Re: Pulling my hair out with EGA programming.

Posted on 2023-05-28, 11:01

by

by llm

in Marvin \ Video

in Marvin \ Video

Lameguy64 wrote a small (Watcom C) program to test out EGA stuff, accessing 0xA000:0 directly like you want http://lameguy64.net/?page=dosstuff http://lameguy64.net/snippets/EGATEST.C compiled for me with: https://github.com/open-watcom/open-watcom-v2 without a problem

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Re: How will this affect DOSBox development?

Posted on 2023-05-21, 11:43

by

by llm

in PC Emulation

in PC Emulation

sliderider wrote on 2023-05-21, 07:06: or am I assessing this incorrectly? dosbox does not rely on any hardware features - its a full blown software-emulation of the old hardware, so recompiling of dosbox itself would be enough

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Re: DOSBox debugger

Posted on 2023-05-04, 06:42

by

by llm

in DOSBox Development

in DOSBox Development

i also always got trouble easily finding the output files - so i just added a fixed path to all my needed output files memdump, cpulog etc. - maybe also a solution for you or a way to check if the file isn't generated at all (for whatever reason)

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Re: MT-32 Editor- a new timbre editor and patch librarian for 64-bit Windows

Posted on 2023-04-08, 18:15

by

by llm

in MT-32 General

in MT-32 General

...I wonder how hard it would be to port it to other operating system e.g. with Mono. Microsoft supports Net 6 under serveral non Microsoft operating systems (Linux, MacOs) - im using dot net core 6 for a commercial application under Linux https://learn.microsoft.com/en-us/dotnet/core/install/ so …

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Re: DOSBox debugger

Posted on 2023-03-15, 12:20

by

by llm

in DOSBox Development

in DOSBox Development

thanks for the bochs link im currently get it more or less working with dosbox source changes - needed to use the different load segments for with/without dosbox debugger

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Re: DOSBox debugger

Posted on 2023-03-14, 20:16

by

by llm

in DOSBox Development

in DOSBox Development

How to find data reading code with the dosbox debugger? i've got a 16bit real mode DOS game that loads some level data always at the same position (4A9B:4CC) and i try to find out what part of the code is using the data to decompress im building dosbox from source with heavy-debug mode and im able …

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Re: Breakpoint on DOS Program Start

Posted on 2023-03-05, 08:26

by

by llm

in PC Emulation

in PC Emulation

Write your own .com that calls int21.4b with al=1 to load the program to be debugged, then jump to the new ip with the trap flag set (or some other method to notify your emulator to break). jmarsh idea is the best i think - you can't activate a debugger by just hooking some interrupts because …

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Re: Breakpoint on DOS Program Start

Posted on 2023-03-03, 07:04

by

by llm

in PC Emulation

in PC Emulation

its not clear what you are trying to reach? debugging of DOS exe or com programs can be done using: -(very archaic) using the debug command from a real MS DOS: https://en.wikipedia.org/wiki/Debug_(command) -using the dosbox internal debugger (much better then the real DOS debugger): https://www. …

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Re: Ml.exe masm.exe

Posted on 2023-03-03, 06:51

by

by llm

in DOS

in DOS

different question: why do you want to develop directly under DOS? its much easier to use dosbox + cross-assembling with MASM or better UASM (MASM compatible but better error messages) or NASM on Win/Linux x64 - im doing all my DOS programs that way

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Re: Tiny Vortex86-based DOS gaming PC - weeCee

Posted on 2023-01-19, 14:42

by

by llm

in Marvin \ System Specs

in Marvin \ System Specs

Duffman wrote on 2023-01-19, 14:35: I'd say it's still possible, but I'm sure some code will need to be written to properly add support the Vortex86DX. did you think ICOP changed the AMIBIOS8 for the Vortex86DX?

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Re: Tiny Vortex86-based DOS gaming PC - weeCee

Posted on 2023-01-19, 13:53

by

by llm

in Marvin \ System Specs

in Marvin \ System Specs

Paul_V wrote on 2023-01-19, 12:30: DX\MX\DX2\DX3 - may depend on board manufacturer. DMP\ICOP use AMIBIOS8. sad, so its not possible to check if Seabios works better/different - there seem to be no option to switch the BIOS

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Re: Tiny Vortex86-based DOS gaming PC - weeCee

Posted on 2023-01-19, 12:03

by

by llm

in Marvin \ System Specs

in Marvin \ System Specs

I think it's a BIOS issue so I'm hopping we'll get a BIOS fix from ICOP. is the ICOP BIOS based on the Seabios code? do they share the source code (i think they need if its Seabios due to licence stuff) the "TinyLlama (Vortex86EX SBC)" project uses its own Seabios build (but can also use the …

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Re: Tiny Vortex86-based DOS gaming PC - weeCee

Posted on 2023-01-19, 08:09

by

by llm

in Marvin \ System Specs

in Marvin \ System Specs

Duffman wrote on 2023-01-15, 10:05: I've been using IDA disassembler to modify the code inside ESDI_506.PDR […] Show full quote I've been using IDA disassembler to modify the code inside ESDI_506.PDR But every time I go to test it, I get a Windows Protection Error. Does anyone know why this happens …

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Re: Tiny Vortex86-based DOS gaming PC - weeCee

Posted on 2023-01-19, 08:05

by

by llm

in Marvin \ System Specs

in Marvin \ System Specs

i've found an interesting articel about problems with ESDI_506.PDR and other drivers: https://www.os2museum.com/wp/those-win9x-crashes-on-fast-machines/ talking about problems due to higher loop performance this project seem to got fixes for that: https://github.com/JHRobotics/patcher9x but i don't …

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Re: does this code change the 16 color EGA/VGA palett, how is the color defined?

Posted on 2022-12-03, 07:44

by

by llm

in Marvin \ Video

in Marvin \ Video

thanks you all for the information

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Re: does this code change the 16 color EGA/VGA palett, how is the color defined?

Posted on 2022-12-02, 15:32

by

by llm

in Marvin \ Video

in Marvin \ Video

so the 0x3C0 port is the EGA version of port 0x3c8/0x3c9 in VGA its EGA palett modification code thanks for the info

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does this code change the 16 color EGA/VGA palett, how is the color defined?

Posted on 2022-12-02, 10:42

by

by llm

in Marvin \ Video

in Marvin \ Video

this code is part of a EGA/VGA 320x200x16 color DOS game reverse engineering project - i have no real knowledge about legacy video code stuff except the easy peasy Mode 13h with 256 colors per pixel-byte does that code change the internal EGA/VGA palett? // bytes comming from a game picture file std …

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Re: Sound Driver Pack

Posted on 2022-08-15, 05:24

by

by llm

in DOSBox Games/Apps

in DOSBox Games/Apps

I assume you want to switch between versions, for testing purposes: Change the path eg: SET SOUND=C:\DOS\CT-VOICE\2.12, but some games do not use or respect the SOUND path. Overwrite CT-VOICE.DRV with the version you want to test, which always works. Write a loader to intercept the CT-VOICE.DRV …

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Re: List of Flat-Shaded 3D Polygon Games

Posted on 2022-08-01, 05:43

by

by llm

in Milliways

in Milliways

Kreshna Aryaguna Nurzaman wrote on 2022-08-01, 05:19: Didn't see this on the list though. link?

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Re: List of Flat-Shaded 3D Polygon Games

Posted on 2022-07-31, 11:06

by

by llm

in Milliways

in Milliways

even if not for dos: https://why485.itch.io/vector-fury https://store.steampowered.com/app/1347550/Ti … y_Combat_Arena/ https://why485.itch.io/tiny-x-wing

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