LISP implementations on small machines

Eric Smith spacewar at
Fri Oct 4 15:32:01 CDT 2019

I wrote:

> Code can be executed from the MMU PAR registers on processors with
> 22-bit addressing (11/23, 11/24, 11/44, 11/70, and J-11 based systems).

On Fri, Oct 4, 2019 at 2:25 PM Noel Chiappa via cctalk <
cctalk at> wrote:

> My QBUS machine is apart at the moment, so I can't verify this before
> posting, but I don't think this hack works on the J-11 machines;

You're correct, I misremembered. F-11 and TTL machines with 22-bit
addressing can execute out of the PARs, but the J-11 cannot.

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