11 May
2008
11 May
'08
3:38 p.m.
On Fri, May 09, 2008 at 10:34:10PM -0400, Doug Merritt wrote:
FYI I recovered 100% of the s1 src code fragments; I
presume this
is of interest to y'all on this list, yes?
Certainy is Doug. Next time you e-mail in, I'll set you as being able to
post without a subscription. I forgot when I let your first 2 e-mails thru.
Where can we get your reassembled fragments?!
And reading the archived messages, wow, you guys got
an amazing
amount done in a very short time! Congrats! (Boy am I glad I don't
have to do all that by myself after all...)
I'm glad I don't have to rebuild the s1 fragments :) Thanks!
Note that ed1.s and ed2.s are missing. Their source
code simply wasn't
in any of the fragments (which means, was not on the s1 disk image).
Damn, oh well. I should have a look at 5th Edition to see if "ed" is
in C by that stage, or still in asm form.
NOTE: I am not sure of precisely when s1 dates to, but
many of these
source files use the "jsr r5, 0: <buffer>" calling convention that
requires writable code segments -- did that go away sharply with the
pdp11/20 to pdp11/45 move, or no?
Probably, but it's hard to tell. We don't have any early assembly stuff
which would date from the 11/45: it's the s1/s2 tapes, then the early
C compilers, then the "nsys" kernel which just predates 3rd Edition.
P.S. Since doing the above, I've been working on
a disassembler; it
works ok, and emits of course 'as'-syntax asm, and accepts a markup-
command file to allow e.g. introduction of human-chosen labels for octal
addresses -- and I'm nearly done
adding the ability to produce "1f" "1b" style branch labels -- I
created a bunch of bugs in the process of doing that.
We'd love to get a copy. I started on a disassembler myself...
P.P.S. While you're asking Ken and Dennis for
more listings, ask them
for any "Unics" PDP 7 listings they may have, too! I suspect Ken even
has a Space Travel listing lying around, although I don't think he
has ever mentioned it over the decades.
Shall do.
Thanks again Doug.
Warren