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  1. Thanks. Those are HP 150 disks; code extracted...

    Thanks. Those are HP 150 disks; code extracted from those may be useless, but data not necessarily so. ;)


    Yep. I can't think of a publicly available emulator that consistently implements the...
  2. Do you guys happen to know how data can be...

    Do you guys happen to know how data can be extracted from such images? They're seem to be out there in Teledisk format, but attempts to convert them to IMD or raw formats for extraction (e.g. using...
  3. I'm signed in and it's giving me a 404

    I'm signed in and it's giving me a 404
  4. Thread: Pseudo 3d ASCII

    by VileR
    Replies
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    217

    That's correct... you can use either one of those...

    That's correct... you can use either one of those bits, but the behavior is different:

    Bit 0 is the real indicator for when it's "safe" to write to CGA RAM. It signifies "blanking", which is...
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    Hm, yes, this is a different problem. But that...

    Hm, yes, this is a different problem. But that might depend on more than 512 KB being *available*... I do recall something about a bug where a signed comparison is done on the amount of free memory...
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    Having less free memory might actually help. ...

    Having less free memory might actually help. Some old compilers, packers, etc. produced buggy code, which fails to allocate memory if DOS finds enough space for the program in the first 64K of RAM....
  7. Hm, I assume it doesn't do anything funny to INT...

    Hm, I assume it doesn't do anything funny to INT 16 (hooking/revectoring) before it makes those calls?

    @kdr: Trixter has already confirmed that the game runs on his 5160, and I can confirm...
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    Sticky: IIRC there was nothing to suggest that it can do...

    IIRC there was nothing to suggest that it can do any switching at all under software control - only manually. But then, that thing came in a used 5155 with no documentation whatsoever. The actual...
  9. Might the freeze be related to the keyboard...

    Might the freeze be related to the keyboard (unhandled keystrokes filling up the buffer so the 5155 ends up beeping at you)?

    See, I just remembered this age-old question:...
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    Okay, that looks like a consequence of the...

    Okay, that looks like a consequence of the MBC-775's text mode font being a bit different from that of the IBM CGA. Which is something I already mentioned, so I should've connected the dots there....
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    Possible clock discrepancies aside: did you try...

    Possible clock discrepancies aside: did you try playing with the settings on the initial calibration screen some more? in particular changing "CGA model" to "new"?
  12. Replies
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    Since you were going to run 8088 MPH: I don't...

    Since you were going to run 8088 MPH: I don't know much about the MBC-775, but it looks like the internal CRT shows RGB video - does this thing have composite video out?

    If so, it'd be nice to...
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    Sticky: I guess one thing you could do is to frankenstein...

    I guess one thing you could do is to frankenstein a much bigger ROM chip in place of the 8K character generator, provide some kind of switching mechanism to change the address line selection at will,...
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    Try the free version of IDA 5. After that recent...

    Try the free version of IDA 5. After that recent thread about the PS/2 ROM dump, I've used that to disassemble bits of the Model 30-286's VGA BIOS code to answer some of my own questions.

    It may...
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    "Most authentic" - if it's actually a brand-name...

    "Most authentic" - if it's actually a brand-name XT clone, it might have had an OEM release of MS-DOS sold with it.

    "Best" - I guess there's a trade-off between conventional memory footprint and...
  16. Thread: Covidtron 2020

    by VileR
    Replies
    2
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    293

    Well, if you want something that's "topical" BUT...

    Well, if you want something that's "topical" BUT also runs on an old-school machine, try https://youtu.be/ctbowRE2eyY

    ;)
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    Based on the scant information that's available,...

    Based on the scant information that's available, I assume that the first segment of the 128K sets is mapped to E000, and constitutes the 'ABIOS' extension present in the 286/386 machines for OS/2...
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    I was going to bring up the size question. This...

    I was going to bring up the size question. This dump (can't recall where I found it) has the 30F9579/80 pair as 64K each, plus the 128K file interleaved from both:

    63817

    The "extra" segment...
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    Thanks, that was more or less the suspicion. So,...

    Thanks, that was more or less the suspicion. So, MCGA *does* have something to show for itself that VGA can't. ;)

    I'd assume that mode 13h runs as expected on that monitor, just without the...
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    Most of that should be documented in the tech...

    Most of that should be documented in the tech refs, but the reason I asked also happens to be MCGA-related.

    Specifically... the tech refs only document two different types of monitor being...
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    Anyone know if the Model 30 BIOS ever had a...

    Anyone know if the Model 30 BIOS ever had a listing (or a disassembly) published anywhere?

    I suppose that's a big fat "no" at least from IBM's side, since that was right when they furiously...
  22. This seems to be one of those machines where the...

    This seems to be one of those machines where the BIOS isn't present on a ROM but loaded from disk when you boot DOS... hence, the MSDOS.SYS suggestion above.
  23. How did you decompile? There's OBJASM...

    How did you decompile? There's OBJASM for one (you can select "B:" and "save" to grab a disk image).

    AFAIK on these machines the BIOS is part of MSDOS.SYS, so you could also pull that from a boot...
  24. Yes. More generically, the rule to keep in mind...

    Yes. More generically, the rule to keep in mind is that (ES + BX>>4):0000 points to the same address as ES:BX... as long as the last nybble of BX is 0.

    The last time I had to fill some 400K of...
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    I would think UVC is precluded from being the...

    I would think UVC is precluded from being the active agent in sun bleaching - doesn't the ozone layer/atmosphere absorb practically all UVC?
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