Motorola 68000-16 and 68450 chips...

From: Julian Richardson <JRichardson_at_softwright.co.uk>
Date: Fri Apr 27 05:14:36 2001

>> 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.

how did you know? :-)
I have an old A500 which it'd be nice to increase the speed of, add an IDE
disk to it, increase the memory etc. It had been left outside and all the
metal screening's gone pretty rusty, hence it makes a nice project machine!

The information I've seen suggests that SGS-Thompson parts were 12MHz and
Motorola-badged ones would run at 16 (even if they were badged as 12's). If
I can find one of the chips I'll find out :-)

> 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.

Nope, none of those. I had all of the boards from a phone exchange at one
point (that was a *lot* of silicon) and pulled many Z80 + support chips off
those, but don't remember there being any 68k-family stuff. Strange...

cheers

Jules
Received on Fri Apr 27 2001 - 05:14:36 BST