4 Apr
2007
4 Apr
'07
10:01 p.m.
On Wed, 4 Apr 2007, David Betz wrote:
Well, there's always virtual memory. Back when I
was in college we
had a PDP-12 and I *really* wanted an 11 to play with (things haven't
changed much!). So, I wrote a PDP-11 simulator that ran on the 8. It
used disk space on an RK01 hard drive for virtual memory and could
simulate a PDP-11 with up to 32k of memory on a PDP-8 with only 8k.
Of course, it wasn't very fast but it did run ODT-11 (sort of). I
still have a listing of it. Some day I'll try typing it in to see if
it will work on the SBC6120 system that I'm building.
This sounds like it could be adapted for my purposes. Some things I'd
want to address:
1) Can you specify which pages to swap? For the Z-machine, one would
want to swap the game data first, then the interpreter (if at all).
2) Perhaps this emulator could be stripped down to to run one particular
program: Frotz compiled for pdp11.
3) Can the emulator be wrapped up with the only binary it will run? The
idea is to have a single Frotz binary for pdp8 to simplify distribution.
--
David Griffith
dgriffi at cs.csubak.edu
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