On 2021-Feb-03 09:58:37 -0500, Clem Cole <clemc(a)ccc.com> wrote:
but the original released (distributed - MC68000) part
was binned at 8 and
There was also a 4MHz version. I had one in my MEX68KECB but I'm not
sure if they were ever sold separately. ISTR I got the impression
that it was a different (early) mask or microcode variant because some
of the interface timings weren't consistent with the 8/10 MHz versions
(something like one of the bus timings was a clock-cycle slower).
as were the later versions with the updated paging
microcode called the
MC68010 a year later. When the 68020 was released Moto got the speeds up
to 16Mhz and later 20. By the '040 I think they were running at 50MHz
I also really liked the M68k architecture. Unfortunately, as with the
M6800, Motorola lost out to Intel's inferior excuse for an architecture.
Moving more off-topic, M68k got RISC-ified as the ColdFire MCF5206.
That seemed (to me) to combine the feel of the M68k with the
clock/power gains from RISC. Unfortunately, it didn't take off.