daver2
10k Member
STOP! Don't do anything as a result of post #300!
Fortunately, with the data bus being $F8 is a single-byte 6502 instruction SED (set D flag). This is just as good as a NOP instruction...
So, this is working.
Can you now scope the signals on CPU pins 26 through 33 looking for anything that is not a steady voltage (either HIGH or LOW).
Dave
Fortunately, with the data bus being $F8 is a single-byte 6502 instruction SED (set D flag). This is just as good as a NOP instruction...
So, this is working.
Can you now scope the signals on CPU pins 26 through 33 looking for anything that is not a steady voltage (either HIGH or LOW).
Dave