TUHS June 2015

tuhs@tuhs.org

30 participants
21 discussions

by Brantley Coile

I remember seeing a manual on the C/A/T typesetter at one point. I didn’t see it in bitsavers.org. Anyone have a pdf of it? bwc

8 years, 10 months

recreating bj.s for Unix v5

by Mark Longridge

I noticed that the assembly source file for blackjack is missing from the source tree so I tried to recreate it, so far unsuccessfully. My first idea was to grab bj.s from 2.11BSD and assemble it the Unix v5 as command. That seems to generate a bunch of errors. Also other assembly source files don't seem to have .even in them. Another idea would be generate the source code from the executable itself, but there doesn't seem to be a disassembler for early Unix. It's possible that v5 bj.s was printed out somewhere but so far no luck finding it. Mark

8 years, 10 months

Re: [TUHS] success, bj assembled and linked in Unix v5

by norman＠oclsc.org

Mark Longridge: chmod 0744 bj Dave Horsfall: That has to be the world's oddest "chmod" command. ====== Not by a long shot. Recently, for reasons related both to NFS permissions and to hardware testing, I have occasionally been making directories with mode 753. At the place I worked 20 years ago, we wanted a directory into which anonymous ftp could write, so that people could send us files; but we didn't want it to become a place for creeps to stash their creepy files. I thought about the problem briefly, then made the directory with mode 0270, owned by the user used for anonymous ftp and by a group containing all the staff members allowed to receive files that way. That way creeps could deposit files but couldn't see what was there. I also told cron to run every ten minutes, changing the permissions of any file in that directory to 0060. Oh, and I had already maniacally (and paranoiacally) excised from ftpd the code allowing ftp to change permissions. I admit I can't think of a reason to use 744 offhand, since if you can read the file you can copy it and make the copy executable. But UNIX permissions can be used in so many interesting ways that I'm not willing to claim there is no such reason just because I can't see what it is. Norman Wilson Toronto ON

8 years, 10 months

success, bj assembled and linked in Unix v5

by Mark Longridge

OK, success... in Unix v5: as bj.s etc.s us.s ld a.out -lc mv a.out bj chmod 0744 bj It seems to work OK now. Probably should work on v6 and v7 as well. Mark

8 years, 10 months

Re: [TUHS] recreating bj.s for Unix v5

by jnc＠mercury.lcs.mit.edu

> From: Mark Longridge <cubexyz(a)gmail.com> > My first idea was to grab bj.s from 2.11BSD and assemble it the Unix v5 > as command. That seems to generate a bunch of errors. Also other > assembly source files don't seem to have .even in them. My first question was going to be 'Maybe try an earlier version of the source?', but I see there is no earlier version online. Odd. ISTR that some of the fun things in V6 came without source, maybe blackjack was the same way? > Another idea would be generate the source code from the executable > itself, but there doesn't seem to be a disassembler for early Unix. Where's the binary? I'd like to take a look at it, and see if the source was assembler, or C (there's a C version in the source tree, too). Then I can look and see how close it is to that 2.11 source - that may be a re-implementation, and totally different. Noel

8 years, 10 months

Re: [TUHS] success, bj assembled and linked in Unix v5

by jnc＠mercury.lcs.mit.edu

> From: Mark Longridge <cubexyz(a)gmail.com> > OK, success... Yeah, I just got there too, but by a slightly longer route! (Google wasn't turning up the matches for the routines I needed, which you found in etc.s, etc - it seems the source archive on Minnie isn't being indexed by Google. So I wound up cobbling them together with a mix of stuff from other places, along with stuff I wrote/modified.) > Probably should work on v6 and v7 as well. Does on V6, dunno about V7. > It seems to work OK now. Yes, but this is _not_ the source for the V5/V6 'bj'. (I just checked, and the V5 and V6 binaries are identical.) Right at the moment, I've used enough time on this - I may get back to it later, and disassemble the V5/V6 binary and see what the original source looks like. Noel

8 years, 10 months

Re: [TUHS] recreating bj.s for Unix v5

by jnc＠mercury.lcs.mit.edu

> From: Noel Chiappa > another assembler source file, which contains the following routines > which are missing from bj.s: I missed some. It also wants quest1, quest2 and quest5 (and maybe more). This may present a bit of a problem, as I can't find any trace of them anywhere, and will have to work out from the source what their arguments, etc are, what they do, etc. I wonder how on earth the 2.11 people got this to assemble? (Or maybe they didn't?) Noel

8 years, 10 months

Re: [TUHS] recreating bj.s for Unix v5

by jnc＠mercury.lcs.mit.edu

> From: Mark Longridge <cubexyz(a)gmail.com> > My first idea was to grab bj.s from 2.11BSD and assemble it the Unix v5 > as command. That seems to generate a bunch of errors. I saw that there's a SysIII bj.s, which is almost identical to the 2.11 one; so the latter is probably descended from the first, which I assume is Bell source. So I grabbed it and tried to assemble it. The errors are because bj.s is designed to be assembled along with another assembler source file, which contains the following routines which are missing from bj.s: mesg decml nline Dunno if you're aware of this, but, the line 'as a.s b.s' _doesn't_ separately assemble a.s and b.s, rather it's as if you'd typed 'cat a.s b.s > temp.s ; as temp.s'. (This is used in the demi-enigmatic "as data.s l.s" in the system generation procedure.) I looked around in the sources that come with V6, and I didn't see any obvious such file. I'm going to whip the required routines up really quickly, and see if the results assemble/run. I looked to see if I could steal them from the binary of 'bj' on V6, and... it looks like that binary is totally different from this source. Let me look into this... > Also other assembly source files don't seem to have .even in them. The V6 assembler groks '.even'. Noel

8 years, 10 months

DMR's web site

by Aharon Robbins

Hello All. FYI. Warren - can you mirror? > Date: Thu, 11 Jun 2015 04:41:39 -0400 (EDT) > From: Brian Kernighan <bwk(a)cs.princeton.edu> > Subject: dmr web site (fwd) > > Finally indeed. I can't recall who else asked me about > Dennis's pages, so feel free to pass this on. > And someone ought to make a mirror. If I were not far > away at the moment, I'd do so myself. > > Brian > > ---------- Forwarded message ---------- > Date: Tue, 09 Jun 2015 16:32:13 -0400 > To: Brian Kernighan <bwk(a)CS.Princeton.EDU> > Subject: dmr web site > > finally, try this: https://www.bell-labs.com/usr/dmr/www/ > > It's almost a complete copy of Dennis Ritchie's pages, with some > adaptation needed for the new location. There are a few broken links, > but hopefully they're not too annoying.

8 years, 10 months

Unix and the PDP-10

by Nelson H. F. Beebe

This new paper may be of interest to list readers: Dan Murphy TENEX and TOPS-20 IEEE Annals of the History of Computing 37(1) 75--82 (2015) http://dx.doi.org/10.1109/MAHC.2015.15 In particular, the author notes on page 81: >> ... >> The fact that UNIX was implemented in a reasonably portable language >> (at least as compared with 36-bit MACRO) also encouraged its spread to >> new and less expensive machines. If I could have done just one thing >> differently in the history of TENEX and TOPS-20, it would be to have >> coded it in a higher-level language. With that, it's probable that the >> system, or at least large parts of it, would have spread to other >> architectures and ultimately survived the demise of the 36-bit >> architecture. >> ... ------------------------------------------------------------------------------- - Nelson H. F. Beebe Tel: +1 801 581 5254 - - University of Utah FAX: +1 801 581 4148 - - Department of Mathematics, 110 LCB Internet e-mail: beebe(a)math.utah.edu - - 155 S 1400 E RM 233 beebe(a)acm.org beebe(a)computer.org - - Salt Lake City, UT 84112-0090, USA URL: http://www.math.utah.edu/~beebe/ - -------------------------------------------------------------------------------

8 years, 10 months

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TUHS June 2015