strange number corruption on pdp11/34
ak6dn at mindspring.com
Fri Jan 30 15:37:05 CST 2015
>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
> > 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?
Disassembled and re-commented source. Available here:
along with most all of the other M9312 boot and device PROMS.
> > 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'!
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