VOGONS


First post, by MrFlibble

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I was trying to play the Virtua Chess demo for DOS, however I keep getting the following error at startup:

vchess_002.png
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vchess_002.png
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I've tried all available machine=svga_ options available plus vgaonly without effect, both in 074-3 and SVN builds. The debugger shows nothing that would point at the cause of the error.

However, the demo runs without trouble in DOSBox-X.

The game is listed as "supported" in the DOSBox compatibility database, although another user reported what appears to be the same error back in 2005.

DOS Games Archive | Free open source games | RGB Classic Games

Reply 1 of 2, by ripsaw8080

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DOSBox Author

The game has a test that expects raster ops to work in text mode, and while they technically should work in all modes, AFAIK they're only really used in graphics mode. Official DOSBox does not implement raster ops in text mode, presumably for performance reasons, so that may not change just to support this game's unusual test.

The attached TSR program will bypass the shareware version's test; simply run it in DOSBox before running the game. I've made similar TSRs for the commerical and pro versions as well, as they use a similar (but not exactly the same) test.

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