test-drb November 2020

test-drb@ccmp.vtda.org

114 participants
70 discussions

by w2hx＠w2hx.com

For you folks that work on machines with VGA monitors. https://www.mpja.com/11-16-20.asp?r=344017&s=2 I don't own one but it seemed interesting enough to pass on. 73 Eugene W2HX

4 years, 1 month

WTB: Amiga 8375 Agnus IC (NTSC or PAL) or Amiga 600 motherboard

by ethan＠757.org

Looking for an Amiga 8375 Agnus IC (Amiga 600, Amiga 500 Plus.) NTSC is what I have now but the PAL version might work. Also interested in an Amiga 600 motherboard, can deal with it if bad caps and cap damage. Thanks -- : Ethan O'Toole

4 years, 1 month

Seagate Elite "reverse surging" noise

by jules.richardson99＠gmail.com

I picked up a couple of 9GB Seagate Elite SCSI disks the other day (model 410800N, 1995-vintage but 5.25" FH units). Both drives spin up, both pass r/w tests successfully. On one unit, the spindle motor sound is constant. On the other, however, it makes a sound that I can best describe as "reverse surging", where every 5 seconds or thereabouts there's a very brief lowering in tone before the "normal" sound resumes. Anyone familiar with the Elite range know if "some of them just do that", or if it's likely to be some form of fault (which may only get worse)? I've never encountered a disk which does this before; my ear's not detecting any kind of speed increase prior to the decrease (and I don't know if that's what's really going on or not), but that's what my brain wants to think is happening. However, if the speed really was fluctuating to the point that I could hear it then I'm surprised that I'm not getting read/write problems. cheers Jules

4 years, 1 month

TU58 dumps. Mostly VAX 11/750 AND 11/730 diags and console tapes.

by mattislind＠gmail.com

I dumped almost 50 TU58 tapes. They were given to me by an ex DEC FS engineer. Most of them are various 11/750 diagnostics. The tapes or not the official DEC TU58 tapes but home brewed tapes used in FS so there might not be an exact match to existing lists of official tapes. But they might be useful anyhow. I have seen diags for CI 750, DW750, RH750, DT07, Various Ethernet, UDA50, TK50, DZ32, DMF32, DH11 and some more standard 11/750 MIC, DPM tests and instruction tests. Then there were some 11/730 tapes. Console and two diag tapes. I collected everything in a google-drive-folder https://drive.google.com/drive/folders/1CkcXVJS9aJDwD4ihdj27QYcgkm7gEdrQ?us… This folder also contains some older dumps I have done. Both DECtape and DECtape II. All dumps are aggregated into a document trying to give a hint on what the dump contains. Beware that some dumps failed to read correctly and are just partial. But it should hopefully be clear from the file size. https://docs.google.com/document/d/1vD8erJM-HitSd4kRXt6_Rzl403HDoprr08EY69u… /Mattis

4 years, 1 month

Floppy pressure pad replacement?

by deramp5113＠yahoo.com

I?ve got some adhesive backed industrial felt that I punch with a leather punch. I?ve replaced many of those pads on 8? and 5.25? drives and the felt pad works well. Shoot me an email and I can send you a few pads if you need. Mike

4 years, 1 month

Looking for Console MUX cable for HP E45

by rp＠servium.ch

I recently acquired a HP 9000 E45. Unfortunately, it came without the console MUX panel and cable. I was lucky to find an ADP II (5062-3054) in my "pile of useful stuff", but sadly, the 78pin to DB9 cable is missing. The part number of the cable is 5060-3074 though there might be others that work (5062-3074 is mentioned a few times in the HP forums, but not in the manual so I'm not 100% certain it's the right cable). Does anyone have a spare cable or an ADP or DDP with the cable they would let go for a reasonable price? Or have one and could tell me which 9 out of those 78 pins go where on the DB9 connector? thanks Rico

4 years, 1 month

Wanted: listing RIPL ROS IBM3705 or Amdahl4705

by h.j.stegeman＠hccnet.nl

Hi all, I searching for a scan or copy of the ROS listing of a IBM 3705 or Amdahl 4705 REMOTE. I all ready have the local single- and multi-channel attached versions, but still missing the remote one. Anyone who can? help me ? Thanks Regards Henk www.ibmsystem3.nl

4 years, 1 month

Microvax 3100 VMS 7.3 password reset

by athornton＠gmail.com

I for one was thrilled to see that there will be x86_64 hobbyist licenses for VMS. I have an emulated VAX on a Raspberry Pi (I don?t know if my 11/730 works, but I doubt it?it?s nowhere near a 220V power supply and it?s not been much of a priority, and I have a VAXStation 3100 that doesn?t pass POST even with a freshly-burned ROM) running OpenVMS 7.3, and a real AlphaServer 800 running 8.4. I mean obviously the NEXT thing to do is start bugging VSI for ARM support?given that the OS runs on VAX, Alpha, Itanic, and x86_64, how much really crucial and hard-to-port assembly can be left in it??and given the way datacenters are trending, it might not even be a commercially stupid move. I want to run VMS on my phone (or my next Mac). Doesn?t everyone? Adam

4 years, 1 month

Next project: 11/24. Does it need memory?

by jnc＠mercury.lcs.mit.edu

> From: Jay Jaeger >> 2--M7134 KT24 Memory map > M7891 UNIBUS Memory (256K, I think, presumably addressed for 0). If that's all the memory you have, the KT24 isn't really doing anything (well, monitoring power; holding boot PROM's; etc). Is your MS11-L configured to be EUB memory, then? If no KT24 is plugged in, the CPU detects that there isn't one there, and permanently, statically maps the UNIBUS straight across to the bottom 256KB of EUB space. (Presumably a low-cost option for the /24.) Although the 'straight across' mapping only applies to UNIBUS->EUB cycles, not EUB->UNIBUS cycles, such as those from the CPU; but the TM says [pg 2-31 in the 003 version] that if E124-S6 is OFF, "the lower 18 bits of every address go to the UNIBUS", which implies that when OFF, UNIBUS memory appears at 0 in the CPU's address space. So it should work as UNIBUS memory, with E124-S6 OFF; it would be interesting to verify that. The TM also says (pg. 2-40) "systems with UNIBUS memory ... require changes to be made to the mapping jumpers [on the KT24]". > Let me know if you want me to go thru the process of > .. > 2) Pull the boards and document What kind of box is your -11/24 in, a BA11-A, or BA11-L? If the latter, I'd be really grateful for some closeups of the interior, so I can put mine back together, and do some of these experiments. (Yes, yes, I know I should have taken pictures before I took it apart; I was just starting, and was going by how we used to do things, back before there were digital cameras.) I could probably work it out by staring hard, and thinking harder, along with the prints, but photos would be a lot easier! :-) If it's a BA11-A, I'm still trying to get an image of the special power adapter used to turn the bus bar of the BA11-A into the 6/15 pin Mate-N-Lok connectors used by the -11/24 backplane. Noel

4 years, 1 month

VT-320 interfacing

by retrojoe＠stateoftheark.ca

Hi All. I've recently come into a really nice VT-320 terminal, but am having a hell of a time getting it to communicate with the outside world (mainly my PiDP-8 and PiDP-11). I've gone to the lowest common denominator, using a USB serial cable and terminal software to verify everything is working before digging into making simh output to a serial terminal. The VT320 only has the DEC-423 MMJ, no RS-232. I found a number of guides that show how to wire up the DEC-423 connector to a DB-9 RS-232, but so far I have struck out. It will receive text from the remote computer, but I do not see anything on the remote when I type on the VT-320. I have loop backed the TX to RX on the VT-320 terminal, and it does work. TX=RX Baud rate? in the VT320 settings, and the data bits, parity, & stop bits match. DEC-423 (lock tab bottom right, pin one on the left, 6 on the right) 1??? DTR 2??? TXD 3??? TXD- 4??? RXD- 5??? RXD 6??? DSR For a cross over cable: 423 #2 goes to DB9 #2 (TX to RX) 423 #3 & #4 to DB9 #5 (TXD- and RXD- to GND) 423 #5 goes to DB9 #3 (RX to TX) 423 #1 to DB9 #6 (DTR to DSR) 423 #6 to DB9 #4 (DSR to DTR) Does this look like it should work? It does leave DB9 RTS and CTS unconnected. Thanks!

4 years, 1 month

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test-drb November 2020