1BSD was Bill Joy's first Berkeley Software Distribution. The README says:

This tape includes sources and binaries for a quantity of UC Berkeley software. The major items on this tape are the instructional Pascal system and the text editor "ex". Other software here includes a modified shell, a new shell, new commands, and a "star trek" game. Machine readable documentation is included for all programs. The "Pascal User's Manual" and the "Ex reference manual" need a phototypesetter if readable copies are to be produced.

The files here come from 1bsd.tar.gz, donated by either Keith Bostic or Kirk McKusick.

For more information about 1BSD, see Twenty Years of Berkeley Unix by Kirk McKusick.

READ_ME 6833 1977-11-23
TAPE 426 1977-11-23
UPDATE 59 1977-11-23
ashell dir
assubs dir
bin dir
etc dir
ex-1.1 dir
exrecover dir
exrefm dir
eyacc dir
fpterp dir
help dir
lib dir
man1 dir
man5 dir
man6 dir
man7 dir
man8 dir
opcodes dir
pcs dir
pi dir
portlib dir
printd 100 1977-11-23
puman dir
px dir
pxp dir
pxref dir
s1 dir
s6 dir
s7 dir
s8 dir
setup 379 1977-11-23
tests dir
trek dir
wow 45752 1977-11-23
x 50490 1977-11-23