28 Jul
2014
28 Jul
'14
3:53 p.m.
On Mon, Jul 28, 2014 at 11:21 AM, Mark Kahrs <mark.kahrs at gmail.com> wrote:
Let me add that the PDP 11/44 was microcoded...
Specifically, it was used
by CMU to do C.mmp and Cm*.
I think you mean the PDP-11/40? IIRC, in addition to replacing the
microcode ROMs, they modified the hardware to add additional data
paths to make it more useful for the custom microcode.
All PDP-11s other than the 11/20 were microcoded, but except for the
WCS options for the 11/03 and 11/60, the microcode was in ROM.
Eric
* and the dubious 11/10 OEM version of the 11/20, not to be confused
with the 11/10 OEM version of the 11/05)