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Type: Posts; User: Eudimorphodon

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  1. Replies
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    It's a stale memory, but I believe the soft power...

    It's a stale memory, but I believe the soft power control in old Macintoshes is also a pull-up instead of a pull-down, so it's definitely a thing people did.
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    Long and short of it definitely verify that your...

    Long and short of it definitely verify that your Model 4, whichever one of the two, can at least do cassette I/O reliably with itself. (The most basic test would be to boot it into Model III BASIC...
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    It's certainly possible that by 1986 IBM had hit...

    It's certainly possible that by 1986 IBM had hit the "Using up the last of the parts" stage of production and tossed in some 5160 power supplies to get the last few units off the end of the line,...
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    Unless you have some authoritative proof that the...

    Unless you have some authoritative proof that the PSU in the machine you're thinking of *wasn't* swapped out, well, lacking any specific literature for a specific market that says otherwise the April...
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    Woah. I apologize if I came off too harsh. I just...

    Woah. I apologize if I came off too harsh. I just remembered earlier in the thread you'd said you hadn't tried the TAPE100/CMD program yet, I was just thinking it'd be good to start there before...
  6. Yeah. One of these days I've been thinking it...

    Yeah. One of these days I've been thinking it would be interesting to set it up so I can NFS or ETHERDFS mount a working directory that's shared on the modern machine so I can skip the "virtual...
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    Both binaries tested on Tandy DOS 3.21 and 2.11...

    Both binaries tested on Tandy DOS 3.21 and 2.11 (and PC-DOS 7 to ensure no breakage with higher OS-es), and updated source and binaries pushed to the github repository. Thank you for the help!

    (In...
  8. Replies
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    I did some testing and the verdict seems to be...

    I did some testing and the verdict seems to be that the EMS2UMB.EXE file works on DOS 3.3 or later, but I do indeed get that "Bad or missing CON" error on 3.21 or 2.11. I wonder what changed between...
  9. The key there is having an editor and IDE you...

    The key there is having an editor and IDE you know and are proficient in, of course.

    Shooting the file over to compile does take literally five seconds or so including issuing the commands, so...
  10. Replies
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    Huh. I'll try it on some other DOS versions and...

    Huh. I'll try it on some other DOS versions and see if I can replicate it. That code wrapper that lets the EXE run from config.sys is pretty much a black box to me.
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    Radio Shack made a "baby" version of the TRS-80...

    Radio Shack made a "baby" version of the TRS-80 Color Computer called the MC-10. It used a different CPU (Motorola 6803 vs. 6809, not binary compatible) than the regular model but its BASIC was based...
  12. Recently when I was hacking together a couple...

    Recently when I was hacking together a couple assembly-language boot-time fixes to run on my Tandy 1000 my positively dreadful workflow ended up being something like this, since I have *no*...
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    So... the reason the Model I's cassette port ran...

    So... the reason the Model I's cassette port ran at 500 baud wasn't really related to how fast the machine's CPU ran. The bit rate was essentially based on a rough estimate as to what could be made...
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    Standard advice back in the day was to *replace*...

    Standard advice back in the day was to *replace* the PSU if you added a hard drive to the 5150, but so far as I'm aware IBM never sold one with either a hard drive or the bigger PSU.

    (They would...
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    Every unmolested 5150 I’ve ever seen had a 63...

    Every unmolested 5150 I’ve ever seen had a 63 watt power supply. So far as I’m aware it was standard equipment right up to the end.
  16. It has 64k on it so I'm going to guess Hercules...

    It has 64k on it so I'm going to guess Hercules compatible mono card. (I can't read the writing on the crystal, if it's 16mhz then it's pretty much a sure thing.)
  17. Replies
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    I'd probably recommend making a Tandy DOS 2.1...

    I'd probably recommend making a Tandy DOS 2.1 disk for testing, 3.x is pretty tight in 128k and I assume that's what you're using on the SX, but I doubt that's actually the problem.
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    A 1000 should be fine with any normal version of...

    A 1000 should be fine with any normal version of DOS.

    Are you testing with a memory card installed, or just the basic 128k motherboard? (Reason I'm asking: wondering if a memory card is installed...
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    Apparently some people are *very* passionate when...

    Apparently some people are *very* passionate when it comes to command-line syntax for taking a disk directory.
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    That "dump a cassette file into memory raw"...

    That "dump a cassette file into memory raw" program would be interesting to run against an ASCII Model 100 tape to see if it actually reads correctly with the Model III's BASIC ROM algorithm; is it...
  21. Yeah, I vaguely recalled after posting that the...

    Yeah, I vaguely recalled after posting that the last batch of CoCo2's had that upgraded 6847, but I decided that didn't really count since I don't think Radio Shack ever told anyone about the change,...
  22. The TRS-80 Color Computer line lacked hardware...

    The TRS-80 Color Computer line lacked hardware lower case until the Color Computer 3 came out in 1986. It was possible to "use" lowercase, sort of, because it could map lowercase letters to reverse...
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    It actually doesn't use an EBDA on an XT if you...

    It actually doesn't use an EBDA on an XT if you don't enable "full operating mode". I don't because EBDAs are incompatible with Tandy 1000s unless you pre-allocate a big chunk of memory to make sure...
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    Turning VGA memory into a DOS extension is a job...

    Turning VGA memory into a DOS extension is a job for VIDRAM.COM from the QRAM distribution. It'll extend conventional memory to 736k and you can toggle it on and off. (Remember, no graphics programs...
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    If all it takes is literally just overwriting the...

    If all it takes is literally just overwriting the value at 40h:13h with the new size I wonder how hard it would be to patch that into an XTIDE BIOS image. (On machines so equipped.) I could test...
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