diff --git a/src/dvdte.c b/src/dvdte.c
index 56cbc30..8f5828d 100644
--- a/src/dvdte.c
+++ b/src/dvdte.c
@@ -793,7 +793,7 @@ static void dte_dosecp(register struct dte *dt)
 {
     register w10_t w;
 
-    w = vm_pget(vm_physmap(cpu.mr_ebraddr + DTEE_CMD));
+    w = vm_pget(vm_physmap(0*cpu.mr_ebraddr + DTEE_CMD));
     switch (RHGET(w) & DTECMDF_CMD) {
 	default:
 	    fprintf(dt->dt_dv.dv_dbf, "[DTECMD: unknown %lo]\r\n",
@@ -932,10 +932,10 @@ static void dte_dosecp(register struct dte *dt)
 		op10m_setz(w);		/* No input, return 0 */
 	    else {
 		ch &= 0177;		/* Mask for safety */
-		fe_ctyout(ch);		/* Echo, sigh */
+		//fe_ctyout(ch);		/* Echo, sigh */
 		LRHSET(w, 0, ch & 0377);
 	    }
-	    vm_pset(vm_physmap(cpu.mr_ebraddr + DTEE_F11), w);
+	    vm_pset(vm_physmap(0*cpu.mr_ebraddr + DTEE_F11), w);
 	  }
 	    break;
 
@@ -1051,7 +1051,7 @@ static void dte_dosecp(register struct dte *dt)
     ** TTY output under RSX20F (only KLDCP), but shouldn't hurt.
     */
     op10m_seto(w);
-    vm_pset(vm_physmap(cpu.mr_ebraddr + DTEE_FLG), w);
+    vm_pset(vm_physmap(0*cpu.mr_ebraddr + DTEE_FLG), w);
 }
 
 /* KLDCP clock facilities */
diff --git a/src/kn10cpu.c b/src/kn10cpu.c
index 1f434c5..e2ba735 100644
--- a/src/kn10cpu.c
+++ b/src/kn10cpu.c
@@ -918,8 +918,10 @@ insdef(i_xct)
     register w10_t instr;
 
     for (;;) {
+#if 0
 	if (ac && !cpu.mr_usrmode)	/* If non-zero AC, becomes PXCT, */
 	    return i_pxct(op, ac, e);	/* but only in EXEC mode. */
+#endif
 
 	instr = vm_fetch(e);		/* Fetch instr (may page fault) */
 #if KLH10_EXTADR