Building a 2.11BSD tape for Supnik's emulator
Markus Leypold
leypold at informatik.uni-tuebingen.de
Sat May 27 00:40:23 AEST 2000
Hello Seth,
I never worked with a real PDP-11. I tried to build a V7 Boot tape for
the Supnick and still did not succeed, but I got the following impressions:
* V7 Doc says, You can't use the bootstrap from the DEC bulk ROM,
but need to key in a custom bootstrap. Have a look into
the V7 Manual Volume 2B (Essay about Installing UNIX).
* It seems, a tape also needs to contain labels for the files
(512 Byte Records), kind of directory.
Regards -- Markus
Original Message:
---------------------------------
Hello folks,
I'm trying to build a 2.11BSD boot tape for Bob Supnik's emulator. I
downloaded the tape files from Distributions/ucb/2.11BSD, and put them
together with the following commands (on Linux):
cat mtboot mtboot boot | dd of=file0 obs=512
dd if=disklabel of=file1 obs=1024
dd if=mkfs of=file2 obs=1024
dd if=restor of=file3 obs=1024
dd if=icheck of=file4 obs=1024
dd if=root.dump of=file5 obs=10240
dd if=file6.tar of=file6 obs=10240
dd if=file7.tar of=file7 obs=10240
dd if=file8.tar of=file8 obs=10240
cat file? > boot.tape [I've verified the shell expands this
expression to the correct file order]
But when I run the simulator and try to boot from the tape (with or
without the -o optiont to 'boot'), it fails, like so:
% pdp11
PDP-11 simulator V2.3d
sim> set cpu 18b
sim> set cpu 2048K
sim> att tm0 boot.tape
sim> boot tm0
HALT instruction, PC: 000002 (HALT)
sim> boot -o tm0
HALT instruction, PC: 000002 (HALT)
sim>
It's like the bootstrap code isn't working. Or possibly I've completely
misunderstood the proper way to build a tape image. Is there a better
way to go about it?
- -Seth
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