What I need to do is very simple for test purposes only. I need to make both of the ports outputs and then write a square wave into them at about 1 second rate.
I have an ATE system that I can use to set up data lines and write pulses and the like. I just have no experience in using the MC6821. Is there anyone who can give me the a simple explanation like... put this word on the data bus, pulse the enable, then put this on the data bus, pulse the enable, and so on so I can use the ATE to generate the square waves I need. I can do all the ATE programming, but this MC6821 has me stumped on how to use it. H E L P M E .... S O M E B O D Y