Lisp, the machine language. Was Re: Hallelujah!

From: Buck Savage <hhacker_at_home.com>
Date: Sun Apr 4 21:02:23 1999

>> Consider the PDP 11/44 in my living room. It is constructed using the
>> AMD 2900 series of bit-slice microprocessor chips. In this case, the
>
>Well, I've never seen a PDP11 processor (as opposed to a floating point
>processor or a VAX) that uses 2900 series. IIRC the 11/44 uses 74S181
>ALUs and a sequencer built from TTL (and maybe some 82S100 PLAs)
>
>-tony
>

Not mine. I just pulled the processor card and it contain 16 of the
AM2901BDC chips, copyright 1978. The card has designation M7093
imprinted in the PCB metalisation layer. Well, upon closer inspection
this seems to be the FPP. The card designated M7094 does have
four of the 74181 type chips, and this is probably the general purpose
CPU component.

Any way, the point that I was trying to make is that the control code
for the 2901 was contained in ROM, and not so much that the CPU
was implemented via the 2901. Lets concentrate on the issue, not
the errors associated with making the point.

William R. Buckley
Received on Sun Apr 04 1999 - 21:02:23 BST