10 Apr
1998
10 Apr
'98
2:51 p.m.
From: Tony Duell [mailto:ard@p850ug1.demon.co.uk]
Actually, it's all discrete TTL chips (74S181 ALUs, 74161's for the
program counter, etc). The KMC11 and DMR11 (a later version
That's right 'ls181, a crude bit slice ALU. I remember there was a way
to download microcode directly, the RSX driver supported it. None of
those cool 2900 series slices were around yet, maybe even the 8x305 was
still on the drawing board. I still have the AMD 2901 design book,
heavy going but it tells you everything you ever want to know about
building a CPU from scratch. I don't suppose anyone has some kind of
system built from 2901 bit slices? Roll your own microcoded instruction
sets?
Jack Peacock
10 Apr
10 Apr
2:15 p.m.
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3:27 p.m.
On Fri, 10 Apr 1998, Jack Peacock wrote:
building a CPU from scratch. I don't suppose
anyone has some kind of
system built from 2901 bit slices? Roll your own microcoded instruction
sets?
As a project in a computer architecture class, I built a virtual PDP-8
from virtual 2901's. I wrote a 2901 simulator,
microcode assembler, and
the the PDP-8 microcode itself. (I've got it
somewhere; I'll stick it
on a web page if I ever find it.)
-- Doug
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