--- np2/io/dmac.c	2004/01/05 09:31:25	1.5
+++ np2/io/dmac.c	2004/01/13 05:30:58	1.6
@@ -149,7 +149,7 @@ static void IOOUTCALL dmac_o21(UINT port
 	DMACH	dmach;
 
 	dmach = dmac.dmach + (((port >> 1) + 1) & 3);
-	dmach->adrs.b[DMA32_HIGH + DMA16_LOW] = dat;
+	dmach->adrs.b[DMA32_HIGH + DMA16_LOW] = dat & 0x0f;
 }
 
 static REG8 IOINPCALL dmac_i01(UINT port) {