[rescue] systems with user modifiable microcode.

[Lionel Peterson]

The early IBM PC/370 cards (Mainframe in your desktop) used
68000-family CPUs with modified instructon sets (I assume this was done
at fabrication time - 68000 core with enhancements.

The IBM AS/400 has a robust microcode that allows you to have one
hardware platform "switch" between AS/400 instruction set set *or* a
"Super System/38" instruction set.

Lionel


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Lionel

"Nothing would please me more than being able to hire ten
programmers and deluge the hobby market with good software"
Bill Gates, in "An OpenLetter to Hobbyists" dated February 3, 1976