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vgadetct.pas
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Pascal/Delphi Source File
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1993-04-22
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1KB
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36 lines
{─ Fido Pascal Conference ────────────────────────────────────────────── PASCAL ─
Msg : 259 of 534
From : Sean Palmer 1:104/123.0 19 Apr 93 16:29
To : Aaron Marasco
Subj : VGA Detection
────────────────────────────────────────────────────────────────────────────────
AM> I know how to determine the current mode of a card, but how
AM> do a lot of programs determine if a VGA is present in the
AM> first place? I'd really appreciate some code if possible.
AM> Oh, and does anyone know about custom character fonts for
AM> EGA? Is it possible? If so, could someone also pass along
AM> the code for EGA detection? Thanks!
Font-changing is possible, but you seem to have just missed a lot of
font-changing routines on here...
Well, here are routines to detect a VGA and an EGA adapter...}
function EGAInstalled:boolean;assembler;asm
mov ax,$1200; mov bx,$10; mov cx,$FFFF; int $10;
inc cx; mov al,cl; or al,ch;
end;
function vgaPresent:boolean;assembler;asm
mov ah,$F; int $10; mov oldMode,al; {save old Gr mode}
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;
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