TUHS

tuhs@tuhs.org

25 participants
6475 discussions

by Warren Toomey

All, I've just got back from a few days away to find 14 new subscription requests to the TUHS mailing list. Welcome aboard to you all. Normally I only get one request a month, so I have some concerns about the legitimacy of all these requests, so accept my apologies in advance if there is any off-topic e-mails in the next few days. P.S The mail while I was away was very interesting. Noel, you might also be interested in the B interpreter and Robert Swierczick's B compiler the PDP-7 Unix. The original B compiler doesn't exist, so Robert took the 11/20 C compiler and "undid" the code that does types so that it "became" a B compiler. https://github.com/DoctorWkt/pdp7-unix/tree/master/src/other Cheers all Warren

8 years, 4 months

Happy birthday, Tommy Flowers!

by Dave Horsfall

Tommy Flowers MBE was born on this day in 1905; amongst other things he designed Colossus, the world's first programmable electronic computer, which was used to break the German Lorenz cipher (not Enigma, as some think). Relevance to Unix? Well, without the world's first usable computer we would not have the world's first usable OS, and M$ would probably reign supreme by now... -- Dave Horsfall DTM (VK2KFU) "Those who don't understand security will suffer."

8 years, 4 months

Re: [TUHS] nm on Third Edition .o files?'

by jnc＠mercury.lcs.mit.edu

> More here: > http://minnie.tuhs.org/pipermail/tuhs/2014-October/005218.html Which sez: There is a second document, untitled, no date, which I have not been able to locate online at all. .. From the content, it seems to be from shortly after the previous one, so say, circa 1977. I poked around in a dump of the CSR Unix which I now have available to me, and found a copy of it. I just checked the Internet (using the canonical search engine) for various phrases from it, but I still could not turn it up. So, here it is in machine-readable form: http://ana-3.lcs.mit.edu/~jnc/history/unix/CChanges.txt Hope this is some use to someone... :-) Noel

8 years, 4 months

phototypesetter C (was nm on Third Edition .o files)

by Doug McIlroy

Amusing, I don't think I ever heard the appellation "phototypesetter C" before. Certainly C and the phottypesetter developed independently, though in the same room. But the explanation that they got linked by appearing in the same tape release makes perfect sense. Thanks for the tidbit. Doug

8 years, 4 months

Re: [TUHS] nm on Third Edition .o files?'

by jnc＠mercury.lcs.mit.edu

> From: "Ron Natalie" > At some point .. and the ability to assign/pass structures got > supported, though I thought that was the compiler that came with V7. That is my vague recollection too. > I'm still annoyed they didn't fix arrays when they fixed structs. Which aspect? The ability to assign/pass/return arrays, or the funky way that array naming worked (I'm trying to remember the details, I think it was something to do with 'arrays' passed as arguments - it was actually a pointer that was passed, but the declaration didn't have to say 'pointer'). Noel

8 years, 4 months

Re: [TUHS] nm on Third Edition .o files?'

by jnc＠mercury.lcs.mit.edu

> From: Tony Finch > when did C get its cast operator? Well after that piece of code was written! :-) I don't recall exactly off the top of my head, but I recall 2-3 notes to users about the evolution of C post 'vanilla' V6; I think a lot of it was related to work being done on typetting stuff, hence the moniker 'phototypsetter compiler' which was applied to that 'improved' C. One of the notes is fairly common, but another I have only in hardcopy (although I scanned it at one point). I'll try and turn all of them, along with some notes I made about the differences between 'vanilla' V6 C and 'phototypsetter C' (which a lot of the later V6 users started with - I certainly did), into an article on the Computer History wiki on the early evolution of C. Noel

8 years, 4 months

Re: [TUHS] nm on Third Edition .o files?'

by jnc＠mercury.lcs.mit.edu

PS: > I recall 2-3 notes to users about the evolution of C post 'vanilla' V6 > ... > One of the notes is fairly common, but another I have only in hardcopy > (although I scanned it at one point). More here: http://minnie.tuhs.org/pipermail/tuhs/2014-October/005218.html If anyone knows of any other documentation of C evolution, I'd be interested in hearing about it for the Computer History wiki page. Noel

8 years, 4 months

Re: [TUHS] nm on Third Edition .o files?

by jnc＠mercury.lcs.mit.edu

> From: "Steve Johnson" > The number on the left is a PDP-11 address, probably for some kind of > control register. It's the Processor Status Word, which contained the CPU's hardware priority level, condition codes, etc. > That's a construction that's left over from B. I wonder why it was written as "0177776->integ", rather than "*017776"? Probably the former allowed the C compiler to work out what size the operand was. (BTW, 'integ' was declared in a structure declaration as follows: struct { int integ; }; (Did the code looked at actually say "0177776->int"? The compiler might have barfed on a reserved keyword being used like that.) Noel

8 years, 4 months

nm on Third Edition .o files?

by Diomidis Spinellis

Has anyone got a setup where they can run something like nm(1) on the compiled Third Edition Unix C files and send me the output? (Alternatively, just send me the .o files, and I'll whip up something to read their symbols.) I tried to compile the source code on a modern system by hacking old C to something closer to what GCC will accept, with commands such as the following. cc -E dp.c | sed 's/=$[&|+-]$/\1=/g;s/struct[ \t]*(/struct {/' | gcc -w -x c - However, I stumbled on the use of structure fields on things that aren't structures, e.g. "0177776->int =| 300"

8 years, 4 months

Re Dennis' Draft of the Unix Timesharing System: not so draft?

by arnold＠skeeve.com

I forwarded your note to BWK who seems to still have a few tenuous connections to the Labs. Good luck with it. Arnold

8 years, 4 months

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