diff --git a/B5500/b5500_cpu.c b/B5500/b5500_cpu.c
index 2cd1307..418b0e9 100644
--- a/B5500/b5500_cpu.c
+++ b/B5500/b5500_cpu.c
@@ -101,7 +101,7 @@
 #define UNIT_MSIZE      (7 << UNIT_V_MSIZE)
 #define MEMAMOUNT(x)    (x << UNIT_V_MSIZE)
 
-#define TMR_RTC         1
+#define TMR_RTC         0
 
 #define HIST_MAX        5000
 #define HIST_MIN        64
diff --git a/B5500/b5500_defs.h b/B5500/b5500_defs.h
index 8c53544..9f11639 100644
--- a/B5500/b5500_defs.h
+++ b/B5500/b5500_defs.h
@@ -52,18 +52,13 @@ extern uint8            loading;                        /* System booting flag *
 
 /* Debuging controls */
 #define DEBUG_CHAN      0x0000001       /* Show channel fetchs */
-#define DEBUG_TRAP      0x0000002       /* Show CPU Traps */
 #define DEBUG_CMD       0x0000004       /* Show device commands */
 #define DEBUG_DATA      0x0000008       /* Show data transfers */
 #define DEBUG_DETAIL    0x0000010       /* Show details */
 #define DEBUG_EXP       0x0000020       /* Show error conditions */
-#define DEBUG_SNS       0x0000040       /* Shows sense data for 7909 devs */
-#define DEBUG_CTSS      0x0000080       /* Shows CTSS specail instructions */
-#define DEBUG_PROT      0x0000100       /* Protection traps */
 
 extern DEBTAB dev_debug[];
 
-
 /* Returns from device commands */
 #define SCPE_BUSY       (1)     /* Device is active */
 #define SCPE_NODEV      (2)     /* No device exists */
diff --git a/B5500/b5500_io.c b/B5500/b5500_io.c
index 1c27829..ad42dad 100644
--- a/B5500/b5500_io.c
+++ b/B5500/b5500_io.c
@@ -142,7 +142,6 @@ chan_advance(int chan) {
     uint16      addr = (uint16)(D[chan] & CORE);
 
     if (D[chan] & DEV_WCFLG) {
-    sim_debug(DEBUG_DETAIL, &chan_dev, "advance (%016llo %o)\n", D[chan], chan);   
         uint16   wc = WC(D[chan]);
         if (wc == 0) {
             status[chan] |= EOR;