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Re: VFX1 emulation

the DOSBox scaler code is hideously complicated and totally undocumented. I don't see why you need to move on to the scaler level, that's completely independent from the graphics hardware emulation and rendering. If you want to output the image data to some external device, grab the frame buffer …

Re: Ping-pong virus emulation

I thought that correctly emulating this would prove that dosbox is coming close to the real thing. dosbox aims at 386+ emulation, so this is out of scope. But should be no problem to hack the mov cs,ax into the normal core if you can compile dosbox from sources and have some use this.

Re: VFX1 emulation

VGA_SetupDrawing() chooses the drawing handler (if any), so check what the respective game uses. Most common case should be VGA_Draw_Linear_Line(), so the following refers to that function. vga.draw.linear_base is the base of the graphics memory, see VGA_Draw_Chain_Line() for some nontrivial example …

Re: GUS Propatches

in DOS
Well then fire up some debugger and see why int21/3d or similar fail. As Qbix already noted the runtime error signals failed access to some file be it in the original directory or in some directory it wants to update, maybe even config.sys or whatever.

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