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  1. The buildings where the mainframes were worked...

    The buildings where the mainframes were worked on, at that site were emptied out a few years ago, so I doubt that any docs are still floating around. :)

    Tom
  2. Strange coincidence, I was just out last night...

    Strange coincidence, I was just out last night with a friend of mine who works in that building for Unisys. Unisys is closing that building next month. :( RIP Burroughs!

    Tom
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    They are called DIP Shunts. TE Connectivity (Amp)...

    They are called DIP Shunts. TE Connectivity (Amp) is one source. A 16 pin shunt (8 positions) is part # 1825190-7. Sorry, can't figure out how to attach the datasheet for them.

    HTH,
    Tom
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    Sounds like bit 5 (32) in video memory is stuck...

    Sounds like bit 5 (32) in video memory is stuck High. Instead of displaying 0x41 (A), your displaying 0x61 (a), etc.

    Tom
  5. The DS1225AD is listed as a current production...

    The DS1225AD is listed as a current production replacement for DS1225Y. Digikey has them in stock.

    Tom
  6. Thread: Model 1400 LT

    by hornbetw
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    Here's the 1400 LT Service Manual if it helps....

    Here's the 1400 LT Service Manual if it helps. ftp://ftp.oldskool.org/pub/tvdog/tandy1000/documents/14ltserv.zip

    Tom
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    Enable OA was the standard office software for...

    Enable OA was the standard office software for the Marine Corps in the late '80s and early '90s for the "Green" (ground) side of the Corps, the "Blue" (aviation) side used the Navy standard software...
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    Is the small pcb the XRX mod? What makes it...

    Is the small pcb the XRX mod? What makes it different than any other rev?

    Tom
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    What is the 26-1008? Tom

    What is the 26-1008?

    Tom
  10. This monitor is a Sony broadcast video monitor....

    This monitor is a Sony broadcast video monitor. It isn't a television set, it doesn't appear to have a tuner. The connector is to connect a VTR/VCR up to it. Videotek is a company from Pottstown PA...
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    J22 & J23 are probably for 25 pin serial ports. ...

    J22 & J23 are probably for 25 pin serial ports.

    Tom
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    I thought IDE drives don't get Low Level...

    I thought IDE drives don't get Low Level Formatted. You skip the BIOS format and just FDISK and Format them in DOS.

    Tom
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    The NEC 780C-1 is the 4 MHz (Z80A) version of the...

    The NEC 780C-1 is the 4 MHz (Z80A) version of the Z80.

    Tom
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    I have a pair of Tandon 848-01 Mod IIs if you're...

    I have a pair of Tandon 848-01 Mod IIs if you're interested. I rescued them from a former coworker. He said they were installed new and used about 6 months back in the early '80s. They haven't been...
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    The modesty panel with the fan is on backwards. ...

    The modesty panel with the fan is on backwards. The fan is supposed to be behind the disk drives.

    Tom
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    Any chance you could post that font? Tom

    Any chance you could post that font?

    Tom
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    Digikey & Mouser both have TE (Alcoswitch) 8...

    Digikey & Mouser both have TE (Alcoswitch) 8 position (16 pin DIP) shunts, P/N: 1825190-7. Digikey is a few cents cheaper. The datasheet says 4,6,7,8,10 & 12 position parts are still active.

    HTH,...
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    A mask programmed processor for a Mac keyboard...

    A mask programmed processor for a Mac keyboard made in 1973 would be a miracle, the Mac wasn't designed until 1983.

    Tom
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    Given the drivers (UA9636) & receivers (SN75175),...

    Given the drivers (UA9636) & receivers (SN75175), it's an 8 port RS-422 card. It might be from a Point of Sale (POS) system.

    Tom
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    Curious, was there a Japanese version of the EI...

    Curious, was there a Japanese version of the EI or did they use the redesigned EI?

    Tom
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    Check...

    Check https://archive.org/details/radioshackhardwaremanuals?&sort=-downloads&page=2. There are at least 2 Model 4 Tech Manuals listed.

    Tom
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    The CRT in the Model 4 is the same as the Models...

    The CRT in the Model 4 is the same as the Models I & III. Amber tubes were available, but not from the Shack. I think Ian Mavric may have a few.

    Tom
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    Looks good! Tom

    Looks good!

    Tom
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    The Radio Shack Mini Amp uses a 4.7 uF/25V cap...

    The Radio Shack Mini Amp uses a 4.7 uF/25V cap with the positive connected to the amp.

    http://www.repeater-builder.com/radio-shack/277-1008/amp-schematic.gif

    HTH,
    Tom
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    There's another problem with Q1. As wired Q1...

    There's another problem with Q1. As wired Q1 doesn't do anything useful. It's supposed to convert the 3.3V data from the SD Card to 5V. The gate of Q1 should be connected to 3V3 without a pullup...
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