TUHS

tuhs@tuhs.org

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6475 discussions

Re: [TUHS] Unix & Memory Management Units (MMU)

by jnc＠mercury.lcs.mit.edu

> From: "Erik E. Fair" <f > One imagines that many pointer mistakes (bugs) in assembly or C were > discovered and squashed in that version, modulo the historical > unhappiness resulting from address zero containing a zero if > dereferenced ("NULL pointers") in process address space. PS: PDP-11 Unix didn't, I think, do much (anything?) to solve the null pointer problem. (This is for early C versions; I don't know about the later BSD ones.) Location 0 was a usable address for both read and write for everything except 'pure-text' (0410 magic word) processes; in those it was only legal for read. Address 0 mostly did not contain a 0, either; for C programs using the stock run-time, it contained a 'setd' instruction, except in split I+D processes, in which case data space location 0 probably (I'm too busy to spin up my V6 emulator to check) contained some of the program's initialized data (unless special arrangements had been made). Noel

8 years, 4 months

Re: [TUHS] Unix & Memory Management Units (MMU)

by jnc＠mercury.lcs.mit.edu

> From: "Erik E. Fair" > Which version of Unix first ran on a computer with virtual addressing That would be the first version to run on the PDP-11/45; I'm not sure which one that was, there's not enough left of Version 2 or Version 3 to see; Version 4 definitely ran on the 11/45: http://minnie.tuhs.org/cgi-bin/utree.pl?file=V4/nsys/ken/45.s > My guess from a quick look at the history of the DEC PDP-11 is that the > target computer was likely a PDP-11/35 or PDP-11/40 with a KT11-D > "memory management" module. No, they came after the -11/45 (with the KT11-C MMU). > What year did that come about? They got one of the first -11/45's, per a Unix history document I'm too busy to dig up, so 1972. Noel

8 years, 4 months

Re: [TUHS] looking for 4.1a BSD full kernel source

by Jason Stevens

I'm not sure if my other reply got though, so I'll try again... I found the source to the BBN stack in the CSRG CD's it's on CD 4 /sys/deprecated/bbnnet LINT.bbn 08-Aug-2016 06:37 3.5K NOTES 08-Aug-2016 06:37 4.6K RELAY.bbn 08-Aug-2016 06:37 1.2K SCCS/ 08-Aug-2016 06:37 - fsm.h 08-Aug-2016 06:37 1.2K fsmdef.h 08-Aug-2016 06:37 9.6K hmp.c 08-Aug-2016 06:37 12K hmp.h 08-Aug-2016 06:37 3.2K hmp_subr.c 08-Aug-2016 06:37 6.5K hmp_traps.c 08-Aug-2016 06:37 3.5K hmp_traps.h 08-Aug-2016 06:37 2.7K hmp_var.h 08-Aug-2016 06:37 1.4K ic_output.c 08-Aug-2016 06:37 5.7K icmp.c 08-Aug-2016 06:37 17K icmp.h 08-Aug-2016 06:37 3.3K in.c 08-Aug-2016 06:37 12K in.h 08-Aug-2016 06:37 2.0K in_pcb.c 08-Aug-2016 06:37 11K in_pcb.h 08-Aug-2016 06:37 1.9K in_proto.c 08-Aug-2016 06:37 4.9K in_var.h 08-Aug-2016 06:37 2.2K ip.h 08-Aug-2016 06:37 3.3K ip_input.c 08-Aug-2016 06:37 29K ip_output.c 08-Aug-2016 06:37 14K ip_usrreq.c 08-Aug-2016 06:37 3.8K macros.h 08-Aug-2016 06:37 4.4K net.h 08-Aug-2016 06:37 2.4K nopcb.h 08-Aug-2016 06:37 318 raw_input.c 08-Aug-2016 06:37 9.4K rdp.h 08-Aug-2016 06:37 15K rdp_cksum.s 08-Aug-2016 06:3 7 4.4K rdp_fsm.c 08-Aug-2016 06:37 4.5K rdp_input.c 08-Aug-2016 06:37 9.6K rdp_macros.h 08-Aug-2016 06:37 7.9K rdp_prim.c 08-Aug-2016 06:37 13K rdp_states.c 08-Aug-2016 06:37 34K rdp_subr.c 08-Aug-2016 06:37 8.4K rdp_usrreq.c 08-Aug-2016 06:37 21K seq.h 08-Aug-2016 06:37 415 sws.h 08-Aug-2016 06:37 326 tcp.h 08-Aug-2016 06:37 8.6K tcp_input.c 08-Aug-2016 06:37 12K tcp_prim.c 08-Aug-2016 06:37 9.8K tcp_procs.c 08-Aug-2016 06:37 28K tcp_states.c 08-Aug-2016 06:37 20K tcp_usrreq.c 08-Aug-2016 06:37 22K udp.c 08-Aug-2016 06:37 5.2K udp.h 08-Aug-2016 06:37 1.1K udp_usrreq.c 08-Aug-2016 06:37 7.0K I've been meaning to try to try to manually mash stuff together but just haven't gotten around to it. > ---------- > From: Paul Ruizendaal > Sent: Thursday, December 1, 2016 4:30 PM > To: tuhs(a)minnie.tuhs.org > Subject: [TUHS] looking for 4.1a BSD full kernel source > > > Hi, > > I'm trying to find out exactly what was in the 4.1a BSD distribution, as > far as the kernel is concerned. The image in the CSRG archive comes from a > tape that had a hard read error and does not include any kernel sources. > Some of the kernel files were already covered by SCCS around that time, > but not everything. My main focus is to understand tcp/ip networking in > 4.1a and whether the kernel could be built with either the Berkeley or the > BBN network stack. > > Does anybody know where I could find a full set of kernel sources for the > 4.1a BSD kernel? > > Many thanks in advance! > > Paul >

8 years, 4 months

The History of Unix

by Angus Robinson

Hi I am sure there must have been an email about this if so, I do apologies. The below link is from Diomidis Spinellis work, I remember seeinng an email from him a few months ago requesting some information about the history of BSD. Looking at it, he has done some amazing work. I look forward to playing with 386BSD! https://github.com/dspinellis/unix-history-repo

8 years, 4 months

looking for source code to University of Illinois "Network Unix"

by Paul Ruizendaal

Hi, I'm looking for the source code to "Network Unix" as described here: https://tools.ietf.org/html/rfc681 and/or its later development described here: https://archive.org/details/networkunixsyste243kell Actually, I'd be happy with finding the source code to any version of this Network Unix. This version of Unix had fairly wide use in the Arpanet community and was in use at several universities and organizations (e.g.: Rand, BBN, etc.) Would anybody here know of a surviving copy? Many thanks in advance, Paul

8 years, 4 months

Re: [TUHS] looking for 4.1a BSD full kernel source

by Paul Ruizendaal

Hi Diomidis, Thanks for that link. This is exactly what I'm trying to ascertain, and I'm finding conflicting evidence. - The socket API was in a state of flux between October '81 and March '82 (when 4.1a was supposedly cut). By March '82 it was mostly there, but not until later in the year did it fully stabilize. - The BBN stack did not use the sockets API as late as January '82 - What I currently fathom from the SCCS files is that the socket API implementation was hard coded to use the nascent Berkeley stack. - But the BBN code was likely in the 4.x BSD source tree, outside of SCCS (Berkeley started out with the BBN code, but it morphed quite quickly and drastically) - In 1985 the BBN code finally enters SCCS (marked 'deprecated'); this code was integrated with the sockets API, and much developed from its 1982 form Either the below link is correct (and I think I may have contributed to its view in a private mail to Kirk), or there were two different distributions (4.1a BSD with Berkeley network code and 4BSD with BBN network code). The two may have merged into one in peoples' memories: 35 years is a long time. Finding the actual kernel source for the 4.1a distribution could provide clarity on this point. Perhaps Bill Joy could shed some light on the issue, but I don't have contact details. Having actual source removes all doubt. Paul On 1 Dec 2016, at 10:51 , Diomidis Spinellis wrote: > The best description I could find is the following: > > http://minnie.tuhs.org/pipermail/tuhs/2016-September/007417.html > > > The 4.1a distribution had the initial socket interface with a > > prerelease of the BBN TCP/IP under it. There was wide distribution > > of 4.1a. The 4.1b distribution had the fast filesystem added and > > a more mature socket interface (notably the listen/accept model > > added by Sam Leffler). > > Diomidis > > On 01/12/2016 10:30, Paul Ruizendaal wrote: >> >> Hi, >> >> I'm trying to find out exactly what was in the 4.1a BSD distribution, as far as the kernel is concerned. The image in the CSRG archive comes from a tape that had a hard read error and does not include any kernel sources. Some of the kernel files were already covered by SCCS around that time, but not everything. My main focus is to understand tcp/ip networking in 4.1a and whether the kernel could be built with either the Berkeley or the BBN network stack. >> >> Does anybody know where I could find a full set of kernel sources for the 4.1a BSD kernel? >> >> Many thanks in advance! >> >> Paul >> >

8 years, 4 months

looking for 4.1a BSD full kernel source

by Paul Ruizendaal

Hi, I'm trying to find out exactly what was in the 4.1a BSD distribution, as far as the kernel is concerned. The image in the CSRG archive comes from a tape that had a hard read error and does not include any kernel sources. Some of the kernel files were already covered by SCCS around that time, but not everything. My main focus is to understand tcp/ip networking in 4.1a and whether the kernel could be built with either the Berkeley or the BBN network stack. Does anybody know where I could find a full set of kernel sources for the 4.1a BSD kernel? Many thanks in advance! Paul

8 years, 4 months

Re: [TUHS] RIP J.F.Ossanna

by Norman Wilson

Larry McVoy: I've always morned that he died so early. I would have liked to talk to him, I love troff to this day. ==== Me too (s/morn/mourn/, of course). I might even have had the chance to work with him. The original UNIX crowd were all really neat characters, albeit sometimes a trifle overly characterful. All nice guys to work with, too, at least those who were still around when I was at 1127. Norman Wilson Toronto ON

8 years, 5 months

RIP J.F.Ossanna

by Dave Horsfall

We lost J.F.Ossanna in 1977; he had a hand in developing Unix, and was responsible for "roff" and its descendants. Remember him, the next time you see "jfo" in documentation. -- Dave Horsfall DTM (VK2KFU) "Those who don't understand security will suffer."

8 years, 5 months

Grace Hopper

by Rudi Blom

Probably most read about it, but just FYI "Grace Hopper and Margaret Hamilton awarded Presidential Medal of Freedom for computing advances" https://techcrunch.com/2016/11/17/grace-hopper-and-margaret-hamilton-awarde… Grace's wiki page shows a 'real' computer bug :-)

8 years, 5 months

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TUHS