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  1. R

    Apple Lisa 2/5 starts only without I/O board - Error 41

    Hi. I've used a logic analyzer and I saw that all the outputs of the 74LS138 were at logic 0. Meanwhile I've repaired a spare CPU board, with a bad 74LS244
  2. R

    Apple Lisa 2/5 starts only without I/O board - Error 41

    Repaired!!! The problem was a bad 74LS138 in the CPU Board.
  3. R

    Apple Lisa 2/5 starts only without I/O board - Error 41

    Hi there from Italy! I'm new here. I have a Lisa 1 computer upgraded to 2. The machine sadly is not working. I started with a bad DataPower 1A PSU that I recapped and now it works. On the CPU board I found a bad EPROM so I wrote them again on 2 brand new 2764-30 EPROMs. I replaced the VSROM...
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