test-drb October 2002

test-drb@ccmp.vtda.org

261 participants
654 discussions

by gil＠vauxelectronics.com

Hi Jos: I forwarded your message to some folks that may know more about your problem, and I'll let you know when I hear back. The 33 does not have the longevity of other machines like the 35, 28, 15... It was designed as a "light-duty" machine, and has "bend-this-part" kind of adjustments in places instead of eccentic screws, etc. When they hit enough hours, they seem to crap out. But yours may just need some TLC. One word of warning for any mechanical device, especially a teletype -- never use WD-40. It is shellac-based and will turn to gunk in a couple of years. (just like it does on everyones door hinges). I use 3-in-one oil for light linkages, 20W or 30W motor oil for heavier needs, and lithium grease for cams, etc. gil At 01:01 PM 10/19/02 +0100, you wrote: > > >After a whole day of finetuning my ASR linefeed pawl stops, I still cannot >get it to produce a reliable linefeed. Most of the time I get nothing ,or a >half line, sometimes it feeds at each character. > >Is there any secret to this mechanism ? The ASR manual is not a great help, >as it does not mention anything besides the pawls'and their stops. > > Jos Dreesen > > ;----------------------------------------------------------- ; vaux electronics, inc. 480-354-5556 ; http://www.vauxelectronics.com (fax: 480-354-5558) ;-----------------------------------------------------------

21 years, 8 months

ASR33 linefeed solved! So here is the next ASR problem.......

by dwightk.elvey＠amd.com

>From: "jos.mar" <jos.mar(a)bluewin.ch> > > > >The problem with my ASR33's linefeed has been traced to a disintegrated piece >of plastic on the upstop bracket of the linefeed linkage. (item no. 18708) >Without this plastic piece the upstop vertical adjustment range is too small >for a reliable linefeed. A few windings of plastic tape did the trick. >My ASR now prints out a sourcecode papertape quite nicely. > >Thanks for all the tips. As to WD40 : I never use the stuff... > >The next, and hopefull last problem of my ASR : the keyboard. >It sometimes misses a bit ( B becomes A etc. ) This is more than likely >curable by adjusting or replacing the contact wires. >However the keyboard also quite often gives out 2 characters for each key >pressed. I am at a loss as to what could cause this behavior. Tips anyone ? Hi It is more likely that you just nees to clean the contact surfaces, rather than replacing the wires. They are plated and should last a lifetime. The double printing is most likely that the keyboard isn't getting reset after a key is hit. There is a bell crank that connects the printer to the keyboard that is to reset the keyboard and lock out a double key. It is most likely that the travel on this isn't enough. Check the manual, there is an adjustment someplace. Here is a trick that I used when I was in the service. Things happen so fast in a teletype ( I worked on the older Klienshmit type with the moving box ) that it is often hard to tell just what is causing problems. I has a switch on with some wire that I could use to shut the motor off, without turning off the rest of the power. The motor power is on a screw strip, someplace. I could then turn on the main power with the motor on and lock up all of the clutches. I could then turn the motor off and run things from the keyboard manually by turning the fan on the motor. One can't see everything this way because may things have an interial effect but it was a lot of help. Make sure that if a clutch is tripped that you get it fully locked again. When the motor is spinning fast this isn't a problem but manually, they won't lockup and will drag. It is hard to describe this in text but you squeeze the latch part that catches on the clutches. Some time the clutches don't latch up on a powerup. I always hit a key on each power up to make sure they are not dragging. If they are dragging, you'll burn up a clutch in just a few minutes. Manually, you should be able to stop things, while the keyboard wires are making contact. You can then check each one for voltage drop as the distributer selects each to the printer. You can find an open, quickly, this way. Dwight > >My ASR33 came with a reasonable number of original replacement parts. Should > anybody be in dire need of a part to get her/his ASR running again... > > > > > Jos Dreesen. > >

21 years, 8 months

ASR33 linefeed solved! So here is the next ASR problem.......

by jos.mar＠bluewin.ch

The problem with my ASR33's linefeed has been traced to a disintegrated piece of plastic on the upstop bracket of the linefeed linkage. (item no. 18708) Without this plastic piece the upstop vertical adjustment range is too small for a reliable linefeed. A few windings of plastic tape did the trick. My ASR now prints out a sourcecode papertape quite nicely. Thanks for all the tips. As to WD40 : I never use the stuff... The next, and hopefull last problem of my ASR : the keyboard. It sometimes misses a bit ( B becomes A etc. ) This is more than likely curable by adjusting or replacing the contact wires. However the keyboard also quite often gives out 2 characters for each key pressed. I am at a loss as to what could cause this behavior. Tips anyone ? My ASR33 came with a reasonable number of original replacement parts. Should anybody be in dire need of a part to get her/his ASR running again... Jos Dreesen.

21 years, 8 months

Toshiba 3100/20's with schematics and service manual

by curt＠curtgowan.com

I have two Toshiba 3100/20 plasma display 286 systems. Both working except that one has a dead hard drive. Excellent condition. Have the schematics and service manual, user docs, software. Anybody want them? --cg

21 years, 8 months

HP 2647A / F Terminal

by glenslick＠hotmail.com

I just received an HP 2647F terminal along with two 13272A 5.25" drives and cables plus a 02640-60043 modem cable and a 02640-60266 HPIB cable, but no manuals. Physically it all looks pretty good, no broken or missing keys and no screen burn or mold, and I figured out how to format floppies and create some files on them and the floppies seem to work ok. I figured out how to open the unit and looked at the boards inside and was slightly disappointed to find that the CPU is an 8085 instead of more cool 8080. This unit has a 1982 date. A couple of questions: I found some references on the web that the 2647A/F supports BASIC. Is that true? Is it in ROM, or does it need to be loaded from tape or disc? If it is in ROM I haven't been able to figure out how to get at it. Is the HPIB cable used just for connecting to printers, or can it be connected to other things? What's the difference between a 2647A and a 2647F? -Glen _________________________________________________________________ Broadband? Dial-up? Get reliable MSN Internet Access. http://resourcecenter.msn.com/access/plans/default.asp

21 years, 8 months

Free : Manual for Barco CV33-2 SE

by stefan＠softhome.net

I have here a manual for a CV33-2 SE/HE made by Barco Industries. Free for anyone who wants it and is willing to pick it up or pay for postage. Manual is dated 19 nov 1984. The CV33-2 is a videotex terminal btw. yours, Stefan.

21 years, 8 months

A Momentous Decision

by Robert_Feldman＠jdedwards.com

The only computer of mine that I named was/is my Otrona Attache 8:16, which I named "El Otorongo," (Quechua/Inkan for "The Jaguar"). Besides being alliterative, the name was appropriate, as this computer spent several years in Peru with archaeological projects I was involved with. Bob -----Original Message----- From: ard(a)p850ug1.demon.co.uk [mailto:ard@p850ug1.demon.co.uk] Sent: Friday, October 18, 2002 5:42 PM To: cctalk(a)classiccmp.org Subject: Re: A Momentous Decision > > After much pondering and debate, I have finally decided on a name for > my Cromemco System Two. Once she is operational, she shall be > christened as Mintaka. Just out of curiousity, how many other people here name their classic computers (for reasons other than giving them a network address) -tony

21 years, 8 months

[OT] paper on Retro ?

by pete＠dunnington.u-net.com

On Oct 19, 8:33, Stan Barr wrote: > ard(a)p850ug1.demon.co.uk (Tony Duell) said: > > > > Also, many of us remember filling in a coding form, then either punching > > a card deck or having one punched, then handing it to the operator, then > > coming back to collect the output (normally error messages :-)). I wonder > > if people will even rememebr that went on in, say, 50 years time. > > I used to have to fill out coding forms, put them in the internal mail > with a run request and get a printout in the mail a day or so later. > It made debugging somewhat slow :-) At school (secondary school, I suppose that's high school for Americans), we used to fill out FORTRAN (even though we were writing ALGOL) coding forms and hand them in, and get them back a week later. It taught the value of dry-running a program :-) When I worked at Edinburgh University in the mid-70's, our research unit had punch operators who'd punch the cards, and I'd take the boxes up the road about 3/4 mile and hand them in. Then they'd sit in a queue until the operator fed them in, and we'd get the printout back later that day (usually). I must have handled hundreds of thousands of punch cards, but now I all I have are three empty metal trays and one card (and I only have the card because someone sent it to me with a note on it a while ago). Can anyone remember how many IBM cards fit in a box? A card is nominally 8 thou thick, and a tray is about 16.5" long internally, so it must be something of the order of 2000. Who remembers drawing a cross or a diagonal line on the top of the card deck, so you had some chance of re-ordering the deck if someone dropped the box? Who remembers using a folded card (16 thou) to check the points on their engine (nominally 15 thou)? Folded in three to check the spark plug gap (nominally 25 thou)?? -- Pete Peter Turnbull Network Manager University of York

21 years, 8 months

A Momentous Decision

by healyzh＠aracnet.com

> Just out of curiousity, how many other people here name their classic > computers (for reasons other than giving them a network address) > > -tony Personally the only computers I give names to are ones on my network (of course basically every system I have setup is networked). I've reached the point though where the name is likely to simply reflect what kind of hardware the host is. Other times the name might be what it was prior to my getting it. Zane

21 years, 9 months

VT52 repair [was: Favorite terminal]

by djg＠drs-esg.com

> Does anyone have the schematics for the VT52 ? > Yes, I send them to Eric Smith to be scanned along with VT78 and random other stuff. I can't easly do B size with my scanner. If all went well I should be getting the scans within a week to put online. I suspect they will show up on www.spies.com also. David Gesswein http://www.pdp8.net/ -- Run an old computer with blinkenlights.

21 years, 9 months

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test-drb October 2002