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- (*
- ERIC MILLER
-
- > Let's suppose that I used VGA256.BGI. I change it to VGA256.OBJ. And in
- > my program, I type the following: {$L VGA256.OBJ}
-
- Well, you can't lin VGA256.BGI into the program that way; for some
- reason, if it wasn't included in TP6 it won't register. You have
- to use the InstallUserDriver function instead of RegisterBGIDriver.
- Here is a program that get's into VGA256 mode that way - but of
- course you must already know how to do it.
- *)
-
- PROGRAM Vg;
-
- Uses
- Graph;
-
- FUNCTION vgaPresent : boolean; assembler;
- asm
- mov ah,$F
- int $10
- mov ax,$1A00
- int $10 {check for VGA/MCGA}
- cmp al,$1A
- jne @ERR {no VGA Bios}
- cmp bl,7
- jb @ERR {is VGA or better?}
- cmp bl,$FF
- jnz @OK
- @ERR:
- xor al,al
- jmp @EXIT
- @OK:
- mov al,1
- @EXIT:
- end;
-
- {$F+}
- FUNCTION DetectVGA256: Integer;
- BEGIN
- IF vgaPresent THEN
- DetectVGA256 := 0
- ELSE
- DetectVGA256 := grError;
- END;
- {$F-}
-
-
- VAR
- VGA256: Integer;
- B: Integer;
-
- BEGIN
- VGA256 := InstallUserDriver('VGA256', @DetectVGA256);
- B := 0;
- InitGraph(VGA256, B, '');
- OutText('In 320x200x256 - press enter');
- Readln;
- CloseGraph;
- END.