I did some experiments with my PET and PC last night. Conclusion: The 74LS74 does not work very well if its operating voltage (from the DIAG pin of the PET user port) is 1.75 volts. I downloaded the ECP and EPP descriptions from the Warp Nine home page. If my interpretation is correct, the protocols require four handshake lines, but I believe it would be possible to cope with 2 or 3 handshake lines on the Commodore side by using latches, like the cable designed by Frank Kontros does. Has anyone investigated this? I think EPP is the way to go. If there are no DMA capable EPP chipsets for PCs now, there probably will be in the future. This means that data transfers using EPP won't generate much load on the PC's CPU (as if that was a problem; most transfers would take at most a few seconds). BTW, I'm also dreaming of an Atari VCS 2600 cartridge with a few kilobytes of static RAM and a cable to the PC's parallel port, making it possible to transfer games to the cartridge. With some buffering, further games could maybe even be downloaded while a game is being played on the system. Marko - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tcm.hut.fi.
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