[TUHS] Re: Software written in B

Here's what I know about surviving early UNIX B implementations bits: Two surviving B programs from PDP-7 UNIX listings: https://github.com/DoctorWkt/pdp7-unix/blob/master/scans/ind.b https://github.com/DoctorWkt/pdp7-unix/blob/master/scans/lcase.b NOT a b program, but for "fun" I tried my hand at recreating the TMG compiler compiler for the PDP-7 (we only have the original library routines, but not the TMG (.t) source for the compiler at: https://github.com/philbudne/pdp7-unix/tree/tmg/src/other/pbtmg and tried writing a B compiler in TMG (b.t in the above directory) based on Robert Swierczek's decoding of the B interpreter/runtime. Both the PDP-7 and (initial?) PDP-11 B compilers generated interpreted code. I'm not aware if the PDP-11 B compiler source has ever been unearthed, but a ar(chive) file of the library and interpreted was found, and Robert S posted disassemblies here: https://github.com/rswier/pdp11-B/ With this explanation of where the files were discovered: https://github.com/rswier/pdp11-B/tree/master/fs As well as http://squoze.net/B/bilib/ Which I added to Robert's tree in a private branch that I guess I never opened a Pull Request for: https://github.com/philbudne/pdp11-B/tree/pb/source/bilib And I (think) I had to make up brt1.s and brt2.s files: https://github.com/philbudne/pdp11-B/blob/pb/source/brt/brt1.s https://github.com/philbudne/pdp11-B/blob/pb/source/brt/brt2.s based on the usage description in Ken's manual: https://www.bell-labs.com/usr/dmr/www/kbman.html : ld object /etc/brt1 -lb /etc/bilib /etc/brt2 I tried to hack Robert's PDP-7 B compiler to work with the above PDP-11 runtime: https://github.com/philbudne/pdp11-B/blob/pb/source/b711/ But I don't remember what state I left it in. Ken's manual indicates that the original PDP-11 B compiler had two phases: "bc" which generated intermediate code, and "ba" which turned that into a .s file. A "fun fact" about all the above compilers (TMG and B) for both the PDP-7 and the PDP-11 is that the compilers (eventually) output assembly language source that was assembled (and for the PDP-11 loaded) with an interpreter library and runtime. I seem to recall that for the PDP-7, the interpreted code (for both TMG and B) looks much like PDP-7 instructions (same number of high order "opcode" bits, some use of the indirect bit, and an address field while the PDP-11 B compiler (at least) generated code is more like threaded code, with an interpreter program counter in r3, and "jmp *(r3)+" to dispatch to the next instruction.