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
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...