XT/370 microcode

[Guy Sotomayor Jr]

> On Mar 12, 2018, at 9:57 AM, Eric Smith via cctalk <cctalk at classiccmp.org> wrote:
> 
> 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.

I think there was also an article in the IBM Systems Journal when the XT/370
was announced that basically described how this was done and how everything
worked.

TTFN - Guy