> After this, you can use "Pseudo DMA", which > consists of convincing the card that its on a (very slow) DMA channel by > manually toggling the lines to clock data in. Thanks for this idea. I haven't read the doscs I have about DMA yet so I have to find out which lines are needed to transfer data. > Mind you, ISA's dma doesnt > provide the destination address from the expansion card. It's actually the > DMAC's responsibility to do this, so we dont need to change the address > lines. Of course, the 8237 provides the addresslines. I completely forgot. But if so, why "tristating" the 6522 ? But I'm still thinking about adding an 8237 (optional) as I can imagine that there are datatransfers which need a bigger throughput the a 6510/8502 can provide. 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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