Re: [pups] Re: A project--buiilding a device to plug into a PDP-11's bus - TUHS

13 Nov 2003

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  Date: Thu, 13 Nov 2003 12:30:34 +1100 (EST)
 From: John Holden &lt;johnh(a)psych.usyd.edu.au&gt;
 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 :-

  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. 
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