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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