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Type: Posts; User: Chuck(G)

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  1. "Then I've just been plopping vias down right on...

    "Then I've just been plopping vias down right on the solder pads"

    I'm not following. To me, a via is an interlayer device connecting two layers of a PCB. Do you mean something else?
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    Does the floppy drive seek to track 0 upon boot?

    Does the floppy drive seek to track 0 upon boot?
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    FWIW, you can also use CopyQM in "blind" mode.

    FWIW, you can also use CopyQM in "blind" mode.
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    Do you need a step-by-step on how to take a Tandy...

    Do you need a step-by-step on how to take a Tandy 2000 5.25" floppy to a 3.5" DSDD? I've got a 2K sample in my collection, so I'm willing run through the process. You need a PC capable of running...
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    You both have your PS5s now?

    You both have your PS5s now?
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    Howso? IMD can do it with very little finagling.

    Howso? IMD can do it with very little finagling.
  7. Have you checked McMaster-Carr? ISTR that they...

    Have you checked McMaster-Carr? ISTR that they had a bunch of sheet PU available.
  8. Well, it's not as if sheet PU is very expensive. ...

    Well, it's not as if sheet PU is very expensive. According to the guy at Imation, that's how it was done to get a seamless band. I suppose one could purchase an extruded PU tube and lop segments...
  9. Curtis (including this model, the PCM) made...

    Curtis (including this model, the PCM) made sold-state drive emulators and was well-known for that up until about 2000. Note the ad here.

    I suspect that what you've got is only half of a...
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    Again, it's all the same chip--just different...

    Again, it's all the same chip--just different foundries. The only thing to be really aware of is the non-A parts--they have a much longer start-of-track PLL sync time, which was subsequently found...
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    "...in the tandy parts list is a 675a" No,...

    "...in the tandy parts list is a 675a"

    No, it's a NEC D765A, also known as the µPD765A, cross-licensed with Intel as the i8272A; licensed to other manufacturers as well (e.g. Zilog Z0765A).

    40...
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    I can recall seeing more Univac 1701 keypunch...

    I can recall seeing more Univac 1701 keypunch keyboards on the surplus market than the keypunches themselves. Nice unit--more advanced than the 029s.
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    The motor, IIRC, should spin as you're closing...

    The motor, IIRC, should spin as you're closing the latch. I've got a 580 here and I'll check it out in the next couple of days to make sure I'm not talking through my blowhole.

    As far as...
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    Scrapped mostly. But they're still around. ...

    Scrapped mostly. But they're still around. MEI, I recall, bought up off-lease 026s and refurbed them.

    The problem is that most all unit-record gear as well as IBM mainframes were leased. IBM...
  15. I suspect that more electrolytic capacitors fail...

    I suspect that more electrolytic capacitors fail as a natural consequence of operation than by storage conditions. The usual rated life of a wet aluminum electrolytic cap in continuous operation is...
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    Wouldn't the reliability depend mostly on whose...

    Wouldn't the reliability depend mostly on whose and what kind of chips the vendors use? Is there a real difference between vendors using the same Hynix, Micron or Samsung chips? (There aren't very...
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    Up until recent years, AMD had their own foundry....

    Up until recent years, AMD had their own foundry. Now they have to rely on outside resources, which I think, puts a crimp into their production plans. Never understood that move.
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    I recently purchased a third-party toner+drum...

    I recently purchased a third-party toner+drum unit for my Brother that costs less than the same toner-only cartridge at the local Staples.

    On the other hand, I have a Xerox Docuprint laser that...
  19. You should be careful in any case. I had a...

    You should be careful in any case. I had a Tandberg SLR drive and flashed the wrong firmware, essentially bricking the unit. Worse, the EEPROM PLCC was soldered in. I eventually rescued the...
  20. A lot depends on the boards and connectors used. ...

    A lot depends on the boards and connectors used. I grabbed an old system off the shelf that hasn't had its cards out in over 30 years. Powered right up--even the hard drive (a Rodime 203--not...
  21. ...and if it's old card, it may well be subject...

    ...and if it's old card, it may well be subject to wear already. Once you're through the copper base layer, it's usually curtains for the card. So I avoid any abrasives at all.

    Consider the...
  22. That last one would be my method of...

    That last one would be my method of choice--either that or some plain old contact cleaner. I don't like erasers, particularly the pink ones used on pencils, because they're abrasive. A gum...
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    The Model 20 was supposed to be the replacement...

    The Model 20 was supposed to be the replacement for the ubiquitous 1401. The 1401 was very popular in 709x shops as a SPOOL driver. I wonder how many 1440s still exist.
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    Sure, but for nearly 70 year old technology, it...

    Sure, but for nearly 70 year old technology, it was remarkable. Somewhere, there's a recording of the thing being used--it's not exactly high-fidelity. There was another system that used a...
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    Might be worth a shot to see if the drive is...

    Might be worth a shot to see if the drive is started and a disk inserted results in correct centering.
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