Re: USB 2.0 keyboard not recognized in USB 1.x ports. - Solutions?

Posted on 2024-05-11, 03:19

by

by jmarsh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It looks like it's missing a boot protocol interface, which is the simplified protocol designed specifically for BIOSes to be able to use keyboards and mice.

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Re: Xbox 360 Marketplace closing

Posted on 2024-05-08, 06:54

by

by jmarsh

in Milliways

in Milliways

As someone who has just recently gotten into Xbox 360 gaming, this sucks. Worst of all, it may also drive up the prices of physical games, which are dirt cheap at this time. This is inevitable for every console. The best time to build your collection is after the next generation comes out and the …

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Re: Writing a TSR that stores/restores the video screen (C with inline Asm)

Posted on 2024-05-07, 06:43

by

by jmarsh

in DOSBox General

in DOSBox General

I understand, but what happens when you make sure DS is correct and then do LDS SI, (DS:)[variable]? Will it know where the variable is before it changes the DS or will it first change DS so it no longer has the correct segment of the variable, hence it loads some nonsesical adress from the wrong …

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Re: Clever / hacky usage of the ISA modems?

Posted on 2024-05-07, 06:34

by

by jmarsh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If you wanted to do that sort of stuff you'd probably be after a PCI modem. All the ISA modems I've seen only expose themselves as bog standard serial ports.

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Re: Writing a TSR that stores/restores the video screen (C with inline Asm)

Posted on 2024-05-06, 11:38

by

by jmarsh

in DOSBox General

in DOSBox General

What are you using for a compiler? An ordinary pointer probably won't work with lds/les, it will need to be a far pointer.

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Re: How do I play DOSBox-bundled Windows games on real hardware?

Posted on 2024-05-05, 08:06

by

by jmarsh

in DOSBox Games/Apps

in DOSBox Games/Apps

Lylat1an wrote on 2024-05-05, 00:41: You are correct. It doesn't sound like it. The keen games are each in the base1, base2, etc. directories and the executables are named keen1.exe, keen2.exe etc. Exactly which executables are you trying to run?

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Re: Pentium 60/66 are DOS Only?

Posted on 2024-05-02, 23:18

by

by jmarsh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If you bought a P60 to game on in 1993, and your buddy bought a DX2-66 at the same time, he would have been laughing at you for 2 years right up until Descent came out. Descent didn't use floating point math. It was all integer / fixed point and was "playable" on a 386 (provided you could put up …

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Re: IDE/SD card adapter problems (replacing hard disk)

Posted on 2024-04-28, 22:26

by

by jmarsh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Stop using other machines to partition and format the cards. You need to do it all on the target machine - use auto-detect in the BIOS, boot with a floppy and use fdisk to remove whatever partitions are there and create a new one. Then format it with the /S option to make it bootable.

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Re: Please help for pinout of onboard vga connector - Soyo SY-5TS0 / SY-5TS2 / SY-5TS5

Posted on 2024-04-25, 22:58

by

by jmarsh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Anybody out there who has knowledge about what is needed to the circuit between vga connector and the GPU? Maybe parts for decoupling or coupling to ground of the connector pins? They should be connected directly to the GPU with 75 ohm resistors to GND for the R, G, B lines. Not sure what impedance …

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Re: 386 board CMOS problem

Posted on 2024-04-25, 14:45

by

by jmarsh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The DS1287 has its own internal battery (and crystal) so the CR2032 won't be doing anything. The symptom of the RTC losing all its settings except for the calender (date/time) would indicate the rclr pin (21) isn't being held high when the RTC is powered.

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Re: Looking for help with analyzing disassembled code->

Posted on 2024-04-22, 14:04

by

by jmarsh

in Milliways

in Milliways

It handles converting "DOS" filesystem attributes to the values returned in a struct stat, e.g. S_IFDIR, S_IEXEC etc.

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Re: 44 to 40 adapter not working

Posted on 2024-04-22, 08:11

by

by jmarsh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Pin 1 is at the opposite end of the 44-pin connector from the power - judging from the red stripe you've got the IDE cable connected the wrong way around.

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Re: Descent 3 source released under MIT

Posted on 2024-04-17, 04:39

by

by jmarsh

in Release Announcements

in Release Announcements

I don't know if someone's going to go after somebody because somebody wrote a third party method of decoding MVE. Unless Interplay has managed to patent the format they can't. More practically decoders have been included in ffmpeg for literally decades (also ScummVM more recently) without any legal …

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Re: Descent 3 source released under MIT

Posted on 2024-04-17, 01:38

by

by jmarsh

in Release Announcements

in Release Announcements

robertmo3 wrote on 2024-04-16, 19:24: if someone wants to make a remake/remaster than enhancing videos is an option open source means we can provide videos It's not an option to rip off copyright game assets.

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Re: Looking for help with analyzing disassembled code->

Posted on 2024-04-16, 19:16

by

by jmarsh

in Milliways

in Milliways

The purpose of those functions is to shift right/left 32-bit values using 16-bit code. The bit that travels between the upper and lower halves of the 32-bit value gets moved into the carry flag with the shift operation, then inserted into the other half with the rotate.

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Re: Descent 3 source released under MIT

Posted on 2024-04-16, 19:01

by

by jmarsh

in Release Announcements

in Release Announcements

Considering every major hardware vendor supports H264 in hardware that's probably a good thing to turn the videos into. Why are we turning the videos "into" anything? If someone's making a source port it would need to handle the original data files, i.e. it would need to play MVEs. Nobody is going …

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Re: Descent 3 source released under MIT

Posted on 2024-04-16, 13:14

by

by jmarsh

in Release Announcements

in Release Announcements

Not sure what ACM refers to but MVE movies were used in Descent2 and are pretty well understood, e.g. https://wiki.multimedia.cx/index.php/Interplay_MVE . I think there were some additions to ffmpeg a few years ago that added some of the unknown opcodes.

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Re: What tool debugs a miscalculated area of memory in a game program written in C?

Posted on 2024-04-16, 05:47

by

by jmarsh

in Milliways

in Milliways

Your for loop is not exiting when it should due to a typo: Copy code to clipboard 1 2 line 345: for (index=0, index<256; index++) comma after 0 should be a semi-colon.

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Re: Video from 486 Sometimes in Black/White

Posted on 2024-04-15, 13:49

by

by jmarsh

in Marvin \ Video

in Marvin \ Video

(mono/color, there's a detection pin on the VGA connector). There used to be a pin to detect monochrome monitors (pin 12). It was repurposed in later monitors for DDC, turning it into an I2C data pin. Unfortunately not all monitors have internal pull-ups (required for I2C to work properly) and …

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Re: Getting digital/lossless audio with an adapter from Windows 98?

Posted on 2024-04-05, 21:37

by

by jmarsh

in Marvin \ Sound

in Marvin \ Sound

SPDIF is more or less the only transport format for lossless, it was the defacto digital interface (using either RCA/coax connectors or TOSLINK/optical). It's going to be a lot easier to do with a USB adapter, due to being a well defined standard with built-in support included in the OS - you can …

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