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101090 discussions

Deciphering PDP-11/05 ZQKC (Instruction Exerciser) MAINDEC failures...

by derschjo＠gmail.com

Hi all - As noted in a mail last week, I now have my PDP-11/05 running with working core (8KW). I had some time last night to try loading in some "real" software, and I started with the PDP-11 paper-tape BASIC, which I've successfully loaded into memory (in theory). At this point, it became clear that there's still an issue or two to iron out in the CPU; BASIC behaves extremely erratically, spewing random error messages, listing garbage, and corrupting itself and crashing pretty quickly. I'd run the memory exerciser MAINDECs previously (and I ran them again for good measure) and there are no obvious issues with the memory. The system exerciser diagnostic (ZQKB) passes, but the "11 family instruction exerciser" (ZQKC) fails after a minute or so at PC=016014. I have the listing for the diagnostic (though I'm not precisely sure whether it's exactly the same revision) from here: http://bitsavers.trailing-edge.com/pdf/dec/pdp11/xxdp/diag_listings/MAINDEC… The doc is pretty grainy but the code at 016012 doesn't actually seem to match what I've got in memory (I disabled relocation in the test just to be sure things didn't get moved around) and there's no failure check at that particular point in memory either. I've tried the paper-tape images from Bitsavers as well as the ones on the XXDP RL02 images floating around out there and they all yield the same results; I suppose it's possible the CPU is failing in such a way as to make the test reporting incorrect but it seems more likely that (a) I have an outdated listing or (b) I'm misinterpreting the results somehow. Anyone have any experience with this particular diagnostic? Thanks, Josh

10 years, 2 months

MCBA COBOL/DIBOL App Docs

by silent700＠gmail.com

Oh dear, look at all this COBOL (and DIBOL, too.) This is pretty dry stuff, folks. But there isn't much out there from this vendor, so here it is: http://chiclassiccomp.org/docs/index.php?dir=%2Fcomputing/MCBA Free to add to your collection, as always. I have some 9-track tapes that may or may not contain some MCBA software, as well, which I'll get to someday. -j

10 years, 2 months

HP 7914

by jwest＠classiccmp.org

I have a board from a HP 7914 disc drive (07914-60001). No clue how I obtained it, as I've never owned a 7914 (but did have a hard luck case 7912, which is long gone). In any case... free for shipping if anyone wants it. J

10 years, 2 months

Front Panel Orders - Special Update

by rodsmallwood52＠btinternet.com

Hi Guys Well the original panel arrived yesterday and revealed one or two interesting features. It was from an 8/m but as the underlying programmers console (apart from the change from bulb to LED) is the same for all of versions I am making. Its a good example What it reveals was that they silk screened the panel first then routed or milled out the openings using the markings as a guide. This is the source of much complained of chipping and peeling. This means that they did not have to be too fussy with the placement of the silk screening in relation to the edges of the blank. Any small offset would be hidden by the bezel anyway. in addition there is plenty of tolerance on the key lock - there's provision to adjust its position on the mounting. The hole for the select switch is drilled over size (0.38" for a 0.25" shaft) so more room to move things about In the spirit of "measure twice and cut once" would all those with orders please do the following. Take off the selector switch knob. Remove the bezel and take the old front panel out. Measure from the bottom edge of the panel to the bottom of the row of switch openings. Then from the left hand side to the first switch opening. Finally from the right hand side to the last switch opening. Please send the three measurements with the type of system its off plus any part numbers on the back of the panel to me. Regards Rod

10 years, 2 months

Could someone make this topic go away?

by rickb＠bensene.com

I'm sick of this junk. Let's get back to writing about real computers rather than arguing over how the lists should work. Sheesh. -Rick

10 years, 2 months

MicroVAX 3100, DECservers, etc. available for a couple days

by jim＠deitygraveyard.com

Just saw this on the rescue list. I *believe* the location would be North Carolina, US. E-mail them, not me. ---------- Forwarded message ---------- From: Lenore Ramm via TriLUG <trilug at trilug.org> Date: Thu, Nov 19, 2015 at 8:20 PM Subject: [TriLUG] Vintage Hardware (Everything Must Go NOW!) To: Triangle Linux Users Group General Discussion <trilug at trilug.org> A friend and former TriLUG member is looking for a new home for the MicroVAX 3100 and associated hardware. It lacks drives. It needs to be given away to whomever is willing to take it. The lot includes the drive-less VAX, one DECserver 300, two DECserver 200/MC, a tape drive, and a few other related bits, as pictured in the links below. If you are interested, you must meet to pick it up or provide funds for shipping, before it gets recycled in the next few days. If you are interested, email me (lenore.ramm at gmail.com))(*NOW, before it's too late*) and I will provide contact information. There are pics! http://trilug.org/~eronel/decpics It may or may not have a pleasing amber display. Lenore

10 years, 2 months

Query for dec teleprinter roms

by COURYHOUSE＠aol.com

Just a hit . . scanning/printing without having to go to kinkos etc.... to any of you needing something that will print--- nice photos print 11 x 17 scan a tad larger than 11 x 17 fax reasonable price free OCR software built in duplex printing has a bin sheet feeder too for doc size get a hp officejet 7612 I got mine on sale for $160 not a speed demon but a helpful device it is handy. there are times we need to print something larger than legal size for museum displays etc or scan large magazine cover, schematics etc... it has worked well. we use this for pretty much in house use. patrons needing lots of something scanned we have still have to contract with one of our offsite vendors. (shoemakers children analogy etc.) Ed Sharpe archivist for SMECC In a message dated 11/20/2015 12:22:50 P.M. US Mountain Standard Tim, billdegnan at gmail.com writes: > As usual, while looking for something else I finally happened to find the > LA100 > docs and ROMs and I've sent the ROM images to Jonathan separately; the > print set > is 11" x 17" and I'll contact Noel off-list regarding scanning. >

10 years, 2 months

Gene Amdahl, Pioneer of Mainframe Computing, Dies at 92

by stephane.tsacas＠gmail.com

http://www.nytimes.com/2015/11/13/technology/gene-amdahl-pioneer-of-mainfra… -- Stephane

10 years, 2 months

Query for dec teleprinter roms

by jnc＠mercury.lcs.mit.edu

> From: Mike Stein > I don't think I can scan the print set; IIRC the pages were longer > than 14". How much longer? My A3 scanner will take up to 17". I'd be happy to scan them for you (and return them afterwards) if you send them to me. (BTW, this offer is open to everyone/anyone - although if I get 23 sets of prints, please don't expect instant service! Please contact me first.) Noel

10 years, 2 months

Could someone make the list do the [cctalk] thing in the subject line?

by ethan＠757.org

Hello, By any chance could someone configure the mailing list to add [cctalk] or [cc] or [cct] into the beginning of the subject line? Not looking to filter, just not looking to delete messages. -- Ethan O'Toole

10 years, 2 months

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