Maybe I will get more responses here. A while ago I asked on c.s.c about the strange GATE IN signal input on the 264 series CPU, the 7501/8501. Because I want to make a discrete replacement from a 6502, some '245 drivers and a port chip, maybe a 6522 for the first experiments. But what does GATE IN do? One of the few Plus/4 resources mentions it as R/W GATE input, so I assume it has influence on the R/W output of the CPU. But why is it needed? Maybe because of the weird clock signals the TED feeds into the CPU? If that is all, a simple AND gate should be enough to do the same job. I really should have a look with an oscilloscope. Nicolas - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tcm.hut.fi.
Archive generated by hypermail 2.1.1.