(Topic ID: 188598)

Gott Sys80B MPU IRQ stuck high

By minnesota13

6 years ago


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#3 6 years ago

When the IRQ line remains high it is usualy an indication the program isn't starting. I would check the selection signals for PROM1 (at the piggyback), address + databus signals from the 6502 CPU to the PROM1 socket.

I wrote a system80 testprogram which may give you some new insights. PM me if you would like to have it.

Marco

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