Re: PCcard (2)

From: Ruud Baltissen (
Date: 2001-04-09 14:38:55

> 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
> 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

Groetjes, Ruud

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