test-drb September 2010

test-drb@ccmp.vtda.org

163 participants
222 discussions

by jonas＠otter.se

On Fri, 10 Sep 2010 20:02:09 +0100 (BST), ard at p850ug1.demon.co.uk (Tony Duell) wrote: > >Oh, I have one, but it's only a little 1cm radius one, designed mainly >for detecting the helium peak when looking for leaks. What I don't have is >a suitable vacuum pump (yet...) > You might be interested in this site (sorry it's a Web site with pictures and so on, some of it will probably be readable using Lynx, and it's in French to boot, I'm sure it would interest you however): http://paillard.claude.free.fr/ He makes his own triode valves (or tubes, for those of us who speak the other language known as English ;-) ) and in order to do that he has designed and built among other things his own high vacuum pumps. I'm sure you would be able to make one like his. /Jonas

14 years, 3 months

Amstrad PPC640D available Cheltenham UK

by fryers＠gmail.com

All, I have an Amstrad PPC640D with original box that I would like to pass on to someone. These are reasonably common and not that rare. It makes a great low power terminal (LCD screen) and real serial port, but that is about all I can say in it's favor. It will need to be collected in the next two weeks. If I don't hear anything this it will be going off to the small electricals bin at the local recycling centre this weekend. Thanks. Simon -- ------------------------------------------------------------------------ "Well, an engineer is not concerned with the truth; that is left to philosophers and theologians: the prime concern of an engineer is the utility of the final product." Lectures on the Electrical Properties of Materials, L.Solymar, D.Walsh

14 years, 3 months

Cleaning floppy drives

by Hollandia＠ccountry.net

As far as I know, all of the vendors of the "cleaning diskettes" that were available have stopped making them. Does anyone know of a source? Failing that, what is the correct way of cleaning a floppy drive? Thanks, Kurt

14 years, 3 months

FS: Hawley Mark II X063X Rare Vinage Computer Mouse

by nick.allen＠comcast.net

Not sure if anyone is interested, but I am clearing out items I am not using (I have a family of 5 in a 2 bedroom condo, with limited storage space, and a gracious wife with limited patience with my collection). I have listed this Hawley Mark II X063X Rare Vinage Computer Mouse <http://rover.ebay.com/rover/0/e12000.m43.l1123/7?euid=430eac132fc24b63aa8f3…> for sale on ebay: http://rover.ebay.com/rover/0/e12000.m43.l1123/7?euid=430eac132fc24b63aa8f3…

14 years, 3 months

DiscFerret update: PCB done!

by classiccmp＠philpem.me.uk

Hi guys, I've just (within the last few minutes) finished the "first cut" board layout for the DiscFerret. It's a 160x100mm Eurocard, with all the "inputs" (power and USB) on the back panel, and all the disc-drive interfacing stuff (power and I/O) on the front. Truth be told, it's not much different to the prototype schematic I posted to the list earlier this year... The 40-pin disc I/O connector carries a standard 17-line ("34-pin") Shugart disc interface with all lines wired, four high-speed 5V TTL "user I/O" lines, +5V (low current) and ground. The state of the DENSITY pin (pin 2) can be driven as an open-collector output, or used as an input (depending on the type of drive you're using). There's an external "power output" connector for the disc drive. This is a dual-row 4-pin AMP Micro Mate-n-Lok (P/N 3-794618-4, mating connector 794617-4 with 794610-1 contacts) which carries +12V, +5V and two grounds. Current-handling capacity is about 1.5A per channel, so plenty for most PC-style drives. There are no cop-outs here -- you can pull 1.5A from the 12V bus, and 1.5A from the 5V bus *at the same time* without any adverse effects. I wanted to use the standard Molex floppy drive power socket, but Molex only seem to make one PCB-mount variant, which is the "input" socket (which has a recessed body, but contains male pins -- go figure)... There are also three status LEDs -- Power, FPGA Status and PIC Status. The first is always on when the +3.3V regulator is running, the latter two are controlled by their respective devices. A plastic light-pipe redirects the light from these LEDs to the front panel. Simples! For the curious... Schematic: http://www.discferret.com/temp/discferret_sch.pdf PCB layout: Checkplot: http://www.discferret.com/temp/discferret_main_chk.pdf Top copper: http://www.discferret.com/temp/discferret_main_top.pdf Bot copper: http://www.discferret.com/temp/discferret_main_bot.pdf Top overlay: http://www.discferret.com/temp/discferret_main_tov.pdf EAGLE project files: http://www.discferret.com/temp/eagle/ (you'll need all the files in this directory) Next step is to do a full design review (i.e. print the board and schematic out REALLY BIG and go over them with a loupe), create a Quartus constraints file and test-synthesize the FPGA microcode. But first... it's 3AM and I'm tired. Sleep time! zzzzzz.... -- Phil. classiccmp at philpem.me.uk http://www.philpem.me.uk/

14 years, 3 months

How to repair Tektronix 4696 inkjet and what to use for the cleaner fluid cartridge?

by rmay635703a＠yahoo.com

The maintenance fluid is sucked in each time you turn the printer on and expelled at some point.? Basically the print heads sit in a bath of it while not doing anything or while at the carriage return position,? the printer draws the maintenance fluid from the cartridge (which is a plastic bag) and expells it into the same container but on the outside of the plastic bag, one instruction warned not to turn the printer on and off too much and I found out the hard way why as a bunch of colorfull maintenance fluid spilled all over the table. My main interest was figuring out how to dissassemble the machine, at one point there was a maintenance manual for the 4695, sadly the archive that had it didn't seem to want to put it up for download. Cheers Ryan

14 years, 3 months

Help Identifying this Engineering/Mainframe panel

by nick.allen＠comcast.net

Here are some close up photos, thanks everyone for your help =) http://www.facebook.com/album.php?aid=213052&id=530841851&l=714eeedccd

14 years, 3 months

Boeing tearing down plant in Seattle, piles of old computers...

by wh.sudbrink＠verizon.net

Article: http://news.yahoo.com/s/ap/20100914/ap_on_hi_te/us_boeing_plant2_1 Quote: "The huge production bays now store tools, vehicles and surplus office equipment, plus scattered piles of old computers and other castoffs." I wonder if there is anything really interesting in there. Bill Sudbrink

14 years, 3 months

TI-74 BasiCalc question

by bob099＠centurytel.net

I picked up 3 of these that were being thrown out at work. Found a lot of information on the net, but don't see anything creative being done with the DockBus(HexBus) on them. Anyone have a pointer to something interesting?

14 years, 3 months

HP 9845 replacement ROM boards

by hp-fix＠xs4all.nl

The rom's on my HP 9845B are getting unstable when the machine is heating up, they're giving errors. Ansgar Kueckes from <http://www.hp9845.net> www.hp9845.net has a very nice solution, the design for a replacement board using flash memory. It includes the pcb desing, I asked him permission to use his design and produce a certain amount of PCB's and to sell them for cost price to other collectors. He agreed, the more I order the cheaper the price will be, so who wants a PCB for his HP 9845 ? More info on the project at : http://www.hp9845.net/9845/projects/romboard/ If you're interested let me know off-list -Rik

14 years, 3 months

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test-drb September 2010