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K Service Source
Macintosh IIsi
K Service Source
Basics
Macintosh IIsi
Basics Overview - 1
Overview
This manual contains
complete repair procedures
for the Macintosh IIsi
shown at left.
Figure: Macintosh IIsi
K Service Source
Specifications
IIsi
Specifications Processor - 1
Processor
CPU Motorola 68030 microprocessor
20 MHz
32-bit internal data bus
256-byte instruction and data caches
Burst-mode RAM access
Built-in memory management unit (MMU)
Coprocessor Motorola 68882 floating-point unit (FPU) included on the
optional adapter card
20 MHz
Specifications Memory - 2
Memory
RAM 2 MB, expandable to 17 MB
ROM 512K standard
PRAM 256 bytes of parameter memory
Specifications Disk Storage - 3
Disk Storage
Floppy Drive Internal 1.4 MB floppy drive
Hard Drive Internal 40 MB hard drive
Optional internal 80 MB hard drive
Specifications I/O Interfaces - 4
I/O Interfaces
Expansion One slot for either a NuBus or 030 direct slot card
Power available (15 W maximum)
+ 5 V 2.0 A
+12 V 175 A
-12 V 150 A
SCSI One external SCSI port; DB-25 connector
Serial Two RS-422/RS-232/AppleTalk serial ports; mini DIN-8
connectors
Specifications I/O Devices - 5
I/O Devices
Keyboard Apple Keyboard, Apple Keyboard II, or Apple Extended Keyboard
connected through Apple Desktop Bus (ADB) ports (mini
DIN-4)
Mouse ADB mouse (mini DIN-4)
Specifications Sound and Video - 6
Sound and Video
Sound Generator Output impedance of 8