test-drb February 2019

test-drb@ccmp.vtda.org

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WTB : Card extender for HP 21xx ( Fit from 2116 to 21MX )

by gerardcjat＠free.fr

All is in the title. An other very long shoot, isn't it ? ;-)

5 years, 10 months

Raspberry Pi floppy interface.

by geneb＠deltasoft.com

This looks like a project with a ton of potential for archviving media without having to deal with the asshattery of the kryoflux people. https://github.com/picosonic/bbc-fdc g. -- Proud owner of F-15C 80-0007 http://www.f15sim.com - The only one of its kind. http://www.diy-cockpits.org/coll - Go Collimated or Go Home. Some people collect things for a hobby. Geeks collect hobbies. ScarletDME - The red hot Data Management Environment A Multi-Value database for the masses, not the classes. http://scarlet.deltasoft.com - Get it _today_!

5 years, 10 months

PDP-11/45 RSTS/E boot problem

by jnc＠mercury.lcs.mit.edu

> From: Fritz Mueller > I've had a bit of time in front of the machine to repro this and take a > look. What I actually see is: > R0 177770 > R1 0 > R2 0 > R3 0 > R4 0 > R5 34 > R6 141774 > PC 000254 Argh. (Very red face!) I worked out the trap stack layout by looking at m40.s and trap.c, and totally forgot about the return PC (that's the 0444) from the call to trap(): 0001740 000013 141756 022050 000013 000000 000000 000000 000034 0001760 000444 000031 177760 000000 030351 177770 010210 170010 I clearly should have looked at core(V) in the V6 manual! The R6 you have recorded is correct for just after the trap; that's the kernel mode SP, which points to the top of the kernel stack, in segment 6 (in the swappable per-process kernel area, which runs >from 140000-1776). So there is no R5 mystery, I was just confused. Back to the other two! Noel

5 years, 10 months

PDP-11/45 RSTS/E boot problem

by jnc＠mercury.lcs.mit.edu

> From: Wayne S > it might be a wonky filesystem. ... > The corruption probably came because the entire disk was going bad. This theory is contradicted by the fact (mentioned several times, including in the message you were replying to) that doing a plain 'ls' bombs, but 'sleep 300 &; ls' works fine. Noel

5 years, 10 months

PDP-11/45 RSTS/E boot problem

by jnc＠mercury.lcs.mit.edu

> From: Jay Jaeger > This sort of situation, where DEC diagnostics run OK but UNIX has issues > was reported to be not all that uncommon - to the point where the urban > legend was that some DEC FE's would fire up Unix V6 as a sort of system > exerciser. Amusing! Never heard that; our -11's were never under maintenance, so DEC FE's never worked on them. > Make a copy of ls, and see if the copy also fails It acts just like the original; fails when run by itself, runs OK when 'sleep' is also running (in the background). > From: Bob Smith > We finally had the cpu backplane replaced Ow. Not an option for Fritz, I expect. (I dunno - anyone have a spare /45 backplane?) > From: Paul Koning > Is there any way to attach a logic analyzer to various data paths on > this machine? I had suggested to Fritz that the symptoms led me to believe that it was time to deploy a LA, especially since the MM trap only occurs once between him typing 'ls' and the process failing - i.e. easy to trigger on. He offered me the options of look at the IR or at the UNIBUS - I opted for the IR so we can see _exactly_ what the machine _thinks_ it is doing! No report back yet, though. Noel

5 years, 10 months

PDP-11/45 RSTS/E boot problem

by jnc＠mercury.lcs.mit.edu

> From: Jon Elson > Does the MMU classify what the error condition was Yes, there are a series of bits in SSR0 to indicate the particular error: 'non-resident', 'length', 'read-only', etc (and also the segment number the error's from). As my message mentioned, we're seeing the 'length' error bit on, and for segment 1 (which the instruction isn't using). > is it possible to borrow an MMU from somebody else? Fritz does have a spare board, but it has known errors. We haven't thought about borrowing one yet, it may come to that. > If this fault could be caused by memory Well, _some_ of it could. E.g. if the 'jsr r5, csv' is read as 'jsr r4, csv', dropping the '1' bit in the register number, that would explain the wonky R5 content - R4 does contain the 034 that should be in R5, I have just noticed. But that doesn't explain the bogus MM trap. Although I suppose there could be several different problems, all at the same time. > does this machine have a cache? Nope. Noel

5 years, 10 months

TU-58 support under Unix

by bill.gunshannon＠hotmail.com

Here's a question for someone who has been around long enough to remember. Why did none of the available PDP-11 Unixes support the TU-58? I have looked at Ultrix-11, V7M and BSD 2.11 (didn't try 2.9 but I suspect if it isn't in 2.11 it wasn't in 2.9) and none of them had support for the TU-58. Seems to me it would have been a rather simple device to handle as it ran over a serial line. bill

5 years, 10 months

Looking for Limited Function Board

by pontus＠Update.UU.SE

Hi I'm restoring a PDP-8/a with the help of some friends. The CPU is now passing the MAINDECs I've thrown at it. The memory is a modern semiconductor board my friend Anders Sandahl made. This machine is pieced together from several others and the limited function panel I got does not match the backplane I have. My theory is the DEC simplified the design of the boardto cut costs and simpler design is not compatible. Mine is labeled (on the PCB): "LIMITED FUNCTION BD. 5411507 5011506C-P2" And the one I need is: "LIMITED FUNCTION 5411165 5011167" However, the picture I have of the other is not so good. I may have read the numbera wrong. I would very much like to buy one to finish this project. /P

5 years, 10 months

TU-58 support under Unix

by jnc＠mercury.lcs.mit.edu

> From: Bill Gunshannon > Why did none of the available PDP-11 Unixes support the TU-58? > I have looked at Ultrix-11, V7M and BSD 2.11 The 'TUHS' list might be more likely turn up the reasoning? Noel

5 years, 10 months

Vax sw: Computex Plus

by robert＠irrelevant.com

Hi. Has anybody got a copy of this? It's a viewdata host program. https://www.cbronline.com/news/applied_telematics_adds_minitel_access_from_… Even better would be an installed database.. Ta. Rob. -- Sent from a mobile device. Please excuse brevity or spoiling mistooks.

5 years, 10 months

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test-drb February 2019