3 Feb
2021
3 Feb
'21
4:33 p.m.
On Wed, 3 Feb 2021 at 09:59, Clem Cole <clemc(a)ccc.com> wrote:
On Wed, Feb 3, 2021 at 5:14 AM Ed Bradford <egbegb2(a)gmail.com> wrote:
Was the "X" prefix always used for prototypes? I remember having an
XC68020 in something - might have been an Sun 3/60, or an early Mac IIcx?
-Henry
Hay, Arnold,
MC 68K was created in 1980 or thereabouts. We talked about 10's of
Megahertz, I think, in those times.
The original X series part was originally unnumbered but a sticker was
later set for the lids that said X68000 (I had one on my desk - which was
used for the Tektronix Magnolia prototype).[1] The X series ran at 8 Mhz,
but the original released (distributed - MC68000) part was binned at 8 and
10 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