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  1. The CAGE Code ( 28528 ), IDs the manufacturer as...

    The CAGE Code ( 28528 ), IDs the manufacturer as ITT Industries. The part # (1135509G2) matches with the general format of their part #s. I'd guess it's part of a piece of avionics equipment for...
  2. Sticky: Definitely military, probably avionics. The...

    Definitely military, probably avionics. The board is similar in design to some of the PCBs in the AN/UYK-20 computer used in the ATC Radar I worked on in the Marines. The metal frame allows for...
  3. The m4p GA has the same adjustment in it. The...

    The m4p GA has the same adjustment in it. The Tech Ref for both 4ps are available on Archive.org.

    Tom
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    Ferrochrome, I noticed that you didn't say...

    Ferrochrome,

    I noticed that you didn't say that "the SX won't boot with the XT-IDE removed." Pull the XT-IDE out and see if the SX boots normally off the floppy. That should simplify figuring...
  5. Sorry to necropost. Did you ever receive the...

    Sorry to necropost. Did you ever receive the 1000A Supplement? If so have you scanned it by chance? I wouldn't mind getting a copy of it.

    Tom
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    As long as the plated through holes are ok, no...

    As long as the plated through holes are ok, no solder on top shouldn't matter. You don't have an interrupt selected. The XT should need one.

    Tom
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    If you have a scope, you could check RAS*/CAS* &...

    If you have a scope, you could check RAS*/CAS* & MUX* to see if they are being generated properly. Those signals are generated by the RAS* signal using a digital delay line, it might have gone bad....
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    I stand corrected. :-) I never dealt directly...

    I stand corrected. :-) I never dealt directly with this mod, my E/I is the new layout with the buffers built in.

    Tom
  9. Most pre-built images have the floppies mapped as...

    Most pre-built images have the floppies mapped as drives 6 (drive0) & 7 (drive 1).

    Tom
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    Do you have the round DIN plug or do you just...

    Do you have the round DIN plug or do you just have the buffered cable with the black box on the ribbon cable? The DIN plug required cuts in the keyboard and the EI to remove the signals from the...
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    By "Buffer Dongle" do you mean the 6-Pin DIN...

    By "Buffer Dongle" do you mean the 6-Pin DIN cable? If so, the RAS/CAS/MUX signals have been cut to the EI connector. Without those signals, the memory in the EI can't be accessed.

    Tom
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    Computer User Groups Article

    Came across this link https://arstechnica.com/information-technology/2020/08/the-golden-age-of-computer-user-groups/ via the PLUG (Philly Linux User Group) mailing list. Enjoy!

    Tom
  13. Doesn't The Norton Utilities have a utility to do...

    Doesn't The Norton Utilities have a utility to do check for bad sectors and move data of of them?

    Tom
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    Isn't it just a rebadged HP 7475A? The DIP...

    Isn't it just a rebadged HP 7475A? The DIP switch settings should be the same.

    Tom
  15. I could use a pair for my 1000A. Tom

    I could use a pair for my 1000A.

    Tom
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    I remember Pete Cetinski mentioned a mod for the...

    I remember Pete Cetinski mentioned a mod for the Tandy drives, check the Model 2 Archives for info. Not sure if this is the same mod as your drive has.

    Tom
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    The first pic looks like you have no HSYNC/VSYNC...

    The first pic looks like you have no HSYNC/VSYNC just like #6 in the other thread points to. The second pic looks like the normal garbage screen that happens when you boot with an EI and no floppy...
  18. The damage visible in the first photo looks more...

    The damage visible in the first photo looks more like the cable was crushed between one of the expansion cards and the top of the case.

    Tom
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    About 5 years ago, my daughter and her husband...

    About 5 years ago, my daughter and her husband rented a storage unit in Lancaster, PA. The storage facility had some kind of access control system hooked up to the storage units that used an Apple...
  20. Is the DIN plug 5 or 6 pins? The DIN mod used a 6...

    Is the DIN plug 5 or 6 pins? The DIN mod used a 6 pin connection I thought.

    Tom
  21. There are actual serial port floppy drives that...

    There are actual serial port floppy drives that existed. The external 3.5" drive for the Model 100/102 (Tandy TPDD) is one of them. There are emulators for that drive, such as the "NADSBox" that...
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    The 32x8 FIFO chip is probably for the SC-01...

    The 32x8 FIFO chip is probably for the SC-01 Speech Synth chip. My guess is that a Mod I Level 2 keyboard plugs into this box to expand it. The SC-01 is most likely used to reproduce the Speech...
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    Kester 186 is your friend! You can get it through...

    Kester 186 is your friend! You can get it through Amazon.

    Tom
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    Could be an interface for an engine control...

    Could be an interface for an engine control module. EEC is a Ford(?) interface to the Engine Controller that predates OBD-II.

    Tom
  25. Of course it's on the other side of the country! ...

    Of course it's on the other side of the country! The LP Stand is the only piece I didn't purchase for my Model I setup back in the day! Would look good next to my Model I Desk. :)

    Tom
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