Specifications Memory - 2
Memory
RAM 4 or 8 MB RAM, expandable to 132 MB (72-pin SIMM)
ROM 1 MB
PRAM 256 bytes nonvolatile parameter memory
VRAM 512K, expandable to 1 MB
Clock/calendar CMOS custom chip with long-life lithium battery
Specifications Disk Storage - 3
Disk Storage
Floppy Drive 1.4 MB Apple SuperDrive
Hard Drive Internal Apple SCSI hard drive
80 MB to 500 MB
CD-ROM Optional internal 5.25-in. CD-ROM drive
Specifications I/O Interfaces - 4
I/O Interfaces
SCSI One SCSI port; DB-25 connector
Supports a maximum of six external devices (internal SCSI
devices include the computer, which is always device 7)
Apple Desktop Bus Two Apple Desktop Bus (ADB) ports; mini-Din-4 connectors
Low-speed synchronous serial interface
Serial Two RS-232/RS-422 serial ports; mini DIN-8 connectors
230.4 Kbps maximum
0.92 Mbps maximum, clocked externally
NuBus Three NuBus slots
Specifications I/O Interfaces - 5
Expansion Slot One inline processor-direct slot
Sound One stereo-capable output port
One monaural input port
Video One video port, DB-15 connector
Supports Apple monitors (8-bit)
VGA and SVGA monitors require a special adapter cable
Ethernet On-board Apple Ethernet port
Specifications I/O Devices - 6
I/O Devices
Keyboard Standard, extended, or adjustable keyboard connected through two
ADB ports
Maximum power draw for all ADB devices: 500 mA
Keyboard draws 25