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Re: MartyPC

Posted on 2024-05-15, 19:58

in PC Emulation
Isn't the IBM AT the last official IBM XT-compatible motherboard ROM BIOS requiring cycle-accuracy to POST? Although I only tested XT, AT and Compaq Deskpro 386 (8088, 80286 and 80386 base platforms respectively). If the 80286 isn't running within the correct speed range, it will fail to POST and …

Re: MartyPC

Posted on 2024-05-15, 06:13

in PC Emulation
I think the main problems are 1) the whole protected mode shenanigans (though you could just forego on that) and 2) that there isn't a single standard 286 like the 8088 was. There's countless manufacturers and clock speeds (6 MHz up to 25MHz), so there's not one single target.

Re: MartyPC

Posted on 2024-04-20, 20:04

in PC Emulation
Nice! Can't wait for the Tandy sound to work, so I can port some SAA1099 stuff to Tandy. But having the gfx is also quite nice, in the future I'll try to port Rick Dangerous 2 (which never got a proper Tandy mode, unlike RD1, even though there are traces of it in the EXE) to Tandy. I can't recall …

Re: IBM PS/1 Audio card support in PicoGUS?

Posted on 2024-04-17, 14:24

in PC Emulation
As Wikipedia writes, "The Sound Blaster Pro cards are basically 8-bit ISA cards, they use only the lower 8 data bits of the ISA bus. While at first glance it appears to be a 16-bit ISA card, it does not have 'fingers' for data transfer on the higher "AT" portion of the bus connector. It uses the 16- …

Re: IBM PS/1 Audio card support in PicoGUS?

Posted on 2024-04-16, 15:50

in PC Emulation
Well, they're 16-bit cards, and the PicoGUS is 8-bit. Come to think of it, that would also prohibit proper AWE emulation. Not sure why the didn't opt for a 16-bit ISA card, perhaps it's the limit to the number of the RP2040's GPIO pins.

Re: IBM PS/1 Audio card support in PicoGUS?

Posted on 2024-04-16, 15:43

in PC Emulation
Not sure if AWE 32/64 support is doable. Perhaps 32, but recall that the "64" was just 32 + the other 32 in the Windows driver, so for DOS games it's useless. I think the feature set of AWE 32 already exceeded that of the GUS, but it supports both wavetable and OPL3, and I don't think a RP2040 is …

Re: MartyPC

Posted on 2024-01-26, 21:06

in PC Emulation
Another question for the long run: is it possible to configure GLaBIOS somehow to skip the RAM check. I reboot MartyPC quit often, and waiting for the RAM check is boring 😀.

Re: MartyPC

Posted on 2024-01-02, 11:17

in PC Emulation
I hope I'm allowed to attach an EXE file, let's see... (Note the code is a bit Q&D, but the loop setting the colour should be fairly optimal.)

Re: MartyPC

Posted on 2024-01-01, 14:12

in PC Emulation
Ok, I've finally managed to create a working example of both changing the colour (in 640 mode) mid-frame, and switching to 320 mode. One thing that I notice is that MartyPC, as opposed to a my NuXT with ATi Small Wonder, seems to apply changes per 8 lines or thereabouts, at least the jitter I get …

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