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  1. Replies
    27
    Views
    501

    Kinda interested in the question of...

    Kinda interested in the question of compatibility. Does PCjr-specific software run out-of-the-box on the JX? How about the other way around (excluding software meant for the Japanese model, of...
  2. I've *heard* (though haven't confirmed) that...

    I've *heard* (though haven't confirmed) that in-depth knowledge of x86 assembly language is still quite valuable in the fields of hardware/software security research.

    Being familiar with the...
  3. Thread: 720x348 on VGA?

    by VileR
    Replies
    9
    Views
    391

    Dunno - I'd agree with 720x350... I'm counting 9...

    Dunno - I'd agree with 720x350... I'm counting 9 scanlines for the capital letters and 5 scanlines of spacing, so the height would be 14; I'm not so sure about width, but the horizontal spacing looks...
  4. I have a 5153 on the way, so for the time being...

    I have a 5153 on the way, so for the time being I'm not looking any longer. But in the not-exceedingly-unlikely chance that it arrives in jigsaw-puzzle form, I will update.
  5. Those are all good points. But with the...

    Those are all good points. But with the inevitable costs of packing/shipping such a thing, I should probably look for a unit with less question marks about it.

    So, still looking for:
    * an IBM...
  6. Thanks. I understand that as referring to a...

    Thanks. I understand that as referring to a small percentage of all electrical equipment; this one is more specific to devices with a power transformer in the AC input stage:...
  7. Dang... looked at the schematic for the HX-12,...

    Dang... looked at the schematic for the HX-12, and it uses a power transformer rather than a switching supply. So it looks like a bad idea to feed it a lower AC frequency than it was designed for.
  8. Looks like "イホウ株式会社" (yay for...

    Looks like "イホウ株式会社" (yay for https://kanji.sljfaq.org) which would be "Iho Corporation", probably not much help though.
  9. That's still far more reasonable than the €310...

    That's still far more reasonable than the €310 quote from the eBay guy. :)

    Do you happen to know if the HX-12 can be safely powered from the XT's auxiliary power output?

    Reason I'm asking - the...
  10. Wanted: IBM 5153 Color Display (or a look-and-workalike - PGS HX-12?)

    I'm looking for a CGA monitor for my 5160, in good/working condition. Trying here because I've about given up trying to source one from the usual channels.

    Since the machine is IBM, I'd prefer the...
  11. ...I see what you did there. :D Thanks for...

    ...I see what you did there. :D

    Thanks for making the change, @mbbrutman.
  12. I do that most of the time, but everyone...

    I do that most of the time, but everyone shouldn't be expected to double-check everything down to image quality. With the concept of "attachments", people add files and expect them to stay as-is. ...
  13. I second the original request. It seems that the...

    I second the original request. It seems that the problem is exacerbated by the fact that no explanation/warning is shown during the image upload process. So the uploading user (1) cannot make an...
  14. This may or may not be related, but elsewhere I...

    This may or may not be related, but elsewhere I described a different problem (bug?) related to MODE.COM going resident, although it had to do with display settings. That was with DOS 6.x, but it...
  15. Replies
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    1,741

    I guess it'd have to be this:...

    I guess it'd have to be this: https://int10h.org/blog/2019/05/fontraption-vga-text-mode-font-editor/

    Written in fasm; everything included, it's (...*counts*...) 7334 lines of code, 66 different...
  16. Replies
    41
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    3,077

    All three parts are online: Pt. 1 -...

    All three parts are online:

    Pt. 1 - https://archive.org/details/PC_Tech_Journal_vol02_n04/page/n57
    Pt. 2 - https://archive.org/details/PC_Tech_Journal_vol02_n05/page/n171
    Pt. 3 -...
  17. My go-to would've been Abrash's Zen Timer, which...

    My go-to would've been Abrash's Zen Timer, which is quite general-purpose, though if you have your own to share I'm always interested in looking at different approaches.


    Yep, that's what I'm...
  18. Hah, thank you for those. I wasn't prepared for...

    Hah, thank you for those. I wasn't prepared for the I/Os sneaking up on me - seems like both of your First Rules are validated by the conclusions in this thread.

    I routinely do the DEBUG -a/-u...
  19. Thanks for the replies - appreciated! ...

    Thanks for the replies - appreciated!

    @commodorejohn: a destructive operation is perfectly good actually; I should've made my example overwrite the background. Re: cost of branching, on the 8088...
  20. True, some unrolling will get rid of one major...

    True, some unrolling will get rid of one major cycle-eater (loop - 18 cycles), but doing a conditional jump on each word is still 16 cycles a pop (if taken; 4 otherwise). I have the nagging feeling...
  21. 8088 optimization question (eliminating branches)

    Consider the following scenario: let "background" and "foreground" be two layers of visual data, composed of 16-bit values. I'd like to merge them as follows - for each offset, if foreground...
  22. Replies
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    1,000

    I assume that those protection methods didn't...

    I assume that those protection methods didn't need a *precise* 5150/5160 system speed, so a moderate slowdown was enough. Perhaps 4.77 MHz just happened to do the trick on a 286, and that rate was...
  23. Replies
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    I recall more than one an old review of earlier...

    I recall more than one an old review of earlier 286/386 machines (mid-late 1980s), claiming that they could automatically clock down to 4.77MHz when the floppy disk drive was accessed. Supposedly...
  24. Thread: Bluetooth is bad

    by VileR
    Replies
    33
    Views
    1,352

    Sorry to hear you're being forced to choose one...

    Sorry to hear you're being forced to choose one evil over the other, but something tells me that's not the case for everyone. ;)
  25. If you're talking about the 1984 MUSE game, I...

    If you're talking about the 1984 MUSE game, I just gave it a spin on my XT. It's not exactly as you describe, but when I start a new game, it draws the starting room (slowly enough), immediately...
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