From: utzoo!decvax!cca!Douglas@sri-unix
Newsgroups: net.unix-wizards
Title: MTPR, VAX, and System III inquiry
Article-I.D.: sri-unix.1912
Posted: Sat Jun 26 20:08:51 1982
Received: Tue Jun 29 01:42:37 1982

Date: 11 Jun 1982 at 1313-CDT
Does anyone know why a VAX-11/780 booting UNIX System III would have
the following strange behavior?
$$ unix		! boot using standalone shell
	HALTED AT 1
The in-core image of UNIX looks fine, and debugging shows that one of
the first few instructions executed,
	MTPR	address,SBB
fails to load SBB with the address (0x200)!  Patching in a halt here
and manually entering the desired value into SBB lets UNIX continue
to boot successfully.

Have we uncovered a microcode bug?  I believe we are using VMS 3.0
console floppies (god knows why).

P.S. VMS runs fine, and $$ lets us run all the standalone utilities
with no problem.
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