diff --git a/PDP10/ka10_auxcpu.c b/PDP10/ka10_auxcpu.c
index 01f200e..74dc64e 100644
--- a/PDP10/ka10_auxcpu.c
+++ b/PDP10/ka10_auxcpu.c
@@ -345,7 +345,6 @@ static int auxcpu_interrupt (void)
 
 t_stat auxcpu_devio(uint32 dev, uint64 *data)
 {
-    DEVICE *dptr = &auxcpu_dev;
     UNIT   *uptr = &auxcpu_unit[0];
 
     switch(dev & 07) {
diff --git a/PDP10/ka10_mty.c b/PDP10/ka10_mty.c
index 0adc225..e5c8b4f 100644
--- a/PDP10/ka10_mty.c
+++ b/PDP10/ka10_mty.c
@@ -100,7 +100,6 @@ DEVICE mty_dev = {
 
 static t_stat mty_devio(uint32 dev, uint64 *data)
 {
-    TMLN *lp;
     int line;
     uint64 word;
 
@@ -133,7 +132,6 @@ static t_stat mty_devio(uint32 dev, uint64 *data)
         word = *data;
         sim_debug(DEBUG_DATAIO, &mty_dev, "DATAO line %d -> %012llo\n",
                   line, word);
-        lp = &mty_ldsc[line];
         mty_output_word[line] = word | MTY_FIRST;
         mty_active_bitmask |= 1 << line;
         sim_activate_abs (&mty_unit[1], 0);
@@ -141,7 +139,6 @@ static t_stat mty_devio(uint32 dev, uint64 *data)
         break;
     case DATAI:
         line = (status & MTY_LINE) >> 12;
-        lp = &mty_ldsc[line];
         *data = mty_input_character;
         sim_debug(DEBUG_DATAIO, &mty_dev, "DATAI line %d -> %012llo\n",
                   line, *data);
diff --git a/PDP10/kx10_cpu.c b/PDP10/kx10_cpu.c
index a8ea32a..eca8e75 100644
--- a/PDP10/kx10_cpu.c
+++ b/PDP10/kx10_cpu.c
@@ -5377,7 +5377,7 @@ dpnorm:
               MQ = CCM(MB) + 1;   /* Low */
               /* High */
 #if KL
-              flag3 = 0;
+              flag1 = flag3 = 0;
               if ((CCM(AR) + ((MQ & SMASK) != 0)) & SMASK) {
                   FLAGS |= CRY1;
                   flag1 = 1;
@@ -8988,7 +8988,7 @@ do_byte_setup(int n, int wr, int *pos, int *sz)
              if (MB & SMASK) {    /* Instruction format IFIW */
                  if (MB & BIT1) { /* Illegal index word */
                      fault_data = 024LL << 30 | (((FLAGS & USER) != 0)?SMASK:0) |
-                                  (temp & RMASK) | ((uint64)sect << 18);
+                                  AB | ((uint64)sect << 18);
                      page_fault = 1;
                      return 1;
                  }
diff --git a/PDP10/pdp6_slave.c b/PDP10/pdp6_slave.c
index acd73db..ebbd8b6 100644
--- a/PDP10/pdp6_slave.c
+++ b/PDP10/pdp6_slave.c
@@ -291,7 +291,6 @@ static const char *slave_description (DEVICE *dptr)
 
 t_stat slave_devio(uint32 dev, uint64 *data)
 {
-    DEVICE *dptr = &slave_dev;
     UNIT   *uptr = &slave_unit[0];
 
     switch(dev & 03) {