test-drb April 2015

test-drb@ccmp.vtda.org

182 participants
220 discussions

by b4＠gewt.net

Hey all, Should be a bit less silent now I guess. ;) Anyone here exceptionally familiar with the SC-40? I've completed imaging the drive (just microcode and diags, someone want to finish reversing it for use in klh10?) and doing the inspection (actually finished weeks ago but got busy) Now, I have a tape drive working and attached to it via SCSI...however now I'm lacking info on how to actually do a tape bootstrap. ;) http://i.imgur.com/gatos9o.jpg -- Cory Smelosky http://gewt.net Personal stuff http://gimme-sympathy.org Projects

9 years

ACT, CIT, COMPUTER CONSOLES, DATA PRODUCTS, DPD, SIMPACT, PERTEC, VERSATEC

by useddec＠gmail.com

Here are some hex DEC compatible boards that I just found. If you wish to make an offer, please contact me off list. Thanks, Paul ACT 10103-0, 10104 ON BACK COMPUTER INTERFACE TECNOLOGY CM7819 =DZ11? COMPUTER CONSOLES 34D01533 DATA PRODUCTS 257240, 257345 SERIAL INTERFACES DPD FPPA-24132M03 PERTEC GCR/PE READ 107856-02, GCR/PR READ 107861-01AN DEC # 29-23763-00 107866-01 DEC # 29-23769-00 SIMPACT ICP-1600 VERSATEC BIPOLAR ALGORITHM PROCESSOR 382441

9 years

Does anyone here have any information/docs on the Tahoe aka Power 6/32 aka Harris HCX-7/9?

by krfkeith＠gmail.com

I've checked Bitsavers. Computer Consoles Inc doesn't appear to have a presence there, and there's nothing in the Harris or ICL sections (two rebadgers). Anyone information you guys might have on this machine would be much appreciated. -- Thanks, Kevin

9 years

Manual sought - Northern Telecom Spectron D101

by jwest＠classiccmp.org

I had written ---- TSIA I?m in need of an owner?s manual (and ideally, a service manual as well would be nice) for? a Northern Telecom Spectron D101. This is an RS232 serial datascope, basically a line monitor with some programmability (displays in binary, hex, ascii, or octal; start tracking on certain characters; substitute X string for Y string; etc.). I?ve googled excessively with no results, and also reached out to AEK. Any chance someone has one in their pile? ---- FYI, after posting the above I did yet another round of google searches and this time a manual popped up as the very first search result. Odd. Manual purchased, and I'll copy and send off to Al if he wants it for bitsavers. J

9 years

Wanted: ASM-48 for Intellec MDS-2

by jnc＠mercury.lcs.mit.edu

> From: F. Ulivi > I hope I'm not "offending" anyone in this forum by mentioning an > emulator, it looks like you are mostly focused on real (vintage) > hardware.. Absolutely not! Although we do indeed focus on vintage hardware, I think we all understand how useful emulators can be, and many (most? all?) of us use them as a useful partner to our old hardware. I certainly do! (If nothing else, they tend to run a lot faster than the actual machines do! :-) Noel

9 years

Tektronix 4014-1 troubleshooting advice

by jnc＠mercury.lcs.mit.edu

> From: Josh Dersch > I finished restoring the 4014's power supply So I'm curiuous; what exactly did you do, in restoring the supply? (Given that you'd previously already turned the unit on, and discovered this behaviour?) Just adjust voltages to spec, or more than that? Noel

9 years

Tektronix 4014-1 troubleshooting advice

by derschjo＠gmail.com

Hi all -- Picked up a Tektronix 4014-1 terminal. It's in pretty good shape, nice and clean and it's in nearly-working condition except that the storage behavior isn't quite right. On power-up, write-through doesn't. (That is, characters don't get stored to the tube.) Clearing the display via the RESET/PAGE key clears a roughly elliptical region in the center of the display but leaves the outer edges a mess. The cleared region stores characters properly. You can see the overall effect here: http://yahozna.dyndns.org/scratch/tek4014/clear.jpg After a 2-3 minutes of warming up the area cleared by RESET/PAGE increases. I haven't run the terminal long enough to see if it eventually completely erases the screen (while the power supply appears to be within tolerances, I still need to rebuild/reform it so I'm not going to run it too long yet). So far everything else seems to be functioning properly, the cursor appears properly (and does not write through), input is accepted from the keyboard, etc. I've been reading through the service manual on Bitsavers and it describes a very in-depth alignment procedure which I'm prepared to go through (once I've got the power supplies rebuilt) but I thought I'd ask here if this problem rings any bells and if there's anything I should immediately suspect or adjust. You guys know everything :). Thanks as always for the advice, Josh

9 years

HP-85A tape drive conversion

by marc.verdiell＠gmail.com

geneb wrote: >So it looks like he made a little cap over the top - that's a very simple >print. If you can get me dimensions I can print you a few. Yep that's what I did: https://www.youtube.com/watch?v=7IQKCiS0w2s inspiring myself from Rick's drawing (thanks Rick). It's a very small part though, not sure if you can print something that small accurately unless you have a professional printer. The cap I made was 6mm high, 9.6mm in diameter, with a cavity 3mm deep of 6.30mm diameter at the bottom for the capstan to go in. It required me to reduce the original capstan diameter to the 6.30mm so it could fit in the cavity though. That's what I was trying to avoid with my two alternate proposals (for people that don't have a lathe...) Speaking of which >I want his lathe. :) Mwahahaha. Nooooo. It's all miiiiine. Sadly they don't make them anymore, I got one of the last ones. - Marc

9 years

SGI Origin side skins

by jules.richardson99＠gmail.com

Does anyone know how to remove the side skins on an SGI Origin (specifically a 2200 deskside cabinet). The manual mentions removal of the top and front, but says that the sides are more tricky and to contact SGI for the procedure. I'd like to remove them as there's some minor paint splatter on them, which would be much easier to deal with off the machine. I see there's a screw at the bottom of the machine on the rear edge (much like the one for the front which releases the front skin), but removing it doesn't seem to let the rear plastic molding drop in the same way, and I assume this needs to come off first. cheers Jules

9 years

R8000 Re: SGI Indigo2 graphics options

by seefriek＠gmail.com

From: Sean Caron <scaron at umich.edu> > You are right, even the interactive performance of the R8K had me a bit > taken aback...But I understand in its day it really flew on the FP codes; Yup. The R8000 was pretty specifically designed to be a desktop super, for some value of "super". And for 1995, it was pretty remarkable. It was the first superscaler MIPS, and the dedicated FP unit was pretty much pushing the envelope on single chip tech. But integer performance wasn't a priority, and you could tell. > I don't know if this claim was ever really substantiated in the real world The MIPSPro compilers usually did a really good job of optimizing for the R8000, and for the jobs it was designed for (non-vectorizable floating point) it really flew (300ish MFLOPS...which for 1995 was nothing short of amazing in a desktop). I would note, however, that the common comparison to the Y/MP is pretty much pure marketing. The Y/MP and the R8K were on-par for non-vector FP problems, but as soon as the compiler could substantially vectorize the problem, the Y/MP could be many times faster than the R8K for the same codebase. In the end, we found the R8K was a nice dev machine (due to a good bit of source compatibility between the MIPSPro and Cray compilers), but not generally cost effective, and pretty much outmatched all around by the R10k and later. > But it's a neat little oddball Very. KJ

9 years

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test-drb April 2015