test-drb March 2016

test-drb@ccmp.vtda.org

189 participants
229 discussions

by Corey.Cohen＠ca.com

I'm trying to troubleshoot a TI silent 743/745. When you press the "rubout" key should it print anything like an underscore? Besides sending the rubout character, what does the actual print head do? Backup? Print an underscore? Thanks, Corey corey cohen u??o? ???o? Mobile: +1 917 747 1408<tel:+1%20917%20747%201408>

8 years, 1 month

Looking for I/O specs HP 9000/236 - 9836CU

by pete＠petelancashire.com

I just acquired one of the guys w/o a display Looking for the spec's of the display connector. I have what I believe to be the pinout but nothing on timing, scan rates, levels etc. Other identification on the thing is "1 MB Board internal set as 1st Card" Upgraded to 9836CU NO BATT / DOES NOT START / BOOT ? Model ID tag 9836C / 2210A01010 -pete

8 years, 1 month

Resistor/Fuse replacement (DEC H7104-D)

by jnc＠mercury.lcs.mit.edu

> From: Josh Dersch > I have no excuse, I just get nervous working on these things. I should hope you do get nervous! Anytime one is working around equipment that contains lethal voltages, one _should_ be nervous! It helps with... > I suppose eventually I'll get used to it. Don't get too used to it, one wants to always be aware and cautious! (I myself am missing half a nail - and I'm lucky that's all that's missing - because I got too "used to" working with my table saw...) Noel

8 years, 1 month

Andy Grove dies

by c.murray.mccullough＠gmail.com

Andrew Grove, co-founder of INTEL, passed away.Truly a giant of our industry. He made possible, or promoted, the brains and memory chips that drive our machines, old and new.

8 years, 1 month

Anyone want some Polymorphic 88 manuals and disks?

by ben＠bensinclair.com

I had a Poly 8813, and just found that I still have the System 88 User's Manual, including the Macro 88 manual, schematics, and 16K RAM manual/schematics. I also have some disks that came with the system, though their status is unknown. I believe many of them were just blank, but there is some system software and a general ledger program disk. Anyone want these? The manuals seem to be readily available online already. -- Ben Sinclair ben at bensinclair.com

8 years, 1 month

Restoring Nylon parts (like the card guides in a PDP-8a chassis)

by dpi＠dustyoldcomputers.com

A friend mentioned that there was a thread about the card guides in an 8a or 8e chassis but I was unable to locate it so I am posting this as a new thread as it has more relevance than just specifically those card guides. Nylon is hygroscopic. Hygroscopic means it has the ability to absorbs water. As nylon ages it drys out. When nylon dries out it shrinks and it becomes brittle. If a nylon part has not yet cracked or been damaged by UV it can be restored to almost like new simply by boiling it in water for 15 to 20 minutes. Boiling will force water back into the material and it will expand and soften. Do not use a pan with a ceramic type of non stick coating. I almost ruined a 10" skillet because it imparted a flavor to the coating which then transferred to the food cooked in the skillet. I don't know what effect microwaves would have on the Nylon matrix so I suggest you just use something like a Corning Ware ceramic glass pan on your range. I was able to restore almost all the unbroken card guides on my 8a. A couple of them had taken on a permanent bend due to excessive shrinkage. Some had broken pins. A few of the pieces expanded too much and you could plug them into the chassis but they bowed away from the edge because they had lengthened beyond original length. Waiting a few weeks allowed them to dry out a little and shrink and restored them to original size. Unfortunately there are no adhesives that will adhere to nylon long term so it is not possible to repair broken nylon parts in a usable manner. Nylon while cheap and easy to injection mold was probably not the best choice for card guides. But then who would ever have expected these machines to still be coveted 40 years after manufacture. -- Doug Ingraham PDP-8 SN 1175

8 years, 1 month

RSX11S

by mattislind＠gmail.com

While archiving a bunch of old 8 inch disks I found disks that apparently contain an old RSX11S system. I think it has been used in some kind of railroad CTC system. https://dl.dropboxusercontent.com/u/96935524/Datormusuem/PDP11RX01DISKS/DIS… It is possible to boot this image in SimH (when setting CPU type to 11/03, 11/23 (F11), 11/34 or 11/73 (J11) ) I get this: sim> b rx0 XDT: 18 XDT>g RSX-11S V02 BL18 DEVICE TT01: NOT IN CONFIGURATION DEVICE FT00: NOT IN CONFIGURATION >a MCR -- 1 >b MCR -- 1 >ccc MCR -- 1 > So first there is a XDT> prompt. By pressing g or p it starts RSX11S. But it seems to be possible to do other things. Commands like "s" and "l" do stuff "x" causes: XDT>x SYSTEM CRASH AT LOCATION 025276 REGISTERS R0=000000 R1=177170 R2=003403 R3=157000 R4=012422 R5=000002 SP=157004 PS=000340 SYSTEM STACK DUMP LOCATION CONTENTS 157004 157150 HALT instruction, PC: 000572 (MOVB #15,R2) sim> I understand that RSX11S is a scaled down version of RSX11M. An embedded RTOS of that day. But what kind of commands are possible at the XDT and MCR(?) prompts. I am a little bit curious to understand more about the system that it has been running. /Mattis

8 years, 1 month

Andrew S.Grove 1936-2016

by spedraja＠gmail.com

https://newsroom.intel.com/news-releases/andrew-s-grove-1936-2016/?utm_cont… Gracias | Regards - Saludos | Greetings | Freundliche Gr??e | Salutations ? -- *Sergio Pedraja* -- twitter: @sergio_pedraja | skype: Sergio Pedraja -- http://plus.google.com/u/0/101292256663392735405 http://www.linkedin.com/in/sergiopedraja ----- No crea todo lo que ve, ni crea que est? vi?ndolo todo

8 years, 1 month

Baydel Unibus disk systems

by tmfdmike＠gmail.com

Folks, I've found something I forgot I had; a Baydel Unibus disk controller. At one time I had 3 or 4 of these in complete systems but carelessly managed to trade them all away(!) - except this one board. They were all identical; a pdp-11/04 with a quad Unibus Baydel disk controller hooked up to an 8" hard drive in a separate rack mount. In use the Baydel subsystem emulated multiple RK05s. The part number on the board is B01061. Unusually Google seems to be utterly silent on the subject; it seems Baydel and these products have slipped beneath the digital waves without trace. Does anyone have any information? I just have the controller board; I don't have any of the hard drives left. All I remember is the disk was an 8" and the interface is a single 40-pin cable; so not SMD and not SCSI. Far too early for IDE or ATA. Any suggestions for what the interface might have been and what disks might have been used? What hard disks were around in late 70s / early 80s that used a single 40-pin connector?? Thanks Mike http://www.corestore.org 'No greater love hath a man than he lay down his life for his brother. Not for millions, not for glory, not for fame. For one person, in the dark, where no one will ever know or see.'

8 years, 1 month

Andy Grove passed away last night

by curiousmarc3＠gmail.com

>From the CHM: "Dear all, The museum is remembering Andy S. Grove, who passed away last night. Please read David C. Brock?s timely blog post this evening, http://www.computerhistory.org/atchm/remembering-andy-s-grove/ Best, Kirsten Tashev Vice-President, Collections & Exhibitions Computer History Museum" I met him during my time at Intel, he attended a couple important meetings (acquisitions discussions, company wide technical strategic planning meetings, quarterly meetings). But already in not so good health and not saying much. We sure listened when he spoke up. I remember in particular once when Intel had a really bad quarter because we raised the price of Flash, after misjudging worldwide inventory. We consequently lost a large part of the market to Samsung ? which probably never returned. Most CEOs would have fired the VP, but instead he took the mike and congratulated him for having had the guts to raise prices. We all applauded, but I distinctly remember I wasn't quite sure why... Bless his soul, he brought a company back from the brink of extinction selling RAM at negative margins, to industry dominance in microprocessors with 65% gross margins. That is excessively difficult to do. Marc

8 years, 1 month

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test-drb March 2016