On 4/12/07, Vassilis PREVELAKIS <vp at drexel.edu> wrote:
This quote from the article "System/370
capability in a desktop Computer"
(IBM System Journal Vol 23, No 2, 1984), may help resolve this issue:
..The remaining instructions are emulated by an MC68000R microprocessor
which also performs other tasks such as exception handling.
Having said that, I also remember reading somewhere about the 68000
with modified microcode somewhere (maybe Byte magazine?)
I have heard of a lot of m68k variants (including XC-series parts),
but I've never heard of an MC68000R... perhaps the R is the
significant indicator?
-ethan