test-drb May 2004

test-drb@ccmp.vtda.org

244 participants
500 discussions

by jimmydevice＠hotmail.com

Is it possible to attach ( with a proper connector ) an "isolated" midi device directly to the soundblaster midi joystick iinterface? I don't feel like building a full opto isolated pass through interface for this little keyboard. Just midi in to the computer is OK. BTW, this is on topic, the KB is over 10 yo. Thanks, Jim Davis.

20 years, 3 months

VT52s wanted

by aek＠spies.com

> isn't it on Bitsavers? I have it all scanned, i'll get it on line under dec/terminals tonight.

20 years, 3 months

Discharging CRT anode and capacitors on a VT52 DECscope

by wacarder＠usit.net

I recently acquired two VT52 DECScopes and I am ready to begin the troubleshooting process. I've never attempted to troubleshoot a CRT device before, and I don't want to get blasted across the room if I do something wrong. Has anyone here worked on these types of terminals before? I'm finding conflicting info on the proper method of discharging the CRT anode. I have turned both of them on. One lights up with random patterns, no cursor, and a clicking sound. The VT52 maintenance manual indicates that this is likely a problem with the anode clip or anode cap. I'd like to move on to the next step after I make sure that both the clip and cap are secure. Can an "expert" here provide some proper directions on how to discharge the anode and capacitors? How long do these things on a charge? Ashley

20 years, 3 months

2000C A guide to Time-shared BASIC Hewlett Packard 1971

by rigdonj＠cfl.rr.com

<http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=378&item=6901337033& rd=1&ssPageName=WDVW> Joe

20 years, 3 months

VT52s wanted

by wacarder＠usit.net

Does anyone have any dead DEC VT52 terminals they would like to donate to my cause? All clues are now pointing to a bad RUT module on *BOTH* of my VT52s. One RUT module causes the CRT to do random things. The other one, which is much more well behaved, lets me get the flashing cursor that I should get, but no keyboard input is displayed and there are no keyclicks. I suppose I could go through the individual components of the RUT board one by one and replace them to see if I can get anything to happen. Before I do that, I am going to do some more research. Back to studying the detailed technical documentation in the VT52 Maintenance Manual. Ashley

20 years, 3 months

Help identifying AppleII cards?

by aek＠spies.com

> What's an ISAAC? -- A lab A/D D/A and digital I/O box that sat on top of the IIe with similar styling.

20 years, 3 months

Wanted: M9312 ROMs (data i/o help needed)

by dave04a＠dunfield.com

At 16:37 28/05/2004 -0400, you wrote: > > (1) I have a 29A manual but there's no device codes in it. The codes are >in the manual for the particular plugin that you're using so you'll have to >tell us which one you're using. There are some large text files with listing for at least the Unipak2B, LogicPak and the gang banger available on the net somewhere - I know cuz I just recently downloaded em - found with a google search for "Data I/O 29B" I believe. Regards, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Vintage computing equipment collector. http://www.parse.com/~ddunfield/museum/index.html

20 years, 3 months

Help identifying AppleII cards?

by aek＠spies.com

20 years, 3 months

"Revived" IIci

by cb＠mythtech.net

>I have a Mac to VGA adapter connected... Specifically the Belkin model which >adapts Mac video to VGA and ADB to PS/2 mouse and keyboard. I just didn't >have a VGA monitor connected to that when the Mac "decided" to power on. >Will I still get no video? You should be ok then. Most Mac to VGA adaptors will fool the Mac into thinking a monitor is connected. -chris <http://www.mythtech.net>

20 years, 3 months

Lear Siegler ADM-3A CRT problem

by elf＠ucsd.edu

Hi folks, I've had a Lear Siegler ADM 3A terminal in storage (a closet) for a number of years, and recently went to pull it out. Much to my disappointment, the CRT now has some problems (_physical_ problems, not electronic). When I originally stored it (about 4 years ago), all was well. But now there are bunch of "spots" peppering the outer perimeter of the front of the CRT. These spots are NOT on the surface of the CRT (i.e., it is not a "bubbling" sort of phenomenon), but rather behind the outer glass. Here are some pictures: (approx. 35K each) http://home.san.rr.com/instep/adm3a-crt.jpg http://home.san.rr.com/instep/adm3a-crt1.jpg When I power the terminal up and type some characters, they are all perfectly readable when located away from these spots (i.e., towards the center of the screen). But if the characters are positioned behind these spots, it is as blurry as hell. 1) What's happened to my CRT? Is this symptomatic of a slow air leak? Or is this mold? (it sure looks like it! :-) 2) Can the CRT be fixed/repaired? (my guess is no) 3) If it (the CRT) can't be fixed, does anyone know a source for a new (or used) one? (It is a "Ball Brothers Inc." CRT) Kind regards, Eric

20 years, 3 months

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test-drb May 2004