Hallo allemaal, I had a haircut today. This is one of the few moments I am forced to take a rest and to do nothing. I was thinking about the PC-card and I suddenly realized that we need two 8237's anyway for the simple reason the 16-bit ISA-bus has 7 DREQ/DACK lines. This also solves the problem of 16-bit transfers as we can use the second 8237 for this feature like a 286+ does. Unfortunally I still haven't found any details. I remember that someone said that he maybe had the missing page I was looking for. Unfortunally I didn't note the name. I hope this person will read this email and will be so kind to tell if he found anything at all. Some study revealed that an IDE-interface does 16-bit transfers only. AFAIK the IDE interface doesn't use DMA-lines. DREQ2/DACK2 are connected but, AFAIK, only used by the floppy-drive. But that does not mean one cannot initiate a DMA transfer from IDE to memory. Is anybody familiar with this subject? Groetjes, Ruud http://Ruud.C64.org/ - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tml.hut.fi.
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