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K Service Source
Macintosh Plus
K Service Source
Basics
Macintosh Plus
Basics Overview - 1
Overview
This manual contains
complete repair procedures
for the Macintosh Plus,
shown at left.
Figure: Macintosh Plus
K Service Source
Specifications
Macintosh Plus
Specifications Introduction - 1
Introduction
Specifications information for this product can be found in this chapter and also in the
Spec Database, which you can access in one of three ways:
-- Launch it directly by double-clicking the Apple Spec Database runtime alias at the top
level of the Main Service Source CD.
-- Select "Apple Spec Database" from the Service Source drop-down main menu.
-- Click the Acrobat toolbar icon for the database, which is near the right end of the
toolbar with the letters "SP."
Specifications Processor - 2
Processor
CPU Motorola 68000 microprocessor
7.83 MHz
32-bit internal data bus
Specifications Memory - 3
Memory
RAM 1 MB, expandable to 4 MB (150 ns or faster SIMMs)
ROM 128K
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 - 4
Disk Storage
Floppy Drive Internal, double-sided drive: uses 3.5-in., hard-case floppy
disks--either double-sided, 800K capacity or single-sided,
400K capacity
Specifications I/O Interfaces - 5
I/O Interfaces
Floppy Drive External drive port; DB-19 connector
SCSI One SCSI parallel port; DB-25 connector
Mouse Mouse port; DE-9 connector
Keyboard Synchronous serial keyboard bus; RJ-11 connector
Serial Two RS-422 serial ports; mini DIN-8 connectors
Specifications I/O Devices - 6
I/O Devices
Keyboard 78 keys, including numeric keypad and cursor keys; 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 - 7
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 by 342 pixel, bit-mapped display
Specifications Electrical - 8
Electrical
Line Voltage 105