If one was to use a discrete 'watchdog' IC, which would be better to use as an input, an address line or data bus line?
A circuit I'm looking at has it driven from the CA1 line off a 6821 PIA, but there is nothing in the setup section of the code telling the 6821 how to configure that line. I'm not sure why it works fine in the original but not my copy. I'm tempted to see if I can move the watchdog input from the 6821 to a convenient address or data line. Thoughts?
A circuit I'm looking at has it driven from the CA1 line off a 6821 PIA, but there is nothing in the setup section of the code telling the 6821 how to configure that line. I'm not sure why it works fine in the original but not my copy. I'm tempted to see if I can move the watchdog input from the 6821 to a convenient address or data line. Thoughts?