test-drb

test-drb@ccmp.vtda.org

101090 discussions

by cctalk＠ibmjunkman.com

I also have a few others listed: ADINTS https://www.ebay.com/itm/132588526929 IBM 1401/707 https://www.ebay.com/itm/132581434367 IBM System/3 https://www.ebay.com/itm/132593475814 Yet to be listed is a 650 and 2 suitcases of System/360 Model 70 models used in the 1964 Worlds Fair.

8 years, 3 months

Restoring rubber keyboard on a logic analyzer

by shadoooo＠gmail.com

Hello, this kind of keyboards was made using small pieces of conductive rubber to close the circuit designed on the PCB. The rubber was an uniform compound, so even with severe usage, i.e. high consumption, the conductivity remained constant. However, in more recent / cheaper products, the rubber is the same for the whole keyboard, i.e. simple insulating silicone rubber. The conductive surface is only painted over the silicone. No doubt it comes away faster... In this case, cleaning with alcohol just removes the remaining paint, referring the keyboard useless. The solution is simple: cover the key contacts with something conductive. I know that conductive paint is sold somewhere, but it's pricey and don't think it would last much... The cheapo solution is to cut small pieces of aluminum foil, and glue it to the rubber. Given that the keyboard is almost always made by silicone, I always use silicone glue to assure the sickness. Be careful to put a very thin layer of it only over the center of the foil, then put it in place and press a bit around with the fingertip to let it take the shape of the contract. Too much silicone would come out when pressed and would cover the graphite on the PCB. This method worked well with several TV remote controls. I could suggest you to try with one key, then let the silicone to dry before remounting the keyboard, then check the result and eventually repeat on other keys. Andrea

8 years, 3 months

Visiting Boston - Classic computer recommendations

by huw.davies＠kerberos.davies.net.au

I?m in Boston MA (technically Canton) for the next three weeks (April 29 to May 19). Looking for recommendations on classic computer/classic car/sailing things of interest to do on the weekends. Huw Davies | e-mail: Huw.Davies at kerberos.davies.net.au Melbourne | "If soccer was meant to be played in the Australia | air, the sky would be painted green"

8 years, 3 months

Anyone fancy lending out a Replica I for a few weeks?

by brain＠jbrain.com

I would like to ensure my PS2Encoder project works on the Apple I, but I have no unit to test with. Alternatively, anyone out there with access to an Apple I/Replica I/functional equivalent who can test and reprogram an Atmel ATMEGA88 or ATMEGA168? Jim -- Jim Brain brain at jbrain.com www.jbrain.com

8 years, 3 months

Blog in portuguese - are updates allowed/wanted?

by alexandre.tabajara＠gmail.com

Dear friends I have a blog in portuguese where I write my adventures in repairing and maintaining old computers. Today's post is: http://tabajara-labs.blogspot.com/2018/04/msx-yamaha-yis303yis503-e-seus-ir… Should I post updates to my blog here? Are these wanted/allowed? I believe yes to both Thanks Alexandre (and don't forget to click on the ads and share around :) ) (and check often the blog, there are tons of great info :D) (and google translate is your friend!) (and the groove is in the heart :D )

8 years, 3 months

Intel HEX formats

by dave＠661.org

I'm trying to understand various hex formats so I can add them as output options to minipro[1]. I went looking for existing code to convert binary to Intel hex and found repeated copies and references to "format83.c" by Erik Lindberg. It seems to do what I want, but I'm unclear what "Intel HEX 83 format" is supposed to mean. Based on what I see at http://www.math.purdue.edu/~wilker/misc/DEVEL/0036/A-6804/BIN2INT.C, this program only creates hex files in the I8HEX format, as described in https://en.wikipedia.org/wiki/Intel_HEX. Of course, I'm going to have to support the I16HEX and I32HEX formats too. Based on what I find in format83.c, this shouldn't be too much trouble, but I really want to know what "Intel HEX 83" is supposed to mean. [1] https://github.com/vdudouyt/minipro/ -- David Griffith dave at 661.org A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

8 years, 3 months

anyone in winnipeg looking for a 11

by tdk.knight＠gmail.com

i know of pdp 11 thats going to get lost to a building demolition in winnipeg if i was in the city i would jump up and down to grab it it my self ive got most of the paper tapes for it and the drawings i managed to rescue a while back.. theres a office on the otherside of the floor just about other side of the wall from the 11 that has more manuals and documents possibly 8" floppy disk software in said room (more like a closet 8x8 room there some vandle damage to the front of the 11 was painted with some spray paint and the spectrimanalizer its atached to was smashed also theres also a room with the big built in desk for a control room dating back to the 60's 70's been striped of some stuff if anyonres looking for that sorta stuff

8 years, 4 months

Picked up stuff from Pete's

by aperry＠snowmoose.com

For those follow the rescue of equipment from Pete Lancashire's place outside of Portland ... I went out there last Friday. Pete was unavailable, so a friend of his let me and showed me where to avoid stepping. The amount of stuff there was impressive/amazing/overwhelming. Aside >from the test equipment and old telecom equipment that was pointed out when I was shown around, it was hard to focus on one thing because I would immediately see something else interesting that grabbed my attention. I picked up seven Sun SPARC systems and three Compaq-branded Alpha systems. The Alpha systems all went to a local (Seattle) person who is talking to Bill Gunshannon about possibly getting one out to him. One of the Alphas was a DS20 deskside and I never figured out what the other two were. They were narrower and longer than the DS20. There were also some loose 72G Ultra3 SCSI HDDs. The Suns were a SS1, SS2, two SS5s (one with a Netra top cover), two SS20s (one with its cover removed and MBus card and memory lying near it) and a SS1+ "prototype". I am keeping the SS1+ and a SS5. I have found a home for a couple more of them and will be looking for a home for the rest. The SS20s are the most problematic. As you would expect from a system with its top cover missing, one of the SS20s does not display any diagnostic output or get to the OBP prompt after being powered on. The "good" one displays a "replace motherboard" message while going through its diagnostics. Also, as you might expect, the one called a prototype was the most interesting to me. I am a long-time Sun employee and, while I wasn't around when the SS1+ was developed, I know people who were. It isn't like any prototype that they knew of. Still trying to figure out exactly what it is. The top cover is metal and slides over the chassis (not plastic and pivots into place like a SS1+. There are no external markings on it. It has a Sun SS1+ motherboard, Sun0424 HDDs, and uses SS1/SS1+/SS2 HDD carriers, but has a Sony (not Sun) labeled power supply. As far as the 029 keypunch, it is still there. There was some confusion and the people who were supposed to come get it didn't. I have described to them where it is and how I would go about removing it. alan

8 years, 4 months

More retro than you might think: the LCD

by lproven＠gmail.com

Science The tech you're reading these words on ? you have two Dundee uni boffins to thank for that Spear and LeComber stumbled on the thin-film-transistor liquid-crystal display 40 years ago By Alistair Dabbs 25 Apr 2018 at 09:15 https://www.theregister.co.uk/2018/04/25/dundee_hidden_home_of_tft/ -- Liam Proven ? Profile: https://about.me/liamproven Email: lproven at cix.co.uk ? Google Mail/Hangouts/Plus: lproven at gmail.com Twitter/Facebook/Flickr: lproven ? Skype/LinkedIn: liamproven UK: +44 7939-087884 ? ?R (+ WhatsApp/Telegram/Signal): +420 702 829 053

8 years, 4 months

GDB front-end for SimH

by kylevowen＠gmail.com

Has anyone made a GDB front-end for SimH? Just curious. Seems like it could be an interesting way to tie an IDE to SimH, if one were inclined. Thanks, Kyle

8 years, 4 months

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