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Type: Posts; User: Chuck(G)

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  1. Replies
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    ...and here's the internals of a regulated wall...

    ...and here's the internals of a regulated wall wart:
    59237

    Apologies for the somewhat out-of-focus photo, but you get the idea. There are 3 regulators --two on the larger outer heatsink and one...
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    I currently use Sci-Grip #3, but dichloromethane...

    I currently use Sci-Grip #3, but dichloromethane (methylene dichloride) should work equally well. If you can't get those, MEK from the paint store should do the job. Toluene should also work.
  3. Re-read and at least try to understand what I...

    Re-read and at least try to understand what I wrote. The reference frequency for either 8" SD or DD is 500KHz--and that's what IMD is faithfully reporting. The bit-rate of SD is half that of...
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    I was thinking about opening an old Zip drive...

    I was thinking about opening an old Zip drive wart. I'm pretty sure that that has a regulator in it. I've got a few modem linear "warts" with +5 -12 and +12 regulation. I'm looking at a...
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    Do you want to see the inside of one such wart...

    Do you want to see the inside of one such wart with 7805? I think I can manage it.
  6. The data rate is 250Kbit/second, but the clock...

    The data rate is 250Kbit/second, but the clock frequency is still 500KHz. Don't let this seeming discrepancy distract you, even if you don't understand it. IMD uses the clock frequency (500KHz)...
  7. You have modulation confused with bitrate and...

    You have modulation confused with bitrate and cell timing.

    A standard timing cell on 8" floppies is 2 µsec. or 500KHz. This does not correspond necessarily to bitrate.

    A single-density (FM)...
  8. Done that with WIn98SE on a Neoware CA19, 400MHz...

    Done that with WIn98SE on a Neoware CA19, 400MHz Esther CPU, still have the system if you want to verify operation. Used it with an external modem for junk call screening.
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    That's pretty common--the idea is that the...

    That's pretty common--the idea is that the voltage delivered will fall within a loose spec once loaded. Regulated warts tend to be in the 0-1A current range, mostly due to using the venerable 7805...
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    I found that you can get these with or without...

    I found that you can get these with or without the headers already attached, so if you wanted to make a bottom-connect project with it, you could.
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    There are many sellers of this board...

    There are many sellers of this board. More features than the "discovery" kits.
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    I don't believe that most switching cheap wall...

    I don't believe that most switching cheap wall wart DC supplies are designed for much more than charging batteries (most common) or running purely digital hardware. I'll have to dig through my "big...
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    If you can deal with the documentation, the 407...

    If you can deal with the documentation, the 407 boards are a good platform for retro projects. You get a 168MHz CPU with a 192KB RAM and a half-meg of flash--the boards add support for the...
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    Yup on the sector hole spacing. All (but for...

    Yup on the sector hole spacing. All (but for some oddball Memorex very vintage stuff) HS 8" are 32 sector. So the drive uses a couple of one-shots to differentiate the timing between sectors and...
  15. Depends on what floats your boat--finding a...

    Depends on what floats your boat--finding a specific floppy for me is a chore. Doing this from memory is easy.

    I've also got a small DOS program that will do a secure wipe (as many passes as you...
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    No, some drives can--they separate the sector...

    No, some drives can--they separate the sector hole signals from the index hole signal and route them to a different output pin. You could additionally select how the 32 sector holes were to be...
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    Just so--forget looking for an index pulse on a...

    Just so--forget looking for an index pulse on a test point--see what it is on the drive connector when (you think) the drive is selected.
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    What drive select are you using? I'm not...

    What drive select are you using? I'm not familiar with the dbit adapter, but it may require that you use the second drive select rather than the first.
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    If you're not intent on writing floppies that...

    If you're not intent on writing floppies that will be used by others, a good, known floppy with data may be all that you need. If you're hooking one to a PC, just use ImageDisk's alignment function....
  20. I note that a mining motherboard locally has been...

    I note that a mining motherboard locally has been available for the asking price of $20. It's a Biostar TB250-BTC board--even at $20, it's no deal, as it retailed for much less than $100.
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    Bakelite is very durable. Too bad that it wasn't...

    Bakelite is very durable. Too bad that it wasn't used for 80's computer cases.
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    There's also the matter of filler in ABS and the...

    There's also the matter of filler in ABS and the like used for casework. Can be just pigment or even silica. No guarantee on getting that right on recycled stuff.

    Modern high-impact stuff uses...
  23. I just use the following debug script: ...

    I just use the following debug script:


    -f200l200 0
    -a100
    0931:0100 mov ax,0301
    0931:0103 mov bx,200
    0931:0106 mov cx,1
    0931:0109 mov dx,80
    0931:010C int 13
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    @tipc, how about some results of your own to back...

    @tipc, how about some results of your own to back your statements up? :)
  25. Why not use ultrapure lamp oil? (triple-filtered...

    Why not use ultrapure lamp oil? (triple-filtered paraffin/kerosene). Much cheaper--odorless and used as a lightweight lubricant.
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