On Thu, 12 Apr 2001, john/lori wrote: > > Now I have the idea that what you mean with DMA is what the REU does: it > > copies/swappes an amount of memory situated outside the C64 from/to/with an > > amount of memory inside the C64. I haven't thought about this idea. But you > > need two 8237's to perform this trick. And then you need 32 bytes for the > > DMA alone. > > I've never used the thing and perhaps I misunderstand what you're > saying, but you shouldn't need two 8237s. > Memory to memory is done with two DMA channels, channel 0 is the > source and channel 1 is the destination. I _completely_ forgot about the ram-to-ram block copy feature. ;) > > and (iirc) the chip is accessed through 16 locations, 4 address > lines, and each access toggles a fifth internal address bit and > there's a command to reset that bit to a known state. > > bogax > - > This message was sent through the cbm-hackers mailing list. > To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tml.hut.fi. > - 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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