diff --git a/PDP10/ka10_cpu.c b/PDP10/ka10_cpu.c
index 59e402a..af268ec 100644
--- a/PDP10/ka10_cpu.c
+++ b/PDP10/ka10_cpu.c
@@ -794,7 +794,7 @@ int check_irq_level() {
  * Recover from held interrupt.
  */
 void restore_pi_hold() {
-     int i, lvl;
+     int lvl;
 
      if (!pi_enable)
         return;
@@ -1442,7 +1442,7 @@ int its_load_tlb(uint32 reg, int page, uint32 *tlb) {
     if ((page & 1) == 0)
         data >>= 18;
     data &= RMASK;
-    *tlb = data;
+    *tlb = (uint32)data;
     pag_reload = ((pag_reload + 1) & 017);
     return 0;
 }
@@ -1460,7 +1460,7 @@ int page_lookup(int addr, int flag, int *loc, int wr, int cur_context, int fetch
         int      page = (RMASK & addr) >> 10;
         int      acc;
         int      uf = (FLAGS & USER) != 0;
-        int      ofd = fault_data;
+        int      ofd = (int)fault_data;
 
         /* If paging is not enabled, address is direct */
         if (!page_enable) {
@@ -2771,7 +2771,7 @@ dpnorm:
                       dbr3 = ((0377 << 18) | RMASK) & MB;
                       AB = (AB + 1) & RMASK;
                       MB = M[AB];                /* WD 7 */
-                      ac_stack = MB;
+                      ac_stack = (uint32)MB;
                       page_enable = 1;
                   }
                   /* AC & 2 = Clear TLB */
@@ -3122,7 +3122,6 @@ ldb_ptr:
               }
 fnorm:
               if (AR != 0) {
-fxnorm:
                   if ((AR & FPNMASK) != 0) { SC += 1;  AR >>= 1; }
                   if (((SC & 0400) != 0) ^ ((SC & 0200) != 0))
                       fxu_hold_set = 1;
diff --git a/PDP10/ka10_dc.c b/PDP10/ka10_dc.c
index 8f33c4c..df48145 100644
--- a/PDP10/ka10_dc.c
+++ b/PDP10/ka10_dc.c
@@ -315,7 +315,7 @@ int32 ln;
     tmxr_poll_rx(&dc_desc);
     for (ln = 0; ln < dc_desc.lines; ln++) {
        /* Check if buffer empty */
-       if (dc_ldsc[ln].xmte && (dc_l_status & (1 << ln)) != 0) {
+       if (dc_ldsc[ln].xmte && ((dc_l_status & (1ll << ln)) != 0)) {
            tx_enable |= 1 << ln;
        }
 
diff --git a/PDP10/ka10_defs.h b/PDP10/ka10_defs.h
index 57ca618..4d22eda 100644
--- a/PDP10/ka10_defs.h
+++ b/PDP10/ka10_defs.h
@@ -213,6 +213,9 @@ extern DEBTAB crd_debug[];
 #define EXJSYS  000040        /* 002000 */
 #endif
 #ifdef ITS
+#ifdef PURE
+#undef PURE
+#endif
 #define PURE    000040        /* 002000 */
 #define ONEP    000010        /* 000400 */
 #endif
diff --git a/PDP10/ka10_mt.c b/PDP10/ka10_mt.c
index c3a89e5..de57b58 100644
--- a/PDP10/ka10_mt.c
+++ b/PDP10/ka10_mt.c
@@ -610,7 +610,7 @@ t_stat mt_srv(UNIT * uptr)
             }
             uptr->BPOS++;
             uptr->CPOS++;
-            if ((uptr->BPOS + cc_max) >= uptr->hwmark)
+            if ((uint32)(uptr->BPOS + cc_max) >= uptr->hwmark)
                 uptr->CNTRL |= MT_LASTWD;
             status &= ~CHAR_COUNT;
             status |= (uint64)(uptr->CPOS) << 18;
diff --git a/PDP10/ka10_mty.c b/PDP10/ka10_mty.c
index 47b77e0..ddc4bd9 100644
--- a/PDP10/ka10_mty.c
+++ b/PDP10/ka10_mty.c
@@ -169,7 +169,6 @@ static t_stat mty_svc (UNIT *uptr)
 {
     static int scan = 0;
     int i;
-    int32 done;
 
     /* High speed device, poll every 0.1 ms. */
     sim_activate_after (uptr, 100);
@@ -221,8 +220,6 @@ static t_stat mty_svc (UNIT *uptr)
 
 static t_stat mty_reset (DEVICE *dptr)
 {
-    int i;
-
     sim_debug(DEBUG_CMD, &mty_dev, "Reset\n");
     if (mty_unit->flags & UNIT_ATT)
         sim_activate (mty_unit, tmxr_poll);
diff --git a/PDP10/ka10_rp.c b/PDP10/ka10_rp.c
index 0e4e859..4e657eb 100644
--- a/PDP10/ka10_rp.c
+++ b/PDP10/ka10_rp.c
@@ -539,7 +539,7 @@ t_stat rp_devio(uint32 dev, uint64 *data) {
         } else if ((rp_reg[ctlr] & 040) == 0) {
               int parity;
               *data = (t_uint64)(rp_read(ctlr, rp_drive[ctlr], rp_reg[ctlr]) & 0177777);
-              parity = (*data >> 8) ^ *data;
+              parity = (int)((*data >> 8) ^ *data);
               parity = (parity >> 4) ^ parity;
               parity = (parity >> 2) ^ parity;
               parity = ((parity >> 1) ^ parity) & 1;
diff --git a/PDP10/ka10_rs.c b/PDP10/ka10_rs.c
index 26c7aa6..24fe795 100644
--- a/PDP10/ka10_rs.c
+++ b/PDP10/ka10_rs.c
@@ -382,7 +382,7 @@ t_stat rs_devio(uint32 dev, uint64 *data) {
                int parity;
 
                *data = (t_uint64)(rs_read(ctlr, rs_drive[ctlr], rs_reg[ctlr]) & 0177777);
-               parity = (*data >> 8) ^ *data;
+               parity = (int)((*data >> 8) ^ *data);
                parity = (parity >> 4) ^ parity;
                parity = (parity >> 2) ^ parity;
                parity = ((parity >> 1) ^ parity) & 1;
diff --git a/PDP10/ka10_tk10.c b/PDP10/ka10_tk10.c
index b8c42d4..bddc377 100644
--- a/PDP10/ka10_tk10.c
+++ b/PDP10/ka10_tk10.c
@@ -183,7 +183,6 @@ static t_stat tk10_svc (UNIT *uptr)
 {
     static int scan = 0;
     int i;
-    int32 done;
 
     sim_activate_after (uptr, 1000);
 
@@ -244,8 +243,6 @@ static t_stat tk10_svc (UNIT *uptr)
 
 static t_stat tk10_reset (DEVICE *dptr)
 {
-    int i;
-
     sim_debug(DEBUG_CMD, &tk10_dev, "Reset\n");
     if (tk10_unit->flags & UNIT_ATT)
         sim_activate (tk10_unit, tmxr_poll);