Master Series Service Manual
6 Test equipment
A PORT tester is available for the microcomputer. It will check the
DRAMs
(including siueways RAM), CMOS RAM, and all the I/O ports on the
microcomputer: disc, printer, user, 1MHz bus, TUBE, UHF, video, ROB,
RS423, cassette, A to D, and sound output. To use this tester, the
microcomputer must at least have the CPU running and the MOS/BASIC ROM
working and some of
the RAM working.
The PORT test software is contained in a cartridge ROM and on disc.
Full operating instructions are supplied with the equipment.
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Issue 1
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