It's in the octet which the adress is 0x40:0xE5.
Here's two functions :
// This function return the current level
// of the contrast
// Function extract from DB-Lib.h by Swifter.
unsigned char get_contrast()
{
asm{
mov ax,0x40
mov es,ax
mov al,es:0xE5
sub al,0x12
shr al,0x1
}
return _AL;
}
// Initialize the contrast
// But stay on your guards : indeed, it could appears some compatibility troubles.
// Between the g100 and the g100+
// This function is faster than the old one cause it calls the 7Ch interruption just one time.
// Function extract from DB-Lib.h by Swifter.
void contrast(unsigned char niv)
{
asm{
mov ax,0x40
mov es,ax
mov al,niv
shl al,0x1
add ax,0x2210
mov es:0xE5,al
xor bl,bl
int 0x7C
}
}that's all ;p
