diff --git a/VAX/vax_cpu.c b/VAX/vax_cpu.c
index 82abeddb..c08ba64c 100644
--- a/VAX/vax_cpu.c
+++ b/VAX/vax_cpu.c
@@ -432,7 +432,7 @@ MTAB cpu_mod[] = {
     { MTAB_XTD|MTAB_VDV, 0, "IDLE", "IDLE={VMS|ULTRIX|ULTRIX-1.X|ULTRIXOLD|NETBSD|NETBSDOLD|OPENBSD|OPENBSDOLD|QUASIJARUS|32V|ELN}{:n}", &cpu_set_idle, &cpu_show_idle, NULL, "Display idle detection mode" },
     { MTAB_XTD|MTAB_VDV, 0, NULL, "NOIDLE", &sim_clr_idle, NULL, NULL,  "Disables idle detection" },
     MEM_MODIFIERS,   /* Model specific memory modifiers from vaxXXX_defs.h */
-    { MTAB_XTD|MTAB_VDV|MTAB_NMO|MTAB_SHP, 0, "HISTORY", "HISTORY",
+    { MTAB_XTD|MTAB_VDV|MTAB_NMO|MTAB_SHP|MTAB_NC, 0, "HISTORY", "HISTORY",
       &cpu_set_hist, &cpu_show_hist, NULL, "Displays instruction history" },
     { MTAB_XTD|MTAB_VDV|MTAB_NMO|MTAB_SHP, 0, "VIRTUAL", NULL,
       NULL, &cpu_show_virt, NULL, "show translation for address arg in KESU mode" },
@@ -1591,7 +1591,8 @@ for ( ;; ) {
         break;
 
     case CLRQ:
-        WRITE_Q (0, 0);                                 /* store result */
+        r = rh = 0;
+        WRITE_Q (r, rh);                                /* store result */
         CC_ZZ1P;                                        /* set cc's */
         break;