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- {─ 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;
- _
- / _
- \_/host