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101090 discussions

BIG ol tektronix scope 555 - need it gone - make an offer

by guykd＠optusnet.com.au

At 08:34 AM 11/12/2018 -0800, Marc wrote: >That's a beautiful old scope setup. I have a friend who collects this >stuff but he is very low budget and on the opposite side of the country >like me. Heh. How about 'no budget, and opposite side of the world'? Do I win?

7 years, 8 months

Genrad 2511 Vibration Control System

by aek＠bitsavers.org

bought this on eBay suspecting it was LSI-11 based because of the floppies labeled DY: https://www.ebay.com/itm//192437124163 It's kinda neat, has a very late (1989) AED WINC-05 disk controller in it, 11/73 and a bunch of custom daq boards. It also has a Dilog Qbus to Unibus converter (didn't even know they made one) and it appears all the custom boards are on the Unibus. I doubt I'll ever find docs for it though.

7 years, 8 months

anyone seen this 11/70 panel on epay?

by tdk.knight＠gmail.com

iust noticed this apear on ebay if anyones looking for a 11/70 front panel https://www.ebay.ca/itm/Vintage-DEC-PDP-11-70-DataSystem-570-Computer-Front…

7 years, 8 months

BIG ol tektronix scope 555 - need it gone - make an offer

by lyokoboy0＠gmail.com

More of a computer list I know, but I need to clean out and this needs to go soon. Big ol tektronix scope on a cart. Was part of a community workshop, i cleared out all their equipment and have not had the time to repair it. I was planning to go over it and put it to work at my desk, but i decided to get a bigger desk and don't have the space for it. i picked up a hp logic analyzer that fits on the desk, and is more than capable for working on my pdp 11 and other minicomputer stuff. open to offers, come pick it up and its yours. https://i.postimg.cc/NFPC5cDG/scope-555.jpg located in Melbourne FL --Devin D.

7 years, 8 months

cctalk Digest, Vol 51, Issue 10

by technoid6502＠gmail.com

Yes. Sunos 5.4, Solaris 2.4. I got and installed Solaris 2.6 to replace that, iirc. I also ran Netbsd and OpenBsd on that machine, preferring OpenBSD, iirc the video drivers worked best on the frambuffer I had which was the base model color board. This all happened in the year 2000 or thereabouts. Jeff

7 years, 8 months

GCC for pdp11

by paulkoning＠comcast.net

Gentlepeople, Once in a while people ask about GCC. It has long had pdp11 support, but it hasn't received much attention. Recently I've done some cleanup on it, and some more is in the pipeline. One notable new feature is that it can now produce proper DEC Macro-11 syntax output. It has long had a -mdec-asm switch, but that used to produce GNU output. Now it produces DEC output (and -mgnu-asm is how you get output for "gas".) The optimizer is better, and a bunch of compiler failures are fixed. Undoubtedly there are more bugs to be worked on. Oh yes, for grins I told GCC to build not just a C compiler but a C++ and Fortran compiler as well. That seems to work (but I get an error building the libstdc++ library). I now have C++ translations of the RSTS standard header files common.mac and kernel.mac, and the DECnet definitions in netdef.sml. :-) If anyone wants to give this a try, the best way is to get the current code via Subversion (see gcc.gnu.org for details). Alternatively, get a weekly snapshot; the DEC support is in the current latest, though some optimizer work will appear in the next one. paul

7 years, 8 months

Documation TM200 card reader - pinch roller restoration

by guykd＠optusnet.com.au

A quick update. Thanks to those who sent pics of intact rollers. Derived from those the correct pinch roller diameter is 27.20 mm. Notes here: http://everist.org/NobLog/20180922_data_in_holes.htm#rub It seems there's a few people who need new M200 rollers. Once/if I perfect a successful method of making replacements I'll offer them for postage and a few dollars. But I'm in Australia. Or, there's this guy in the USA: http://www.terrysrubberrollers.com/ Now the correct OD is known he's an alternative, with real rubber. (Maybe my end result will be rubber too. That remains to be seen.) I still haven't found a service manual for the TM200 (with schematics.) Guy

7 years, 8 months

Seeking info for Cardamation parallel-serial board for card reader

by ethan.dicks＠gmail.com

I have finally begun working with the card reader I picked up at a VCF some years back. Mechanically, it's sound, and the rollers are adequate for short term use (on the top, one is firm and in good shape, the other is starting the slide to goo but is working well enough for short-term testing). Mine came with a Cardamation-badged microprocessor board inside that's a serial converter and so far, I'm not getting any bits out of it. I am fairly certain that the product I have was sold as a Cardamation CF-600 based on pictures and speed. I found this on the Wayback Machine: https://web.archive.org/web/20111003183529/http://www.cardamation.com/cardr… The board in question has a 6802 processor, two 6821 PIA chips for the parallel interface, an EPROM, 1K of 2114 SRAM, an 8250 UART, and some misc parts for an RS-232 level shifter. Looking at the DB25F, there are no bits coming out of pin 2 or pin 3. I have yet to sit down and trace signals all the way back, but it may come to that. To assist my probings, while I can reverse-engineer the schematic, locating any docs would speed up this process greatly. On the board, there are markings that indicate it's a "Cardamation Feature 92 Rev 4 Assy No 023.0096-9". The EPROM has a paper label indicating that it's programmed with "V793NE76" whatever that means (likely the variations are largely centered around what EBCDIC-to-ASCII mapping was required). I will be dumping the EPROM to ensure it has sensible contents. Additionally, I'm always suspicious of 2114 SRAMs. They fail while sitting on the shelf. Fortunately everything is socketed, so even if it's an EIA line driver or a PIA or UART or even the CPU, replacement is trivial. There are no unobtanium parts on this outside of the programming of the EPROM. Absolutely worse case, I remove this serial interface and build my own with a modern MCU (I believe Kyle Owen has recently done this). If this was 10 years ago, I'd probably start with Cardamation to ask if they still had any docs on this stuff. I'm reading they closed up shop in 2011 so that's not an option. Digging around for old Cardamation articles in trade rags, I see one of their 300 card-per-minute units spewing the data at 19.2Kbps (I did try that speed, along with 38.4Kbps). I think the minimum speed is going to be 9600 bps, but as I'm not seeing any bits on an oscilliscope, I'm sure it's not the settings on the receive side (yet). -ethan

7 years, 8 months

PDP-8/e rebuild - update.

by rodsmallwood52＠btinternet.com

Went to toggle in the RIM loader ? huh ! Memory address 04 stuck low. So either try another 4k core (after changing the jumpers) or... Trace the signal path. What do we think? Rod Sent from Mail for Windows 10

7 years, 8 months

chasing down an old game

by iain＠csp-partnership.co.uk

Many many years ago in a distant galaxy (called Strathclyde University Computer Science) we ran a game on the PDPs. It was great at testing out terminal line speed handing and debugging curses (well that is what we told the bosses). I remember the game as being called ?search?. But since we had the source code it could have been anything. It was played on 24 x 80 dumb terminals. It was multi user. In the game you moved around the universe in your craft - the display was a kind of 3-D picture (you got closer to a plant and the planet got bigger - try drawing increasing circles on a 24x80!). You could travel through the universe shooting other craft (friend of foe). The only craft name I think I remember is ?shankers? - becuase we had source a lot of the craft names turned into locally relevant names. You could team up with other players and (1 line) communication with a group or with that player. I have searched (on and off) for the game. I cant find anything like it. I would like it to test out the DZ cards on my PDP! - OK that is my excuse ;-) Is anybody aware of what I am talking about? Does anyone have any old code anywhere? Aye, it was not as good as the old GT40 - but it was a different era.

7 years, 8 months

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