On Sun, 3 May 2020 at 12:53, Henry Bent wrote: > On Sun, 3 May 2020 at 12:14, Clem Cole wrote: > >> >> Paul W -- do you remember if DEC TLG did a version of dbx for Ultrix >> (Leslie might remember)? FWIW: I know that DEC had a number of different >> debugger projects so on the UNIX side over the years, and I really don't >> remember what was done for the VAX, as I was not there at the time. By >> MIPS/Alpha in the mid-late 90's there was a whole new debugger stream that >> had been developed at part of GEM, but there was another one that came from >> MIPs too which was based on dbx. >> > > Perhaps unsurprisingly, as Ultrix 1 was basically just 4.2BSD with some > tweaks/addons, dbx has been there since the beginning as /usr/ucb/dbx. The > binary in 1.1 has SCCS strings mostly dating it to '83 and the 2.0 source > tree has dates that are mostly December '84. > Ultrix-32m 1.0 also has dbx, with dates no later than August '83. These dates mostly correspond to the 4.2 source tree on TUHS ( https://minnie.tuhs.org/cgi-bin/utree.pl?file=4.2BSD/usr/src/ucb/dbx ) but not exactly - the 4.2 tree has a newer object.c, implying that DEC was getting early copies of 4.2. The later fixes in Ultrix 1.1 also imply that DEC was getting regular updates from UCB. -Henry