At 05:14 PM 7/11/2000 +0200, David Olofson wrote:
>Sat, 08 Jul 2000 Andrew Tuckey 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
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