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  1. My point was that unless you pay someone to put...

    My point was that unless you pay someone to put it together for you a raspberry Pi or anything else (and I guess I got confused by the repeated invocation of Intel-based Pi-like-things as if they...
  2. Have to admit I'm left scratching my head exactly...

    Have to admit I'm left scratching my head exactly how buying a single-board computer automatically helps with this situation. (Granted we have no idea what this situation even *is*.) If the person is...
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    Looking back it feels like Christmas 2018 was...

    Looking back it feels like Christmas 2018 was their last Hail Mary attempt to pull back from the Event Horizon of the black hole that had been inexorably tugging on them for years. They were decently...
  4. This question requires a lot more information to...

    This question requires a lot more information to answer meaningfully. (The big one being the exact vintage and platform.) I've successfully played with LPT redirectors on my lowly Tandy 1000 to print...
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    You'll probably need to bake your own BIOS if you...

    You'll probably need to bake your own BIOS if you leave out DMA.

    Bad suggestion: I think there's a disassembly of the original Tandy 1000 BIOS out there, those machines have a conditional in their...
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    This is off the top of my head, but I'm...

    This is off the top of my head, but I'm reasonably certain that with the 808x all addresses are byte-sized, which means that:

    * 16-bit transactions can only happen against "even" addresses, and...
  7. The Compaq's monitor is indeed not composite, it...

    The Compaq's monitor is indeed not composite, it has an analog video line for the grayscale and separate sync lines. But for the record, the reason the 5155 has that "trashed text" issue isn't really...
  8. Shadow mask pitch is also a significant factor...

    Shadow mask pitch is also a significant factor when you get down to sub-13" color CRTs. Most tubes that small just can't physically quite do 640 vertical lines with complete clarity. If the monitor's...
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    Between the info on that page about making custom...

    Between the info on that page about making custom fonts for the terminal and pictures of the display showing pretty wide "scanlines" I think its vertical resolution is closer to 300 lines, but I have...
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    Does anyone know the specs of the video output of...

    Does anyone know the specs of the video output of the VT320? Several sources repeat that its resolution is "800x500", but that doesn't vibe with the information here saying the character glyphs were...
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    I second this theory. The '374 is the "clocked"...

    I second this theory. The '374 is the "clocked" version of that type of latch, I suspect it's set up so it latches when it receives a "strobe" signal from the keyboard.
  12. Thanks! I’m actually kind of amazed how ‘easy’ it...

    Thanks! I’m actually kind of amazed how ‘easy’ it was to get honest-to-goodness PHI clock sync working for video, and I’m kind of proud of the brainwave I came up with to enable using unified memory...
  13. Poll: ... it's sad, I'm actually considering the idea...

    ... it's sad, I'm actually considering the idea of using a 15ns 32kx8 SRAM as a keyboard converter for the Commodore hackclone project because even though it would only be using 10 bytes of it the...
  14. Poll: I have vague memories of reading once that it was...

    I have vague memories of reading once that it was standard with TRS-80 key scans to read the "255" row (which is activating all the row lines at once) to see if "any key" is pressed down and then...
  15. Poll: I was mulling over the idea of using dual-port...

    I was mulling over the idea of using dual-port memory for a TRS-80 keyboard matrix converter instead of one of those analog matrix switches, but it seems like a potential drawback is if you want to...
  16. Update on the PET(-like) video card project: It's...

    Update on the PET(-like) video card project: It's officially a computer now. As of Friday I can run an ancient version of the PETTESTER ROM I wrote back in 2011 on the breadboard after interfacing a...
  17. I think people get confused comparing the 6845 to...

    I think people get confused comparing the 6845 to more “complete” graphics chips like, I dunno, a Commodore VIC. *All the 6845 does with RAM* is increment a set of address lines according to a...
  18. Graftabl only works on CGA in graphics mode, IE,...

    Graftabl only works on CGA in graphics mode, IE, when using software mode to draw “pictures” of letters. CGA likewise doesn’t actually support redefinable “text mode” characters. A completely...
  19. A real MDA only has 4K of RAM on it and every...

    A real MDA only has 4K of RAM on it and every speck minus 96 bytes is needed for the character and attribute buffer. So, no, no redefining character sets unless you build a hardware hack that can...
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    Yes. That would definitely make it not compatible...

    Yes. That would definitely make it not compatible with the OP's Tandy 2000 Digi-Mouse interface without surgery.
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    An Amiga or Atari ST mouse may also work. It...

    An Amiga or Atari ST mouse may also work. It looks from the schematics that the Digi-Mouse port uses the standard quadrature mouse lines (XA/XB/YA/YB/SW1/SW2/SW3) so there's a good possibility almost...
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    A look at the schematics for the Digi-Mouse board...

    A look at the schematics for the Digi-Mouse board for the Tandy 1000 suggests that you might be able to adapt a Microsoft-style "Bus Mouse" to work with just a passive adapter/changing the plug. Take...
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    I wonder how common the second-sample behavior is...

    I wonder how common the second-sample behavior is verses strict 5170 compatibility. Strictly speaking there never was an "official", universally-ratified, non-draft specification for ISA; they *kind*...
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    There is a timing diagram here that suggests...

    There is a timing diagram here that suggests that's exactly what happens. Or, sort of, anyway. it actually shows M16 getting sampled twice with this footnote:



    It also says this:



    So,...
  25. I've blabbed about them before, but I'll point...

    I've blabbed about them before, but I'll point out again that my experience with the very inexpensive SD-to-PATA cards they sell in both 40 and 44 pin form factors has been uniformly positive, and...
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