30 Jan
2015
30 Jan
'15
1:37 p.m.
-----Original Message-----
From: Noel Chiappa <jnc at mercury.lcs.mit.edu>
Sent: Jan 30, 2015 5:19 AM
To: cctalk at classiccmp.org
Cc: jnc at mercury.lcs.mit.edu
Subject: Re: strange number corruption on pdp11/34
Disassembled and re-commented source. Available here:
http://ak6dn.dyndns.org/PDP-11/M9312/
along with most all of the other M9312 boot and device PROMS.
From: Don North
So here is the octal print routine in the M9312
console boot prom for
the '34:
I'm curious, is that the 'original' source, or is this dis-assembled from the
PROM contents? Is the complete program available somewhere? So I would speculate either 'rol' or
'rolb' are always rotating in a 0
bit instead of the c-bit, or possibly the c-bit is stuck at zero.
Yup, good suggestion. And that would likely explain why things boot; I can't
see too many OS's using 'ROLB'!
Noel