> At 05:14 PM 7/11/2000 +0200, David Olofson wrote:
> >
> >x86 doesn't have DMA on the chip (*), but uses either the 8 DMA channels on
> >the mainboard chipset (4 x 8 bit + 4 x 16 bit; normally used with ISA
> >boards) or PCI busmaster DMA, which is supported by the PCI chipset but
> >performed by the PCI cards themselves. AGP is quite similar to PCI in this
> >respect, AFAIK.
> >
> >(*) exception: some x86 clones for embedded systems, with some standard
> > chipset functionality included.
>
> That's not quite correct: The Intel 80186/80188 had integrated DMA. What is
> (closer to being) correct is that no "PC's" were produced with an x86 CPU
> with integrated DMA -- indeed it could be argued that if a computer had
> integrated DMA, then it wasn't a PC-work-alike and hence not a "PC".
>
> Norm
Thanks for the comments David and Norm.
Do the 80386, 486, P & PII have DMA on board, or is it only the embedded 80188?
--
Andrew Tuckey
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