I tried swapping the 2 boot chips, same result. Removed both, same result.
At this point, I need to know:
Do the files BOOTEVEN and BOOTODD match the original Trump Card boot chips and which goes where (D0-7/D8-15)?
I reproduced the circuit from the article except for the dynamic RAM. I know there was an error in the DRAM logic but that didn't affect my version. I don't know if there are difference between the schematic and the official Trump Card.
If someone have a working Trump Card, I would like to see the result of the DIAG.COM program.