test-drb

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101090 discussions

by jnc＠mercury.lcs.mit.edu

> From: Josh Dersch > the plastic "ball on post" brackets PS: Apparently the 'official' DEC name for the 'ball on post' plastic brackets is "latch molding". Not very descriptive/apt, alas. Noel

8 years, 8 months

Extra chips in PDP11/23 plus cpu board

by dj.taylor4＠comcast.net

There is a CPU board for sale on ebay, M8189, and it has the usual 3 chips CPU, MMU, FPU.? However, there are 2 extra chips and I've never seen that before. Anyone know what this is? Ebay item 122867114663? - Vintage Mint Digital DEC M8189 CPU Module Board KDF11-B Doug

8 years, 8 months

DEC indicator panel mounting details

by jnc＠mercury.lcs.mit.edu

> From: Josh Dersch > See the pictures at the below link: ... > Hope this is the right assembly for you Yes, those are _exactly_ what we're looking for. Thanks very much for taking the time to take those! Noel

8 years, 8 months

DEC indicator panel mounting details

by jnc＠mercury.lcs.mit.edu

So, Dave and I are getting to the point where we're about to start mounting up our indicator panels, but we're not sure what some of the mechanical details (below) are. Could someone who has one please take a look and let us know (or, even better, send us photos)? It appears that the bezel and inlay mount to the rack with the same kind of 'ball on post' (BoP) mounting things used for blank panels. What we can't quite make out is how the Belenex light shield, and the circuit board with the bulbs on it, mount to the rack. I suspect it's totally independent from the mounting of the BoP mounting devices for the bezel/inlay, but.... The one mechanical drawing we have (RF11 engineering drawings, pg. 186) does have cross-sections, which confirm the board is mounted to the Benelex on stand-offs, and that the Benelex is somehow thrust up into the bezel, but exactly how the Benelex is mounted is not clear to me. The mention of a "Mtg Bkt Benelex" suggests that's mounted to the rack with brackets, but... Help!? Thanks (hopefully :-)! Noel

8 years, 8 months

WTB: M8360 Omnibus Data Break Interface

by chd＠chdickman.com

Does anyone have a M8360 they are willing to part with? Let me know offline. -chuck

8 years, 8 months

MicroVAX I Diagnostic floppies

by derschjo＠gmail.com

Hi all -- I'm attempting to resurrect a MicroVAX I (because it's there, that's why) and the CPU appears to have developed a fault. Microverify passes at powerup, but I can't get VMS to boot (it dies with a SYSBOOT-F-Unexpected Machine Check almost immediately). Also tried Ultrix and it dies shortly after enumerating disks. I know the memory and disk controllers are fine, and there's nothing else in the system at the moment, so unless anyone has any bright ideas, I think I'm going to need to debug the CPU. I'm trying to track down the diagnostics for this machine, no luck so far. Anyone have a copy sitting around somewhere? I believe there were two RX50 floppies for this purpose, DEC part numbers BL-T856A-DE and BL-T857A-DE. Thanks as always, Josh

8 years, 8 months

XKCD on what we're doing

by paulkoning＠comcast.net

https://xkcd.com/1909/ Our community isn't just about that, but it's part of what makes us tick. paul

8 years, 9 months

IBM 3480 DEC TKZ60 inquiry

by cclist＠sydex.com

Hi Folks, We've got a Canadian customer with what appears to be an IBM 3480 cartridge that he'd like to get the data from. We don't get nearly enough request for these IBM carts to make owning a unit a viable proposition. I understand that the 3480 format was supported by a wide range of vendors, including DEC with the TKZ60/TKZ61. Anyone having one of these drive want to make some easy money? FWIW, the customer thinks that it's a lot older than it really is--he thinks this dates to the 1970s and the S/360, so some gentle advice may also be required. If you're interested, drop me a private email and I'll hook you up. Cheers, Chuck

8 years, 9 months

eBay: MEMOREX 3693-2 & 3690-2 Disc Drive Mainframe IBM 3370-2 VINTAGE

by jnc＠mercury.lcs.mit.edu

> From: Guy Sotomayor Jr > I *really* want them and I'm within an hour (usually) of where they > are. The problem is that right now I'm on a business trip until the end > of the month and he needs this gone prior to 12/31. Why don't you reach out to the person and tell them you _really_ want them, maybe they'll be able to let it go until you get back? Or is there someone in the Sacramanto area who can pick them up and hold them until Guy can get them? I would offer to, but I'm on the wrong coast.... :-( Noel

8 years, 9 months

Odd Connections to Rectifier?

by robert.jarratt＠ntlworld.com

I am reverse engineering the schematic for the input stage of my H7862 PSU. I have come across a KBU6J bridge rectifier which seems to be connected only to the two middle pins, which are the AC inputs. I can't see any other connections. Before I desolder it to verify there are no connections I can't see, does this make any sense? Thanks Rob

8 years, 9 months

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