XT/370 microcode

Eric Smith spacewar at gmail.com
Mon Mar 12 11:57:38 CDT 2018


On Mon, Mar 12, 2018 at 10:54 AM, emanuel stiebler via cctalk <
cctalk at classiccmp.org> wrote:

> On 2018-03-12 15:49, Eric Smith via cctalk wrote:
> > As the most obvious example of the impedance mismatch between 370
> > architecture and 68000 microarchitecture, the 68000 is hardwired to have
> > eight each data and address registers, not sixteen GPRs, and microcode
> > can't easily paper over that.
>
> I wouldn't bet on that ...
>

I'm fairly sure of it, based on microarchitectural details in the US
patents on the 68000 design.


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