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K Service Source
Macintosh
K Service Source
Basics
Macintosh
Basics Overview - 1
Overview
This manual includes repair
procedures for the earliest
Apple Macintosh
computers--the Macintosh
128K and Macintosh 512K.
Figure: Macintosh 128k/512K
K Service Source
Specifications
Macintosh
Specifications Processor - 1
Processor
CPU Motorola 68000 microprocessor
7.83 MHz
32-bit internal data bus
Specifications Memory - 2
Memory
RAM 128K or 512K
ROM 64K
PRAM CMOS custom chip with 4.5 V, user-replaceable battery backup
(includes 256 bytes of memory; remembers system
parameters even with the machine switched off)
Specifications Disk Storage - 3
Disk Storage
Floppy Drive Internal, single-sided drive; uses 3.5-in., hard-case, 400K
floppy disks
Specifications I/O Interfaces - 4
I/O Interfaces
Floppy Drive External drive port; DB-19 connector
Mouse Mouse port; DE-9 connector
Keyboard Synchronous serial keyboard bus; RJ-11 connector
Serial Two RS-232/RS-422 serial ports; DE-9 connectors
Specifications I/O Devices - 5
I/O Devices
Keyboard 58 keys; software mapped; RJ-11 connector
Mouse Mechanical tracking; optical shaft encoding at 3.54 pulses per mm
(90 pulses per in.) of travel; DE-9 connector
Specifications Sound and Video - 6
Sound and Video
Sound Generator Four-voice sound with 8-bit digital/analog conversion, using
22-kHz sampling rate
Video Display 9-in. (diagonal) screen; 512 x 342 pixel, bit-mapped display
Specifications Electrical - 7
Electrical
Line Voltage 105