--- Julian Richardson <JRichardson_at_softwright.co.uk> wrote:
>
> a couple of questions:
>
> does anyone have a spare 16MHz 68k CPU...
Was the MC68000-12 rated to 16Mhz, or did people just run it that fast? I
remember it was an issue for people who tried to clock-double their A500s.
> also, does anyone know of anything that used 68450 chips? (they're 4-channel
> DMA controllers for the 68k apparently).
I've seen at least one Amiga peripheral that used a Motorola DMA chip (forget
if it was 2-channel or 4-channel). Microbotics SCSI? Software Results had
a WAN router box that was never released, that used a 68450 per serial card
for high-performance serial (vs the non-DMA 8-port low performance card). I
doubt if you got it from that - I have the boxes (and 8-layer boards!) up
in the attic. ISTR they used 600 RPM 3.5" drives, too.
In the Motorola world, DMA went on the peripheral; in the Intel world, DMA
went on the motherboard.
-ethan
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Received on Thu Apr 26 2001 - 14:14:00 BST