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Type: Posts; User: MikeS

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  1. Replies
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    Yeah, excellent 'Linear Supplies 101' from...

    Yeah, excellent 'Linear Supplies 101' from Dwight.

    Maybe just my own experience but unlike modern small caps I've never seen goo coming out of one of those huge old large-value caps but I have...
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    Took you guys long enough ;-) Just kidding;...

    Took you guys long enough ;-)

    Just kidding; congratulations for another successful rescue!
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    I think for a while during the RAM shortage days...

    I think for a while during the RAM shortage days manufacturers even including IBM were re-testing defective 16K chips and sorting and using them as 'upper 8 OK' or 'lower 8 OK'.

    See:...
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    That'd be one of the four versions of the 2001...

    That'd be one of the four versions of the 2001 (no 'N' suffix); the 2001Nx, 30xx and the 9" screen version of the 40xx all use the 'Dynamic' PET board:...
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    You're right; assuming you really meant post #28...

    You're right; assuming you really meant post #28 the (red) wire connecting pin 4 to the capacitor+ (and then pin 2) is missing.
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    I think it's a 4016 'Fat 40' which use a...

    I think it's a 4016 'Fat 40' which use a 'universal' 80/40 board.
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    Radius is the same; the different offset is for...

    Radius is the same; the different offset is for single- and double-sided disks, the hole closer to 12 o'clock is for single density.
    See post #13:...
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    That's about right; the no-load AC voltage of the...

    That's about right; the no-load AC voltage of the 5VDC is 1/2 of the 18VAC between pins 1 and 5.

    And a correction: pin 3 is ground and connected to the transformer, but not to the DC connections 2...
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    Dave was assuming that it's connected to the...

    Dave was assuming that it's connected to the board.

    Your readings are fine; pin 3 is effectively not connected to either transformer winding. In any case you would not see 5VDC anywhere; if it...
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    Thanks; makes sense, maybe due to advances in...

    Thanks; makes sense, maybe due to advances in metallurgy and engineering and widespread use in the CNC industry.
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    I've always wondered: why do Teletypes and...

    I've always wondered: why do Teletypes and similar machines require oiled tapes while most computers used plain tape?
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    You say that removing the A5-9 jumper gave a...

    You say that removing the A5-9 jumper gave a signal on A5-8 but when I asked whether removing it made any difference you said "I did not see any difference yet when i cut that jumper."

    So, does...
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    If it's the only drive, after the twist on a...

    If it's the only drive, after the twist on a twisted cable, DS1, terminator in; hopefully the other jumpers are correct as is.
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    Sorry, in all this I missed that you'd removed...

    Sorry, in all this I missed that you'd removed and replaced the A5-9 jumper; is there a difference with it grounded or not? I think it should probably be disconnected.

    Re the CG ROM: I was...
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    ... and make sure you have a good ground. I'd...

    ... and make sure you have a good ground.

    I'd pull that jumper a5-9 to ground; looks like it should be high to load the RAM.

    Also it looks like some corrosion around there; wouldn't hurt to...
  16. Hi, I remembered this post of yours from last...

    Hi,

    I remembered this post of yours from last fall; I have an MTU board and a disk of stuff for it but unfortunately it was really inconvenient at the time to look for the disk.

    However, as I...
  17. Not very difficult; just watch for the tiny...

    Not very difficult; just watch for the tiny spring that closes the shutter.

    But why aren't you normally using the backup disks instead of the originals?
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    Well, it'll certainly be a challenge that could...

    Well, it'll certainly be a challenge that could keep you (and some of us) busy troubleshooting for a while ;-)

    I'd probably start by carefully documenting all the modifications to try to figure...
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    On a single-sided drive? Remarkable!

    On a single-sided drive? Remarkable!
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    IIRC the interfaces I worked with and still have...

    IIRC the interfaces I worked with and still have a few of were for the Praxis35 and a 101?
  21. Thread: L40SX Batteries

    by MikeS
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    Good point; 1 5/8 x 1 1/8 x 1/2

    Good point; 1 5/8 x 1 1/8 x 1/2
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    Where in Ontario? It's a big place, y'know...

    Where in Ontario? It's a big place, y'know...
  23. Thread: L40SX Batteries

    by MikeS
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    1,224

    Looks like a cordless phone battery; I use 'em in...

    Looks like a cordless phone battery; I use 'em in most of my systems:
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    - I believe the battery cover has been printed -...

    - I believe the battery cover has been printed
    - The AC adapter is 6V DC but with a negative center pin.
    - Cleaning battery terminals depends on battery type; try vinegar with a toothbrush, else...
  25. You're right of course, it had a 68000 and was...

    You're right of course, it had a 68000 and was probably a NEC after all. Should have looked more closely but that ROM board looked very similar.
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