24 lines
1.1 KiB
Text
24 lines
1.1 KiB
Text
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This contains the source for a Borland C++ program that allows you to dump
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the register contents for any BIOS video mode. 'vga.exe' should work with
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any VGA/SVGA adapter. It takes a hexadecimal mode number as argument and
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writes the (VGA) register contents to the console.
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These printout can be used to write a new driver. Please read also 'man 7
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svgalib.et4000' about the tseng3.exe program.
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trap-out.asm / .com is a DOS program which traces all I/O calls made when a
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given video mode is set by the BIOS. It was used for the TVGA driver and should
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be useful for other drivers too, esp. if no documentation is available.
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It spits out a long list of "T DX/I AX/L" strings where T is "I" for IN or
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"O" for OUT, DX/I is the value of DX or the immediate given value for
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ports <256, and AX/L is the value of AX or AL before the call to IN or OUT
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(yeah, the value of AX is pretty worthless before a call to IN, but oh
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well)
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This output is very very easily parsed into a simple C routine that calls
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port_in and port_out many many times, but will set the same mode the BIOS
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did.
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The trap-out program is courtesy of Ryan Rubley <rubleyr@river.it.gvsu.edu>
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