Diff between 11/20 and 11/45?
Warren Toomey
wkt at cs.adfa.edu.au
Tue Sep 7 09:56:09 AEST 1999
Hi all,
Dennis Ritchie has unearthed some really old Unix a.out
executables from around 1st Edition - 2nd Edition period: see
Distributions/research/1973_stuff in the PUPS Archive.
[ Actually, I suspect his dates are a year off: they should be 1972 ]
I've printed off the 1st Ed manuals from Dennis' web page, and I'm
attempting to get my a.out emulator, Apout, to run these old binaries.
I've got a few working. cat works. ls and date run, but sort of give
strange outputs.
These executables were written for a PDP-11/20. Are there any significant
USER-MODE differences between the 11/20 and later PDP-11 models? I'm
thinking missing instructions, different addressing mode behaviour etc.
There is no source code with these binaries, so I can't use that to help
debug the emulator. I do have the following processor handbooks:
PDP-11 /20 /15 /R20 1972
PDP-11 /45 1973
PDP-11 /04 /34 /45 /55 /60 1978-79
I just thought I'd ask for pointers here before I hit them for details.
Cheers,
Warren
Received: (from major at localhost)
by minnie.cs.adfa.edu.au (8.9.3/8.9.3) id LAA27104
for pups-liszt; Tue, 7 Sep 1999 11:10:31 +1000 (EST)
More information about the TUHS
mailing list