6522 and 6821
Posted: Fri May 19, 2023 8:18 pm
I am trying to rehab a machine that was built using a 6522 and 2-6821s (and a number of secondary chips) for its control functions by replacing them with a SuperPro and 2 Prostarts(avoids having to deal with interrupts). When I trace the digital outs from the original chips, they all seem to connect to inverting buffers. Was there something about these chips that made using inverting buffers necessary?
Thanks
Thanks