Here you can find the contents of the Unix v4 tape ready for bootstrapping

Summary

UNIX Fourth Edition Here you can find the contents of the UNIX v4 tape ready for bootstrapping, including a tar file of the filesystem. unix_v4.tap is the original tape file in simh format bootstrap are the first 38400 bytes of the tape disk.rk is the rest of the tape, an RK05 image unix_v4.tar is the filesystem extracted install.ini is an ini file for simh to install the system boot.ini is an ini file for simh to boot the system At first I extracted the disk image manually from the tape, which resulted in bootstrap and disk.rk. These are really nothing more than the first 38400 bytes of the raw tape content and the rest. Because unix_v4.tap is block based, one first has to strip it of its block sizes to get the raw content. Actually it's easier to just use the tape as it is and install a new system from it. Installing the system To install the system we just dump an RK05 disk image from tape to disk: % pdp11 install.ini [...] ; boot from TM0, now in mboot =list dldr dtf list mboot mcopy rkf tboot uboot =mcopy 'p' for rp; 'k' for rk k disk offset 0 tape offset 75 count 4000 = Afterwards, we can just load uboot from tape to start UNIX: =uboot k unix mem = 64530 login: root # ls bin dev etc lib mnt tmp unix usr # sync # sync # sync # ^E ; end emulation Running the system To boot the system we don't need the tape. Instead, we load uboot directly from the boot sector. We specify k for RK05, then the filename unix. % pdp11 boot.ini [...] ; boot from RK0, now in uboot k unix mem = 64530 login: root # Rebuilding the kernel Put the following into /usr/sys/run: rm -f low.o mch.o conf.o lib1 lib2 chdir ken cc -c *.c sh mklib rm *.o chdir ../dmr cc -c *.c sh mklib rm *.o chdir .. cc -c conf/conf.c mv conf/conf.o conf.o as conf/low.s mv a.out low.o as conf/mch.s mv a.out mch.o ld -x low.o mch.o conf.o lib1 lib2 /usr/sys/ken/mklib: ar r ../lib1 main.o ar r ../lib1 alloc.o ar r ../lib1 iget.o ar r ../lib1 prf.o ar r ../lib1 rdwri.o ar r ../lib1 slp.o ar r ../lib1 subr.o ar r ../l...