Z80 MC testing

Kerem Kapkin All Messages By This Member #402 When I use the instructions on page 24, Examine Input Port, Press 5 12, read in12 78, instead I am getting blinking FF. Is this normal? Does this indicate in have an HW problem? IMG_8561.mov IMG_8561.mov
Kerem Kapkin All Messages By This Member #403 Removed the SIO card, now I am getting in12 78 Is it possible that the SIO card interfering with input port 12? SIO card is a new one, assembled with great caution and seem to be working fine, except this test case. I will have to replace all the ICs on the first one to recover, hopefully. toggle quoted message Show quoted text On Thu, Apr 3, 2025 at 9:09?PM Kerem Kapkin via <kkapkin=[email protected]> wrote: When I use the instructions on page 24, Examine Input Port, Press 5 12, read in12 78, instead I am getting blinking FF. Is this normal? Does this indicate in have an HW problem?

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