--- np2/i286c/cpucore.h	2004/03/10 23:01:08	1.16
+++ np2/i286c/cpucore.h	2004/03/25 10:41:13	1.17
@@ -285,6 +285,7 @@ void v30c_step(void);
 						i286core.s.trap = 0;
 #define	CPU_STI			i286core.s.r.w.flag |= I_FLAG;						\
 						i286core.s.trap = (i286core.s.r.w.flag >> 8) & 1;
+#define	CPU_A20EN(en)	CPU_ADRSMASK = (en)?0xfffffff:0x000fffff;
 
 #define	CPU_INITIALIZE				i286c_initialize
 #define	CPU_DEINITIALIZE			i286c_deinitialize