13 Nov
2003
13 Nov
'03
9:42 a.m.
Date: Thu, 13 Nov 2003 12:30:34 +1100 (EST)
From: John Holden <johnh(a)psych.usyd.edu.au>
To: pups(a)minnie.tuhs.org
Subject: [pups]
Re: A project--buiilding a device to plug into a PDP-11's bus
Gregg C Levine wrote :-
At one time there was a set of application notes that described how
to build a PDP11 clone out of AM2901 bit slices. I think that the
performance would have been approximately that of an 11/40, while
the time and effort and parts cost would have been prohibitive for
a one-off production.
It is barely possible that I have a set of those notes somewhere,
although it would take a very lucky random search to find them.
carl
--
carl lowenstein marine physical lab u.c. san diego
clowenst(a)ucsd.edu
I also recall that the processor in question at
one point in its
lifespan, actually used the AM2901 family of bit-slice processors.
DEC didn't use 2901's in central processors, but the FPU's for 11/34 and
11/44 used 16 of them to make the 64 bit data path for the FPU. They were
also used in some peripherals like the KMC-11.