perfect, thanks I can use this.
On Wed, Jul 5, 2017 at 3:17 PM, Noel Chiappa via cctalk <
> > From: William Degnan
> > what is the memory range
> That's in the disassembly page:
> From: William Degnan
> what is the memory range
That's in the disassembly page:
765000-765776 and 773000-773776
> can you post the ROM dump so I can compare on my end?
Well, the contents are in that page too, but
what is the memory range / can you post the ROM dump so I can compare on my
end? Just the memory contents will be fine, if this is convenient. I will
call up same in PDPGUI and compare there.
On Wed, Jul 5, 2017 at 11:24 AM, Noel Chiappa via cctalk <
> From: Fritz Mueller
> Even better news: I was subsequently able to dump the contents of my
> M9301-YB, and found they do indeed exactly match the contents ...
> posted in [the] M9301-YB disassembly.
When I get as chance, I'l do more work on the disassembly
On Jul 5, 2017 1:49 AM, "Fritz Mueller via cctalk"
> Well, the situation had worsened on my M9301 to the point where every
single word was affected, and then it was easy to see that it was always in
the least-significant four bits. So I pulled and reseated that
Well, the situation had worsened on my M9301 to the point where every single
word was affected, and then it was easy to see that it was always in the
least-significant four bits. So I pulled and reseated that PROM, then went
ahead and did the other three as well for good measure (really should
Hi folks, thanks for all the help!
> On Jul 4, 2017, at 8:34 AM, Noel Chiappa via cctalk
>> I see a few words with different values than the ones that Noel has
>> listed in his partial M9301-YB disassembly.
> Any chance you could send in some of the
I pulled out the M9301 and M9302 drawings from the set and uploaded them to
On 7/4/17 8:34 AM, Noel Chiappa via cctalk wrote:
> As Mattis says, they are in the 11/04 drawings (MP00019). But I'm a bit
> puzzled why you didn't find them online; I have a page, "'Missing'
> > I may also have a go at writing a program I can toggle in to read the
> > contents of my failing M9301 and dump them out over the console
> > to enable a systematic comparison
> Let me find the one I wrote, and upload it.
I have a 9301-YB and
> From: Fritz Mueller
> A question for Noel if he's listening here
You rang? :-)
> how did you obtain your YB listing
I plugged one in, and ran a small program that dumped the contents to the
> would you consider it reliable?
Reasonably. If there was bit-rot in
> There is a note in the M9301 Operator’s Manual about the layout of the
> PROMs - words split into 4 bit fields programmed in all the PROMs in
> “parallel”, lower 8 bits inverted to support extra invert in the switch
> circuitry, and higher-addressed bank in the lower-half of the PROMs.
An M9301-YB bootstrap terminator that I’ve been using during the restoration of
a PDP-11/45, which has previously worked fine, now seems to be failing on me.
Examining the contents from the front panel I see a few words with different
values than the ones that Noel has listed in his
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