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Type: Posts; User: Chuck(G)

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  1. Replies
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    No, the 8237 is a very quirky...

    No, the 8237 is a very quirky southbridge-with-ATA/SATA support. Linux gave up supporting it a few years back, because the driver was a mess and nobody wanted to re-write it. OpenBSD still, as far...
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    You lost me--what VT8237...

    You lost me--what VT8237 are you looking at?

    My reference shows that the VT8237 provides an LPC interface for a "super i/o" chip. usually a VT1211, which does support 2.88M 1Mbps transfer rate.
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    3) VIA 8237 IIRC, that's just the southbridge...

    3) VIA 8237

    IIRC, that's just the southbridge chip. What floppy controller is it attached to? The LPC VT1211 is pretty common, but isn't the only choice. If so, it does support 2.88M.
  4. Okay, if the problem is stiction and the spindle...

    Okay, if the problem is stiction and the spindle does not want to rotate and there's no brake, you're likely to rip the heads right off the arms if you try to force things. Sometimes a smart rap on...
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    Check your BIOS setup. Three questions: 1)...

    Check your BIOS setup. Three questions:

    1) Does your system have floppy support integrated on the motherboard, or is it provided through an expansion card?
    2) Does it have a setup option for...
  6. Hmm, interesting. The ST412s that I had were...

    Hmm, interesting. The ST412s that I had were pretty early then.
  7. When in doubt, it's safe to go by the D765A...

    When in doubt, it's safe to go by the D765A datasheet, since it's the FDC in (overwhelmingly almost all) PCs.

    I think it's safe that for driving old floppies (and particularly more than one of...
  8. All ST-412s have a spindle brake (see the OEM...

    All ST-412s have a spindle brake (see the OEM manual on Bitsavers--it's prominently mentioned).
  9. C&F are generally very reliable. I trust that...

    C&F are generally very reliable.

    I trust that you notified your buyer that the 60Hz and 50Hz units are not the same.
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    Are these any better than the Keystone eyelets?...

    Are these any better than the Keystone eyelets?

    There are also these folks
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    This might be useful for PCB repair

    Schmartpatch

    Found it interesting; have no personal experience with the stuff.
  12. I see floppy (missing D765 FDC), dual comm (one...

    I see floppy (missing D765 FDC), dual comm (one 8250 and line interface missing) and parallel and clock.
  13. I don't know--it all depends on the installed ROM...

    I don't know--it all depends on the installed ROM in your system.
  14. Silly question, I know, but here goes: Have you...

    Silly question, I know, but here goes: Have you checked that the spindle brake is functioning correctly? I've seen both Tandon and Seagate drives where the spindle brake has failed. The normal...
  15. Thread: Microkit 8/16

    by Chuck(G)
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    They were pretty standard back in the day. Even...

    They were pretty standard back in the day. Even my SW radio has one.
  16. Thread: S-100 bad day

    by Chuck(G)
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    Not an uncommon design fault--the Altair 8800...

    Not an uncommon design fault--the Altair 8800 also has the AC switch on the front panel, sharing the PCB with the logic traces.
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    I've got some of that, but now have only an empty...

    I've got some of that, but now have only an empty aerosol can of TF. It was good stuff for cleaning--used by the tank-car lot in the old days in semiconductor manufacturing. It may still be legal...
  18. It all depends on the BIOS code and any code in...

    It all depends on the BIOS code and any code in ROM that actually boots the system upon reset. There may be a jumper or a check for a specific keypress to change the default boot device.

    As an...
  19. The Hawk drives I have are all SCA. (2 and 4 GB)

    The Hawk drives I have are all SCA. (2 and 4 GB)
  20. Does the drive behave on a standard "tweener"...

    Does the drive behave on a standard "tweener" floppy controller? In my own code, I've found that most floppy drives are edge-sensitive. The 765 uses a pulse width of 6 µsec.
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    Used to be Carbon tet or Freon TF for cleaning. ...

    Used to be Carbon tet or Freon TF for cleaning. Now long gone.
  22. I've seen the stepper drivers fail on some Tandon...

    I've seen the stepper drivers fail on some Tandon drives. Don't have enough experience with the Panasonic ones, though.
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    What are you using to wrap? G-D electric gun? ...

    What are you using to wrap? G-D electric gun? It's pretty hard to screw up a modified wrap using one of those.
  24. There are a few "undelete" utilities in the...

    There are a few "undelete" utilities in the SIMTEL20 archive (search it). However, much depends on (1) how fragmented the original file is and (2) what files you've written after the file was...
  25. Note that the drive I pointed to is ultrawide...

    Note that the drive I pointed to is ultrawide SCSI2; If you've got the Jaz Jet Ultrawide (68 pin connector), you're good. The 50 pin connector is a narrow SCSI. You can use a narrow SCSI drive...
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