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  1. Replies
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    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.
  2. Replies
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    20,637

    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
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    457

    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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    457

    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...
  5. Replies
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    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...
  6. The website seems to be down. Any info on this?

    The website seems to be down. Any info on this?
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    229

    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...
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    779

    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.
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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...
  10. Thread: Scored a Dasher!

    by per
    Replies
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    485

    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...
  11. Replies
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    2,377

    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...
  12. Replies
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    1,613

    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...
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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...
  14. 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...
  15. 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...
  16. Replies
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    399

    It looks very much like a run-of-the-mill...

    It looks very much like a run-of-the-mill multifunction card, very common in 8088 systems limited to 256KB RAM on the motherboard. It's maybe even a direct clone of the AST SixPakPlus.

    A card like...
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    1,535

    One of the PALs decide on the memory mapping,...

    One of the PALs decide on the memory mapping, which might possibly overlap with VGA or CGA or even the top part of conventional memory.

    When it comes to using the card, you probably need to setup...
  18. Replies
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    It's a Number9 computer Revolution 512x32 card....

    It's a Number9 computer Revolution 512x32 card. One plug for each R/G/B and V/H sync. Don't remember what the manual said about the 6th plug, but might be external sync for the optional genlock...
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    The C64 is a power-hog, so 0.7A is not unheard...

    The C64 is a power-hog, so 0.7A is not unheard of.

    When it comes to "black screen", it can be a whole lot of things. You've already ruled out the PSU, but I'd also check the onboard 7805 in the...
  20. It's only the same if the VGA BIOS and clock...

    It's only the same if the VGA BIOS and clock generators are the same as well.
  21. It's importaint to remember that CRTs generate...

    It's importaint to remember that CRTs generate video in a very different way than modern flat-panel displays. In modern displays the analog signals have to be converted back into a bitmap before...
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    Up untill about 84/85, Commodore had a...

    Up untill about 84/85, Commodore had a manufacturing error on some of their ICs. They where using the wrong amount of additives in the glass sealing the die, and the aluminum traces on the upper...
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    Btw, I meant 127 byte header on the CPT file! Not...

    Btw, I meant 127 byte header on the CPT file! Not 128.
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    Possibly yes, if the dsk image has it's sectors...

    Possibly yes, if the dsk image has it's sectors laid out in the order they appear on the track. Soft-sectoring was quite common for CP/M, in particular for hard-sectored formats since you can't do...
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    Almost. Removing the 128-byte header would give...

    Almost. Removing the 128-byte header would give you a disk image, but to get the true 1:1 disk-image you have to shuffle around the sectors to redo the soft-sectoring.
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