test-drb June 2008

test-drb@ccmp.vtda.org

194 participants
304 discussions

Looking for a Zenith Z29 terminal, and some VT100 keyboards

by ian_primus＠yahoo.com

Well, I just acquired some VT100's, albiet without keyboards. So, now I'm looking for some VT100 keyboards - even broken or damaged ones. Also, I _just_ missed a Zenith Z29 terminal (newer than the Z19, with detachable keyboard), on eBay, simply because I forgot to bid before I left the house. Augh! So, I'm looking for one of those too - does anyone have one that is looking for a home? Also, while I'm looking for stuff, anyone have a Qbus Pertec tape drive controller that'll work in a Vax? Thanks guys! -Ian

15 years, 4 months

Bernoulli/Syquest carts available

by SUPRDAVE＠aol.com

I've more of these than anyone will need and they're all brand new. 3 packs of Bernoulli 5.25 44meg disks KAO 5.25 88meg syquest disks. The label inside says they are formatted for Macs but includes software for wintel machines also. $1 each plus whatever for shipping and they're yours. Just say how many you want. -- I am not willing to give up my privacy for the false promise of 'security'

15 years, 4 months

Commodore 64 Power Supply

by sethm＠loomcom.com

I'm sure most everyone who has ever used a C64 is aware of just how phenomenally bad the Commodore power supply is. I have only one C64, but both of my spare Commodore power supplies have now failed, taking a few 4164 RAM chips with them (thankfully, I have replacements!). Does anyone know of a commercially available replacement power supply, before I go off and build one? A linear supply would be trivial to design, but I've never done a switching power supply, which I suppose would be greatly preferable. The trick with the C64 is that it requires both 9V AC and +5V DC. (I've considered frankensteining together 9V AC and +5V DC wall-wart adapters onto the same DIN-7 cable, but it just feels so very very wrong). I'd love to hear from other Commie fans who've solved the power problem. -Seth

15 years, 4 months

Connecting IBM GXT550P to SGI monitor.

by trasz＠FreeBSD.org

Is there any way to connect 13W3 output of GXP550P (graphics card in RS/6000 p43) to 13W3 SGI monitor (GDM-20E21)? In order to connect SPARCstation I had to make a little modification of the SS2 to make it generate sync-on-green signal. Will the same modification work with IBM? -- If you cut off my head, what would I say? Me and my head, or me and my body?

15 years, 4 months

Vintage Computer Festival/Midwest 4 - Just one week away

by pat＠computer-refuge.org

Just a reminder that next weekend is my 4th annual Vintage Computer Festival/Midwest, held at Purdue University's Stewart Center. The event has speakers from 11am until 1pm each day, and the exhibits are open from 1pm until 5pm. The ticket price is $5 per day, or free if you're 17 or under, or have a valid Purdue student ID. The event is a celebration of the history of computing, and the machine and people that got us to where we are today. There will be lots of neat technology, and this year we have a door prize of an IBM PCjr from 1983! The PCjr was IBM's first attempt at an inexpensive home computer. I've got several exhibitors signed up, but still have room for more; if you want to show up to show off your collection, or have a few things to sell off at the consignment sale, sign up to be an exhibitor at http://vintage.org/2008/midwest/, or send me an email at this address. Exhibitors get one free t-shirt and free admission, which is included in the $10 per table fee. Pat -- Purdue University Research Computing --- http://www.rcac.purdue.edu/ The Computer Refuge --- http://computer-refuge.org

15 years, 4 months

RFC re Willem EEPROM programmers

by doc＠mdrconsult.com

I'm looking at buying a Willem programmer to go with my Data I/O 29B. Mostly I'll be using it for reading existing ROMs and programming stuff bigger than the 29B can handle. I've been looking at willem.org, on eBay, and at a couple of non-eBay sources. The first most obvious problem is that none of the available variants exactly match the willem.org board revisions, and I haven't found any cross-reference information. I'm probably not going for the new "true-USB" board. Any system I'll run it with has parallel ports. So... 1) I know a few folks on the list have willem boards. What board version do you have, where did you get it (if you remember), and are there any major pros and cons? 2) Does anybody here have experience with Kee Electronics? http://www.keeelectronics.com/ I'd rather buy direct than off eBay, and they look like a good product line. 3) Yes, I know the software's Windows-only. If anybody knows of a sub-$100 programmer with OS X software, I'd be overjoyed to hear about it. Otherwise, BFD; I have to keep a Windows box for work anyhow. Any input is greatly appreciated. Zane, I'm still getting a 554 reject from citrine.aracnet.com Doc

15 years, 5 months

HP Keyboards

by dr.emiel＠xs4all.nl

Does any one knows if the keyboards of the 9000/200 series are interchangeble with the HP-150 keyboards ? Rik

15 years, 5 months

HP 1826-1388 Network interface chip

by ard＠p850ug1.demon.co.uk

I'm currently looking at the HP50962 SRM Coax interface PCB. This is a (custom) netowork card for HP9000/200 copmputers. I can't indentify one the the ICs, which basically links to the Coax netowrk cable. It's made by AMD (big AMD logo on it), and carries the HP house number 1826-1388, which I can't find anywhere. It's a 24 pin ceramic DIL package, and I've identified some of the pins : 1 - to ground trhough a resistor (maybe soemthing like Rx gain set) 3 - ground 4,5 - to a pulse transformer, the other side of which goes to the coax connector. Rx inout? 6,7 - ground 8 - Clock input 11 - Rx Clock output 13 - Rx Data output 15 - Tx Clock (output??) 17 - Tx Enable/ 18 - Tx Data 19,20,21 - +5V 22,23 - To 4,5 via low-value resistors (and thus to the pulse transformer). Tx Out? Looking down lists of ICs, I wonder if it's related to the AM7960 or AM7961, but I can't find data on those anywhere. So : 1) Does anyone have the data sheets on those ICs on-line anywhere? (As ever, please don't send pdfs or other large files to me here, but if you have said data sheet as a pdf, I can tell you how to get it to me). 2) Any other ideas as to what that chip might be. Thanks in advance -tony

15 years, 5 months

Replacement "pick" roller for card reader

by phil＠ultimate.com

I picked up an HP7260A table top card reader, with the aim of restoring it to working condition. The major problem has been that the "pick" roller that moves the card out of the input hopper and through the first gate had melted into a pile of goo, ending up in a puddle in the output hopper. I only had to sacrifice four blank cards (hand fed) before getting one to pass thru the rest of the transport almost entirely unblemished(*). So far the control/sequencing circuitry seems to be working, but I haven't checked yet if any data is comming out the serial port. Thanks to the HP Computer Museum (www.hpmuseum.org), I found the maintenace manual, and an image of what the roller looked like (#48 in the image below): http://www.ultimate.com/phil/roller.jpg I used one of these readers when I was in High School c. 1978. Before finding the maintenance manual I had no memory of what the roller looked like, but it must have been something soft, with a lot of gripping power. Any suggestions (short of attempting to cast a replacemnt out of melted gumi candy)? The axle is a quarter inch or close, and roller needs to be at least a quarter inch thick. I'm tempted to drop in on a local rubber products company (Greene Rubber, in Woburn Ma), but knowing what to ask for would help! Thanks in advance for any suggestions. Phil (*) One pinch roller inside was slightly gooey, and still gives off blackness, no matter how many times I clean it. The pinch rollers all have a flat spot from having sat for many years, and I might try to replace them with O-rings, but it's not the top priority.

15 years, 5 months

1000sqft of raised flooring for $500

by aek＠bitsavers.org

Just spotted this on eBay http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=220250708938

15 years, 5 months

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test-drb June 2008