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Re: DOSBox-X branch

Posted on 2021-04-08, 16:17

I haven't seen any Windows 3.x games that use the COLOR_CMP feature, at least not yet. Related to DOSBox's emulation of S3 hardware acceleration, in various Win3 dialogs an "Unhandled draw command 3" log message occurs, which according to the Trio 64 spec is "poly fill solid". The absence of …

Re: DOSBox-X branch

Posted on 2021-04-08, 07:00

I just made a commit to DOSBox-X that adds COLOR_CMP to S3 XGA emulation. I'm not sure if anything in Windows 3.1 or DOS uses it, but it helps Windows 95 DirectX games do their color key based 256-color transparency BitBlts. Think DOSBox SVN could use it? https://github.com/joncampbell123/dosbox-x/ …

Re: DOSBox-X branch

Posted on 2021-03-24, 06:32

A solution for Mickey's Space Adventure, and similarly afflicted games, with machine=pcjr in official source is to use a LOADFIX -88 command. It allocates the memory below the PCjr's video memory window, forcing the program image to load above the window. I fail to see how that fixes the game. …

Re: DOSBox-X branch

Posted on 2021-03-24, 06:01

when tandy boots, its bios sets it to ALWAYS be -16kb because there are no bios settings, it can never change on bootup, it is always -16kb from top of real memory. According to the BIOS code, it seems that 16 kB is NOT subtracted if an EGA or VGA card is installed, which does make some sense. …

Re: DOSBox-X branch

Posted on 2021-03-24, 00:38

as someone who has a 1000sx and wrote a util to manage the graphics memory, only the word at 0x413 changes. any game that assumes > 16kb will destroy any MCB headers. you need to run a util to set it to 32kb or more like first thing (and they work by modifying the MCB chain headers). INT 10h will …

Re: DOSBox-X branch

Posted on 2021-03-23, 15:16

I have a question about Tandy, PCjr, and INT 12h and the "BIOS memory size" in the BIOS data area. This is a discussion on DOSBox-X about whether Tandy mode should report 608KB (32KB off the top) of 624KB (16KB off the top as SVN does now). Apparently some games require the 16KB off the top to work …

Re: DOSBox-X branch

Posted on 2021-02-01, 07:57

Wengier, what about the Glide passthrough requires the private area? The reason DOSBox-X turns it off on guest boot by default, is because that private area is often used by the DOS kernel for it's internal structures and these structures have no meaning once a guest OS is started. The option is …

Re: DOSBox-X branch

Posted on 2021-01-26, 08:42

DOSBox-X's 3Dfx emulation is the code as it existed in DOSBox SVN, with updates pulled from the ykhwong Daum branch sometime 2015, and then some updates to try to cooperate with OpenGL output and the SDL1 menu drawing code.

Re: DOSBox-X branch

Posted on 2021-01-07, 16:36

In future releases of DOSBox, could you put SDL2 binaries (SDL1 binaries don´t work in Windows XP) compiled with mingw with debugger enabled? I have to compile myself (using msys32 in Windows XP) because there is no SDL2 version with debugger enabled that works in Windows XP. I would, but I am not …

Re: DOSBox-X branch

Posted on 2020-12-01, 01:35

as it would actually occur on real hardware. Are you sure it would? I believe this is played in real DOS and there's no flicker: https://youtu.be/BG1mbhc0Cv0 The video capture also seems to have a fairly choppy frame rate that generally hides the flickering. But notice at 4:25 that not even a low …

Re: DOSBox-X branch

Posted on 2020-12-01, 01:13

The evidence weighs toward that it is a real DOS issue, too, at least with a similar video card type. Does it mean it can't be fixed? It means the game has a flickering cursor problem and both SVN and X are emulating the flicker problem as it would actually occur on real hardware. If you like, you …

Re: DOSBox-X branch

Posted on 2020-11-30, 20:12

I suspect that's just the game's management of the cursor: it needs to hide and show the cursor because the fan is animating. Maybe? I don't think that's it, the cursor flickers on static scenes too. If you move the cursor down to the action tabs, it changes to a different looking cursor and this …

Re: DOSBox-X branch

Posted on 2020-11-30, 19:21

I suspect that's just the game's management of the cursor: it needs to hide and show the cursor because the fan is animating. Maybe? According to you though, this is a problem in both DOSBox SVN and DOSBox-X (and probably any fork), which means it may just be accurate emulation of the game's …

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