[rescue] systems with user modifiable microcode.

[Dave McGuire]

On Thursday, October 3, 2002, at 09:54 AM, Paul Sladen wrote:
>>> The early IBM PC/370 cards (Mainframe in your desktop) used
>>> 68000-family CPUs with modified instructon sets
>> It was done at fab time.
>
> Do you know what mods they did, I'm intrigued, were they specialist
> (for example) iteration instructions, or system level functions?

   All I've ever read about it is that they "rewrote the microcode" in a 
largely otherwise unmodified 68000 to execute the 370 instruction set.  
I've never been able to find more details.

     -Dave

--
Dave McGuire          "PC users only know two 'solutions'...
St. Petersburg, FL       reboot and upgrade."    -Jonathan Patschke