[TUHS] AT&T 3B1 - Emulation available

[Henry Bent]

On Wed, 3 Feb 2021 at 09:59, Clem Cole <clemc at ccc.com> wrote:

>
>
> On Wed, Feb 3, 2021 at 5:14 AM Ed Bradford <egbegb2 at gmail.com> wrote:
>
>> 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
>
>
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
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