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Type: Posts; User: per

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  1. Replies
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    675

    There are some non-PC DOS releases that went...

    There are some non-PC DOS releases that went further, I have seen all the way up to 768KB conventional RAM for instance. However, most of those machines were phased out and replaced by PC-compatible...
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    169

    Looks like bit 6 of video-RAM is stuck high. You...

    Looks like bit 6 of video-RAM is stuck high. You can see it from the fact that all ASCII characters have been "OR 0x40"ed
  3. Replies
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    468

    This! On non-standard systems, some with more...

    This!

    On non-standard systems, some with more than 640k conventional DOS memory, things can get really interesting if programs just assume video memory to be present in the A or B segment.
  4. I will recomend taking a look at TH99, there...

    I will recomend taking a look at TH99, there should be settings for the 8 switch versions on there.
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    Code in Boot Sector

    I was looking at a disk image for the Tiki-100 the other day, and one thing that struct me is that in the end of the boot sector of the latest version of the system there's always the following...
  6. Thread: Erasing UV EPROMs

    by per
    Replies
    44
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    2,562

    Not even my upper mid-end programmer from the...

    Not even my upper mid-end programmer from the ealy 90's support those. The need for a negative routable supply would have made the design a lot more complex as well. Maybe some high-end programmers...
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    HP Vectra QS-series PSU pinout

    I got hold of a Vectra motherboard not too long ago, and am thinking about getting it up and running.

    This motherboard is very particular in that it has a 19-pin connector for the powersupply,...
  8. Replies
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    3,329

    Just curious, is it just the CPU or the whole...

    Just curious, is it just the CPU or the whole system that's overclocked?

    I would imagine the benchmark readings could be affected if the 8253 was increased in speed as well.
  9. Certainly a multifunction IO card with RTC and...

    Certainly a multifunction IO card with RTC and serial/parallel/gameport (the MIDI was a SoundBlaster-only thing if I haven't gotten it wrong). Not sure about if it got support for RAM tho, looks more...
  10. A similar board by Orchid could, if I remember...

    A similar board by Orchid could, if I remember correctly, hot-switch between the 286 and 8088 (mid-application on both) by pressing a given key-combination on the keyboard. It's been years since I...
  11. Replies
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    658

    How long did you wait? The 5150 doesn't show the...

    How long did you wait? The 5150 doesn't show the memory count during self-test, and getting to the point of the beep might take a few minutes if you have maxed out the memory.
  12. Replies
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    Pretty neat stuff! Saw that recently too. ...

    Pretty neat stuff! Saw that recently too.

    Here's the link to the specific post showing it working: https://twitter.com/TubeTimeUS/status/1197676720398069760
  13. Replies
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    It depens on the monitor, but have a look in the...

    It depens on the monitor, but have a look in the monitors manual. There's usually a technical spec section there with what sync types are supported. As mentioned, you're looking for "composite sync"...
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    832

    The PGC has RGB with a dedicated composite sync....

    The PGC has RGB with a dedicated composite sync. A lot of regular VGA monitors are capable of displaying the picture from a PGC with a simple 9-15 pin adapter.

    But as mentioned, most VGA cards use...
  15. Replies
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    1,765

    Theres what's probably a CGA clone, a...

    Theres what's probably a CGA clone, a multifunction card (RAM/serial port/parallel port/RTC), and a MFM hard disk controller.

    While these things can be obvious to us who's been in the hobby for...
  16. The website seems to be down. Any info on this?

    The website seems to be down. Any info on this?
  17. Replies
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    312

    This came out of an old liquid tensiometer, and...

    This came out of an old liquid tensiometer, and yeah passive backplane indeed. It's a pretty neat lightweight form-factor if you just need to throw a temporary XT-configuration together for whatever...
  18. Replies
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    966

    The pinout even matches the 9-pin VGA connector...

    The pinout even matches the 9-pin VGA connector used on a few systems, and adapter cables are readily available for cheap.
  19. Replies
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    Tempustech F82C100 card

    Recently I got hold of this interesting card. It sports a V20, and by the chipset it should be a PC compatible. However, trying it out this turned out more interesting than expected.

    Mainly, it...
  20. Thread: Scored a Dasher!

    by per
    Replies
    7
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    579

    I'm a little bit in the same boat. I don't often...

    I'm a little bit in the same boat. I don't often collect terminals, but the TDV2200-series terminals are really nice indeed.

    I saved a ND320, which they tired to dump at the university not too...
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    2,591

    The really early IBM floppy controller with tin...

    The really early IBM floppy controller with tin cans also use -5V if I am not mistaken. That's also something to check.

    You might also try a general purpose Floppy-controller in the XT. Doesn't...
  22. Replies
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    This. I once came across a pair of 5154's,...

    This.

    I once came across a pair of 5154's, one with a faulty video amp and one where a shorted cap had taken out the vertical amp. In the end I ended up swapping around the video amp module to...
  23. Replies
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    The stock PGC is slow enough for you to see a...

    The stock PGC is slow enough for you to see a frame being drawn, so there's absolutely room for improvement.

    Looking over the schematics, The CPU clock is only running the CPU, with the graphics...
  24. Congratulations on the find! One of the first...

    Congratulations on the find!

    One of the first things I'd do is to try to read the paper tape over to binary files, and then you might use a modern computer with a serial card (and maybe a...
  25. It's still sampling the bits 1:1 with the...

    It's still sampling the bits 1:1 with the modulation frequency on the disk, which might be a problem with some types of disks using non-standard modulation frequencies. I've in particular had...
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