Re: M9301-YB ROM flaky

2017-07-05 Thread william degnan via cctalk
perfect, thanks I can use this. Bill On Wed, Jul 5, 2017 at 3:17 PM, Noel Chiappa via cctalk < cctalk@classiccmp.org> wrote: > > From: William Degnan > > > what is the memory range > > That's in the disassembly page: > > http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M9301-YB.mac > >

Re: M9301-YB ROM flaky

2017-07-05 Thread Noel Chiappa via cctalk
> From: William Degnan > what is the memory range That's in the disassembly page: http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/ROMs/M9301-YB.mac 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

Re: M9301-YB ROM flaky

2017-07-05 Thread william degnan via cctalk
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. Bill On Wed, Jul 5, 2017 at 11:24 AM, Noel Chiappa via cctalk < cctalk@classiccmp.org> wrote: > >

Re: M9301-YB ROM flaky

2017-07-05 Thread 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. Excellent news! When I get as chance, I'l do more work on the disassembly

Re: M9301-YB ROM flaky

2017-07-05 Thread william degnan via cctalk
On Jul 5, 2017 1:49 AM, "Fritz Mueller via cctalk" wrote: > > 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

Re: M9301-YB ROM flaky

2017-07-04 Thread 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 PROM, then went ahead and did the other three as well for good measure (really should

Re: M9301-YB ROM flaky

2017-07-04 Thread Fritz Mueller via cctalk
Hi folks, thanks for all the help! > On Jul 4, 2017, at 8:34 AM, Noel Chiappa via cctalk > wrote: > >> 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

Re: M9301-YB ROM flaky

2017-07-04 Thread Al Kossow via cctalk
I pulled out the M9301 and M9302 drawings from the set and uploaded them to bitsavers dec/unibus 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'

Re: M9301-YB ROM flaky

2017-07-04 Thread william degnan via cctalk
> > > > > 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 > serial > > to enable a systematic comparison > > Let me find the one I wrote, and upload it. > > Noel > I have a 9301-YB and

Re: M9301-YB ROM flaky

2017-07-04 Thread Noel Chiappa via cctalk
> 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 serial port. > would you consider it reliable? Reasonably. If there was bit-rot in

Re: M9301-YB ROM flaky

2017-07-04 Thread Mattis Lind via cctalk
> > > 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.

M9301-YB ROM flaky

2017-07-04 Thread Fritz Mueller via cctalk
Hi folks, 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