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Type: Posts; User: Chuck(G)

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  1. Replies
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    Check the pins on the 7416 that I cited above. ...

    Check the pins on the 7416 that I cited above. It's not usual for those to go bad under load. In a pinch, you can get away with a 7406--actually a better chip for this application.
  2. Look at the second shell half in my photo, See...

    Look at the second shell half in my photo, See the recess cut for the leaf spring? That's the kind of hood that I'm looking for. The OEM was probably Cannon (P/N MD-15-00L-VL) Seems to have been...
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    Does the drive seek to track 0 on the T1000?

    Does the drive seek to track 0 on the T1000?
  4. DA15 slide-lock hood with 90 degree entry.

    The title pretty much says it all. Somewhat akin to this one, but 15 pin Dsub and the entry is on the side. Can't seem to find any online.
    ...
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    Don't let the small caps faze you--I've...

    Don't let the small caps faze you--I've hand-soldered 0603s with no problem. Just takes a little practice is all. With a hot-air tool, it would be even easier.
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    Does the 2K use the PC drive-select convention?...

    Does the 2K use the PC drive-select convention? That is, are both jumpered to the second drive select and the cable uses a twist to differentiate them? Or does the 2K use first drive=DS1, second...
  7. Welcome to the world of babel-terminals. ...

    Welcome to the world of babel-terminals. Televideo did produce a VT220-type terminal, but that was the 922.

    Here's the terminfo for the 920C
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    Hmmm, that's not right. The 765 should be...

    Hmmm, that's not right. The 765 should be issuing a "recalibrate" as part of its reset sequence, as the software needs to know the actual position of the drive head--and the only reliable way to do...
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    Ah, I think I understand now--you're placing a...

    Ah, I think I understand now--you're placing a via in a component soldering pad. I wouldn't do it--vias are formed by a electroless plating process and are, therefore, less robust than regular...
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    "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.
  16. Have you checked McMaster-Carr? ISTR that they...

    Have you checked McMaster-Carr? ISTR that they had a bunch of sheet PU available.
  17. 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...
  18. 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...
  24. 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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