--- work.i386/gxemul-0.4.7.2/src/devices/dev_mc146818.c.orig	2009-06-22 01:03:48.000000000 +0900
+++ work.i386/gxemul-0.4.7.2/src/devices/dev_mc146818.c	2010-03-21 00:12:02.000000000 +0900
@@ -211,8 +211,9 @@
 		 */
 		d->reg[4 * MC_YEAR] += 80;
 		break;
+	case MC146818_ARC_JAZZ:
 	case MC146818_ARC_NEC:
-		d->reg[4 * MC_YEAR] += (0x18 - 104);
+		d->reg[4 * MC_YEAR] -= 80;
 		break;
 	case MC146818_CATS:
 		d->reg[4 * MC_YEAR] %= 100;