--- np2/io/crtc.c	2004/03/19 00:30:01	1.6
+++ np2/io/crtc.c	2005/02/16 09:31:55	1.7
@@ -22,8 +22,8 @@ static void IOOUTCALL crtc_o7c(UINT port
 	if (grcg.chip) {
 		grcg.modereg = (UINT8)dat;
 		grcg.counter = 0;
-		vramop.operate &= VOP_GRCGMASK;
-		vramop.operate |= ((dat & 0xc0) >> 4);
+		vramop.operate &= ~(3 << VOPBIT_GRCG);
+		vramop.operate |= ((dat & 0xc0) >> (6 - VOPBIT_GRCG));
 		if (grcg.chip >= 2) {
 			grcg.gdcwithgrcg = (dat >> 4) & 0x0c;
 		}