The built-in routine to set the palette takes 8 milliseconds on my machine;
this is way too slow - it is possible to write the palette entirely during
the vertical blanking period. This code works for DOS:
push ds
mov dx, 0x3D6 // Select XR14
mov al, 0x14
out dx, al
mov dx, 0x3D7 // Enable VSYNC, Retrace, and HSYNC
in al, dx
and al, 0x8F
or al, 0x50
out dx, al
in al, dx
mov dx, 0x3DA // Wait for Vertical retrace
loop0:
in al, dx
and al, 0x08
jz loop0
mov dx, 0x3C8 // Send the palette
mov al, 0
out dx, al
mov cx, 768
lds si, pal
mov dx, 0x3C9
rep outsb
pop ds
I've translated it to:
void setPalette( uchar *thePalette )
{
uchar stat;
outb( 0x3D6, 0x14 ); // Select XR14
stat = inb( 0x3D7 ) & 0x8F; // Enable VSYNC, Retrace, and HSYNC
outb( 0x3D7, stat | 0x50 );
while ( inb( 0x3D7 ) & 0x08 )
continue;
outb( 0x3C8, 0 ); // Send the palette
/* How do I put in the in-line assembly here? */
}
--
_
Kevin D. Quitt [EMAIL PROTECTED]
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