test-drb May 2013

test-drb@ccmp.vtda.org

213 participants
253 discussions

by mouse＠Rodents-Montreal.ORG

It's a bit of a long shot, I know, but is there anyone here who knows details of the KA630 (MicroVAX-II CPU) console serial line hardware? My emulator is failing selftest 2 and it appears to be because it's expecting the console serial line to act in some way mine does't. But it's not clear from the code what it's expecting, just that it's obviously different from what I've implemented. In particular, what I see in my instruction trace is: - set stuff up, including putting SLU in loopback - drop IPL - take transmitter-ready interrupt - tell it to transmit a NUL - REI - enter wait loop (with countdown timeout) - take transmitter-ready interrupt, long before countdown expires - do nothing that touches the SLU - REI - take transmitter-ready interrupt again immediately - fail the test But I thought real hardware acted this way: don't clear an interrupt condition and it fires immediately upon REI. So there's clearly something I don't understand going on, hence my question.... /~\ The ASCII Mouse \ / Ribbon Campaign X Against HTML mouse at rodents-montreal.org / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B

12 years, 1 month

My TRS-80 Model 4 on YouTube

by terry＠webweavers.co.nz

My TRS-80 Model 4 stars in its own YouTube video. An all-in-one classic computer. One of my favourite models. http://youtu.be/TjkjIN1pe_A Terry (Tez)

12 years, 1 month

Printer Format Tape Punch

by dave.g4ugm＠gmail.com

Folks, Spotted this on E-Bay UK. Now I am sure I must have worked with printers that used a format tape, but I don't remember a punch... http://www.ebay.co.uk/itm/190837106811 Dave G4UGM

12 years, 1 month

first unix experiences / was Re: [cctalk] Re: An IRIX time capsule...

by nigel.d.williams＠gmail.com

https://www.msu.edu/~mrr/mycomp/terak/termubel.htm Lycklama's MINI-UNIX on an PDP-11/03, early 1980s for my first experience. MINI-UNIX was a cutdown UNIX V6 kernel that operated on a PDP-11 without MMU support, by swapping each process in and out of what little memory remained (12KW for the kernel and 16KW for user space). What made it somewhat usable for us was the very fast optically-positioned Pertec fixed/cartridge disk system (emulated an RK05) we had on the system at the time. It was essentially a single user environment, but the C compiler worked. I think we briefly tried two terminals (ADM3a) just to see if it would work. That experience lead us to later get an LSI-11/23 CPU board and additional memory and start running UNIX V7, and for a brief time we had 12 terminals connected with students able to do a mix of Pascal and simple FORTRAN programs (no one wanted to use C at that stage).

12 years, 1 month

Downsizing - many systems available

by dave13＠dunfield.com

For various reasons I am looking to downsize my classic computer collection over the next few years. The collection can be seen at: www.classiccmp.org/dunfield [Keep trying if it says "service unavailable" - the classiccmp server seems to be having problems lately] Most of the system depicted are available. A few I will keep, a few are already placed, and a few are "on loan" and will be returned to their owners, but most of the systems shown are available (as well as a few which have not been processed yet). If you are interested in one or more systems from my site, please contact me off-list and let me know specifically what you are interested in. All of the equipment is located near Ottawa, Ontario Canada. If anyone is interested in the entire collection, let me know and perhaps we can work something out. If there is serious interest in the whole collection, I can make a detailed inventory of exactly what would be available. Dave -- dave13 (at) Dave Dunfield dunfield System/Firmware development services: www.dunfield.com (dot) com Classic computers: http://www.classiccmp.org/dunfield

12 years, 1 month

Wanted: VR201 and LK201 for DEC Rainbow 100

by lists＠loomcom.com

Hi folks, At a local swap meet this morning, I stumble across a pair of DEC Rainbows. I got both of them for $45! Hey, no comments from the peanut gallery, _I_ think these are collectible anyway :) And they're getting really hard to find, so I'm happy. Unfortunately, as is all too often the case these days neither one had a keyboard or monitor with it. So I'm looking for at least one VR201 monitor and an LK201 keyboard. If you've got any spares floating around please drop me a line. I think they're starting to be unobtanium, which is really too bad. I'm located in the San Francisco Bay Area, by the way. Regards, -Seth

12 years, 1 month

IBM I/O Selectric project

by lawrence＠ljw.me.uk

I've been working on an IBM Selectric typewriter which I bought earlier in the year. It is the I/O Selectric type 735 which differs from a normal Selectric in having the solenoids and switches on it to allow it to be used as a printer and keyboard. When I got it the motor wouldn't run, and the mechanism was jammed. The motor problem was its thermal trip, which is meant to be the resettable type, so I replaced that. I gave the whole thing a clean with degreaser, which freed up the mechanicals, then oiled and greased it. It then worked happily as a typewriter. I have made a small interface, based on an Arduino Mega 2560, which provides a serial port. Currently this only supports printing, but will be extended to include the keyboard. It uses almost all the digital I/O on the Mega (15 solenoids, 27 contacts.) There are still some adjustments to be done, and I am awaiting a set of Bristol Wrenches (Keys) so I can safely do these. I have tried using Torx and Allen keys, and while they can be made to 'fit', it doesn't seem like a good idea. There are some pictures and videos of the typewriter here: http://www.flickr.com/photos/ljw/sets/72157632841492802/ You can get the Arduino interface code here: https://github.com/ibm2030/IOSelectric I haven't yet documented the hardware I used for the solenoid drivers, but if anyone is interested I can put some notes together (basically: Arduino output to 2N7000 FET buffer to ITS4140N +48V high-side driver on the output side, and a simple 250R pullup to +5V on the input side.) Manuals here: http://bitsavers.informatik.uni-stuttgart.de/pdf/ibm/typewriter/selectric/ (or other Bitsavers mirrors) Info on the Mega2560 here: http://arduino.cc/en/Main/arduinoBoardMega2560 -- Lawrence Wilkinsonlawrence at ljw.me.uk The IBM 360/30 pagehttp://www.ljw.me.uk/ibm360

12 years, 1 month

Source for replacement parts?

by earl＠baugh.org

I'm looking for a part for a Mac Studio display (and yes, I know this doesn't qualify as "classic" but I'm trying to find a good overall solution for this type of repair). The part that failed is a simple piece of metal in a hinge which seems fairly well designed for replacement. However, I've been unable to find any sources for the particular part, Apple, etc. don't seem to have anything available. I do see some sites that have the entire hinge assembly available in the $18-$20 range, but I've been able to pick up entire monitors of this type for $25, so this really doesn't seem to make sense to pay this much for just the hinge when I could get a full set of spares (or even yet ANOTHER working monitor with the same issue). I'm wondering how people solve "spare/parts" issues like this. I've posted something to http://www.shapeways.com/ to see if someone would model the existing part, which I could then get them to fabricate. Not sure if that's going to be cost effective either (unless I order some quantity and sell extras with a mark up...) Earl p.s. A big thanks for the advise on the lubrication for the floppy drives. I ordered some of the Drislide which works excellently. A simple cleaning job with straight isopropyl alcohol, a couple drops, and all three floppy drives are now working as good as new...

12 years, 1 month

Old computer equipment information and value

by davestokie＠gmail.com

Hi, I have been advised to post here for some information about some old computer equipment I have. What I seek is advise on the value or how to find the value and sell the following items: 2x 3M data cartrage desktop storage file 3X (1 opened, 2 sealed) 3M data cartrages DC6151 1X Diaspron Total Shield, 12" 1x Selmar Multi-way distribution block (extension lead with a standard plug and 6 'kettle' sockets) 2X leads with 'kettle' plug and socket 2x leads with 'kettle' plug and 2 in plug 30x leads with kettle plug - nothing on other end I realise the leads have very little value, but I am unsure about the rest. Thanks for your time Dave.

12 years, 1 month

SGI Season, obviously...

by Arno_1983＠gmx.de

Well, it must be the season driving all those nice colourful critters out of their holes... I also was called to an SGI rescue this weekend and came home with an Octane2 (with PCI cardcage housing a 100baseFX adaptor), an R4600 Indy and a teal Indigo2. I wasn't sure whether to accept that last one as I already have two of those - but only until I realized it was that system that contained the host card for the Galileo desktop video connection box that was part of the haul! Furthermore I picked up three different monitors (two in the old granite finish/"3D Cube" logo style, one of these is the variant with the remote control, and one in anthrazite black with the new "sgi" wordmark logo), a few mice and keyboards (including a pre-PS/2 one that will only need an adaptor cable to work with my Personal Iris), and an O2cam for one of my "bare metal" O2s (- their skins were smashed beyond any remedy when they hit the dumpster). So long, Arno

12 years, 1 month

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test-drb May 2013