Posted By
gerliczer
on 2018-08-13
10:22:50
|  Re: Plus 4
U19 is the PLA. It is responsible for genearting chip select signals for peripherals like ACIA, Parallel port 6529B, keyborad latches, and ROM select logic. U23 is BASIC ROM and U25 is FUNCTION LOW ROM. There's no chance for your machine to start, as far as I can understand.
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