PDP11 M9301-Yx ROM dumps

Jay West jwest at classiccmp.org
Thu May 12 13:24:53 CDT 2016

Do the M9312 roms help?



-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Mattis Lind
Sent: Thursday, May 12, 2016 1:10 PM
To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org>
Cc: Noel Chiappa <jnc at mercury.lcs.mit.edu>
Subject: Re: PDP11 M9301-Yx ROM dumps

2016-03-26 17:57 GMT+01:00 Noel Chiappa <jnc at mercury.lcs.mit.edu>:

> OK, so we already had a dump of the M9301-YA ROMs, but were 
> (apparently) missing the others?
> So I fnally got one of my UNIBUS 11's running, and whipped up a small 
> program to dump the ROM contents, and now have the -YB, -YF and -YH 
> ROMs dumped.
> I'm
> in the process of disassembling them now.

I also have a YF card. It came from a PDP-11/10 and was sitting in location slot 3.
I put it into my NC and there were no smoke coming out anywhere...

I could access the contents but it didn't run very well. So either the CPU is still bad or the PROM contents are bad.
Could you please direct me to your YF dumps so I could compare? Intel HEX would be fine.

If you also have done a disassembly that would be very interesting.


> (If anyone needs the contents in binary format, to blow new ROMs, let 
> me know, and I can probably produce them if you give me the details on 
> the format you need the data in.)
> Does anyone have any of the others - YC, YD, YE and YJ?
> If you're not up to dumping them, I can send you my small program 
> (currently in .LDA format, but I can convert it to a script - it is 
> not very long at all
> - for the console emulator in the M9301 series), which will do it - it 
> produces packed octal output, 8 words/line, so a very small output.


>          Noel

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