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I've heard that the built-in graphics driver is a VESA driver, but it doesn't seem to work on my Acme SVGA/DeLuxe with on-board VESA BIOS Extensions.

With some SVGAs, the built-in VESA driver in djgpp 1.12 will work reliably only if you explicitly set the number of colors to 256, like this: 

  set GO32=nc 256
If you want non-default resolution, you can set it too, like this: 
  set GO32=gw 1024 gh 768 nc 256

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