The directories root and usr contain the files from the "s2-bits tape", which Dennis Ritchie extracted from an old DECtape at Bell Labs, which is available here: https://minnie.tuhs.org/TUHS/Archive/Distributions/Research/1972_stuff/
Dennis notes that "s2-bits is not source, but a dump of (parts of) /bin, /etc, /usr/lib, and bits of a few other directories".
The files on the "s2-bits tape" are split into two directories:
root- files froms2.tar.gz, excluding the usr directory, used to populate the rf0 filesystem.usr- files froms2.tar.gzunder the usr directory, used to populate the rk0 filesystem.
Binaries which have been built recently while reconstructing the system are in the new directory, and include:
new/etc/init - built from jun72 printout sources for init.s with modifications to spawn getty on tty8 (console) only.
The following list gives details of all the files in the s2-bits tap-format archive. The first columns are a direct copy of a listing done with the emulated 1st Edition tap(1) from the s2-bits tape.
The last column gives the file's modified timestamp (in decimal) as recorded in the archive: I captured the smdate(2) argument in Apout as tap(1) tried to extract the archive. This is in 1/60th second units.
The list is sorted by the TAP DATE column.
MODE UID SIZE TAPA DATE NAME TAP DATE =============================================================== -rwr- 0 16448 538 Jan 1 00:33 /core 121912 -rwr- 10 54 529 Jan 1 00:52 /usr/x 188944 -rwr- 10 84 474 Jan 1 00:58 /usr/jack/x.f 209544 -rwr- 0 312 490 Jan 1 00:58 /usr/jack/x.o 210381 xrwr- 0 7514 475 Jan 1 00:58 /usr/jack/a.out 210836 -r-r- 1 1664 533 Jan 1 01:31 /tmp/etma 328795 -rwr- 1 670 530 Jan 1 01:33 /usr/ken/maki.s 336810 -rwr- 0 142 532 Jan 1 01:33 /tmp/utmp 337991 -rwr- 0 512 259 Jan 1 01:33 /etc/std0 338378 xrwr- 0 698 229 Jan 1 01:35 /bin/maki 344095 -rwr- 0 26 537 Jan 1 01:35 /tmp/ttmp 344821 -rwr- 0 16448 260 Jan 1 01:36 /usr/sys/core 347684 -rwr- 1 1928 298 Jan 1 01:36 /usr/sys/maki.s 348923 xrwr- 0 2192 293 Jan 1 01:37 /usr/sys/a.out 349375 xrwr- 3 1912 135 Jan 4 17:05 /bin/form 19243860 urwr- 0 3940 142 Jan 5 19:26 /bin/mail 24936840 xrwr- 1 2662 241 Jan 6 18:01 /etc/glob 29812654 xrwr- 1 186 240 Jan 6 18:01 /etc/msh 29812724 urwr- 0 784 50 Jan 17 17:46 /bin/mv 86785042 xrwr- 3 134 114 Jan 17 17:53 /bin/cat 86808907 xrwr- 3 82 25 Jan 17 17:53 /bin/chmod 86808926 xrwr- 3 420 93 Jan 17 17:53 /bin/cmp 86808947 xrwr- 3 160 48 Jan 17 17:53 /bin/cp 86808966 xrwr- 3 464 79 Jan 17 17:53 /bin/du 86809052 xrwr- 3 104 49 Jan 17 17:53 /bin/ln 86809162 xrwr- 3 2010 42 Jan 17 17:53 /bin/ls 86809182 xrwr- 3 154 126 Jan 17 17:53 /bin/mesg 86809205 xrwr- 3 70 121 Jan 17 17:53 /bin/rew 86809297 xrwr- 3 93 52 Jan 17 17:53 /bin/rm 86809316 xrwr- 3 1026 54 Jan 17 17:53 /bin/stat 86809356 xrwr- 3 80 125 Jan 17 17:53 /bin/tty 86809419 xrwr- 3 524 57 Jan 17 17:53 /bin/write 86809532 xrwr- 3 560 77 Jan 17 17:54 /bin/who 86813788 xrwr- 3 644 139 Jan 17 17:54 /bin/wc 86813793 xrwr- 3 750 164 Jan 17 17:54 /bin/skip 86813802 xrwr- 3 1166 115 Jan 17 17:54 /bin/pr 86813803 xrwr- 3 300 141 Jan 17 17:54 /bin/od 86813807 xrwr- 3 1844 159 Jan 17 17:56 /bin/if 86819396 xrwr- 3 1154 156 Jan 17 17:56 /bin/goto 86819398 xrwr- 3 276 163 Jan 17 17:56 /bin/exit 86819403 xrwr- 3 1054 153 Jan 17 17:56 /bin/echo 86819406 xrwr- 3 244 60 Jan 17 17:56 /bin/dsw 86819407 xrwr- 3 5922 80 Jan 17 17:56 /bin/bas 86819408 xrwr- 3 16 152 Jan 17 17:56 /bin/: 86819410 xrwr- 1 954 32 Jan 19 17:20 /bin/sh 97059255 xrwr- 3 2310 103 Jan 26 17:20 /bin/ar 133346922 xrwr- 3 1048 166 Jan 31 18:14 /bin/stty 159458885 xrwr- 6 2860 169 Mar 7 12:23 /bin/cal 339637168 -rwr- 3 2082 233 Mar 28 16:42 /etc/suftab 449432781 urwr- 0 1290 28 Mar 29 15:19 /bin/login 454317684 xrwr- 3 4066 95 Mar 29 16:42 /bin/db 454616955 xrwr- 3 76 94 Apr 6 19:42 /bin/chball 496735250 xrwr- 3 446 232 Apr 7 16:40 /etc/getty 501264829 xrwr- 3 6846 176 Apr 14 20:50 /bin/dc 538454712 urwr- 0 794 26 Apr 20 23:45 /bin/date 570186721 urwr- 0 746 190 May 3 22:54 /bin/su 637395674 xrwr- 3 3998 127 May 10 15:23 /bin/ed 672059949 xrwr- 3 330 213 May 27 00:21 /bin/find 756940137 xrwr- 3 480 59 May 27 00:21 /bin/strip 756940428 urwr- 1 872 211 May 27 00:26 /bin/ds 756957948 xrwr- 10 2730 192 May 27 23:37 /bin/fc 761966733 xrwr- 3 17092 346 Jun 6 21:26 /usr/lib/c1 813333853 -rwr- 0 3498 339 Jun 9 17:10 /usr/lib/bilib.a 827964344 -rwr- 0 6626 326 Jun 20 10:47 /usr/lib/libb.a 883611316 xrwr- 3 7582 214 Jun 30 17:45 /bin/as 936955268 xrwr- 3 5778 247 Jun 30 17:47 /etc/as2 936962166 xrwr- 3 238 118 Jun 30 18:37 /bin/un 937143109 -rwr- 0 12158 302 Jun 30 18:40 /usr/lib/liba.a 937154143 xrwr- 3 2942 108 Jun 30 19:26 /bin/ld 937319472 xrwr- 3 518 75 Jun 30 20:09 /bin/nm 937472871 xrwr- 3 1446 208 Jun 30 20:15 /bin/size 937496145 -rwr- 6 304 448 Jun 30 20:31 /usr/lib/fr0.o 937553564 -rwr- 6 12222 449 Jun 30 20:37 /usr/lib/filib.a 937573356 -rwr- 6 9158 419 Jun 30 20:46 /usr/lib/libf.a 937606048 -rwr- 0 108 473 Jun 30 21:11 /usr/lib/crt0.o 937696858 -rwr- 0 5242 437 Jun 30 21:20 /usr/lib/libc.a 937728015 xrwr- 3 19948 380 Jun 30 21:21 /usr/lib/c0 937734428 xrwr- 3 4672 198 Jun 30 21:53 /bin/cc 937848855 xrwr- 6 3462 491 Jul 1 16:35 /usr/fort/fc1 941888104 xrwr- 6 3238 498 Jul 1 16:35 /usr/fort/fc2 941888184 xrwr- 6 6840 505 Jul 1 16:35 /usr/fort/fc3 941888472 xrwr- 6 4918 519 Jul 1 16:35 /usr/fort/fc4 941888613 xrwr- 3 214 175 Jul 15 01:21 /bin/sum 1011175062 xrwr- 4 7154 61 Jul 21 12:42 /bin/roff 1044729738 urwr- 0 282 53 Sep 28 21:37 /bin/rmdir 1404349922 urwr- 0 232 31 Nov 6 21:42 /bin/mkdir 1606544287 urwr- 1 192 92 Nov 22 19:35 /bin/df 1689030995 urwr- 1 1084 122 Nov 22 19:35 /bin/check 1689030997 xrwr- 3 718 46 Nov 22 22:51 /bin/chown 1689737545 xrwr- 3 604 150 Nov 22 22:51 /bin/sort 1689737557 urwr- 1 790 119 Nov 26 14:24 /bin/tm 1708647263 urwr- 0 3678 34 Dec 31 04:08 /bin/tap 1887871165 -rw-- 1 221 239 Feb 6 14:35 /etc/passwd 2081934621 -rwr- 1 70 238 Feb 6 14:38 /etc/uids 2081948231 xrwr- 1 424 231 Feb 6 14:50 /etc/init 2081988977 