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  1. 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...
  3. 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...
  4. The Hawk drives I have are all SCA. (2 and 4 GB)

    The Hawk drives I have are all SCA. (2 and 4 GB)
  5. 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.
  7. 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.
  9. 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...
  10. 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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    Superbee DAM changed when?

    I've got a bunch of Superbee single-sided (30x128 MFM on track) floppies and I've noted that *some* of them use DAMs of FAh for *some* sectors, but not all.

    Anyone know the genesis of this...
  12. Nope, not yet--I've got a lot on my "to do" list...

    Nope, not yet--I've got a lot on my "to do" list and this barely breached the bottom rung.

    Thanks for letting me know.
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    See my posting some time back on making your own...

    See my posting some time back on making your own very thorough disk eraser from old microwave magnetron magnets. Even though I have an AC powered VHS bulk eraser, the magnet one does a great job.
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    When I first got going with my own wirewrap, back...

    When I first got going with my own wirewrap, back in the mid-70s, I used TI mid-height sockets. I figured that they, being gold-plated and all would be wonderful. Boy, was I wrong! they'd...
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    Sorry guys; the only Monroes I have are for the...

    Sorry guys; the only Monroes I have are for the System 2000. (CP/M-86)
  16. Does 286 protected mode (e.g. Windows 286) work...

    Does 286 protected mode (e.g. Windows 286) work on it?
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    I'll have a look--I've got some 8820 disks, but...

    I'll have a look--I've got some 8820 disks, but not sure if they boot.
  18. There are plenty of DDS/DAT drives on eBay for...

    There are plenty of DDS/DAT drives on eBay for cheap.

    Here's a seller with NOS HP DLT/VS 80 SCSI drives for not a lot. (They're UW SCSI-2, so should not be a problem). And they're half-height...
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    Thanks for that--when I get a little time, I'll...

    Thanks for that--when I get a little time, I'll have a careful look.
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    Yup. Sold the program to a security outfit. ...

    Yup. Sold the program to a security outfit. Made a nice little pile of cash. Last version, IIRC, was 2.21.
    FWIW, that was 20 years ago.
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    One of the reasons that I write my own tools. :)

    One of the reasons that I write my own tools. :)
  22. Exactly--the caution here is not to go overboard....

    Exactly--the caution here is not to go overboard. You can get DDS4 and DDS5 tape drives that are fed with differential ultra640 SCSI, which would be expensive overkill--your P3's disk could never...
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    You can easily solve this problem two ways. The...

    You can easily solve this problem two ways. The first is to initialize the timer to 0 before you start your loop. That way, you know what the initial value is and you need only check the current...
  24. For those, I'd need an Apple II ;)

    For those, I'd need an Apple II ;)
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    Personally, I preferred the times when the...

    Personally, I preferred the times when the computer was the desk:

    http://www.tronola.com/assets/images/CDC-160_computer_500.jpg
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