[Unix-jun72] Fwd: Trying to restore 1972 UNIX
wkt at tuhs.org
Thu May 1 16:05:07 AEST 2008
Guys, I got this message from Dennis.
----- Forwarded message from Dennis Ritchie -----
Subject: Re: Trying to restore 1972 UNIX
Date: Thu, 1 May 2008 00:55:35 -0400
About the assembler, I am pretty sure that it's substantially
the same as that on the 5th edition tape, so it's likely
that a modified version, without the syscall definitions,
could be produced.
I have dug up another listing of the PDP-11 assembly languge
version, which seems to about contemporary with the
one you have. The files mostly bear a copyright date
of 1972, but like other printouts from the time,
the datestamps only give month and day, not year.
They are generally from May. It is post 11/45,
and has segmentation and floating-point support.
Incidentally, it doesn't use any of the system call names
as such; 'read' is at sysread: and so on.
About assembling it, I'm pretty sure we just did
'as u?.s' and the a.out was ready. This was before
make, after all.
----- End forwarded message -----
I replied and asked if we could get either a scan copy of the "other listing",
or if he could send a photocopy to Tim.
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