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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