diff --git a/PDP10/ka10_cpu.c b/PDP10/ka10_cpu.c
index 6cdffdd..92062b5 100644
--- a/PDP10/ka10_cpu.c
+++ b/PDP10/ka10_cpu.c
@@ -4100,9 +4100,10 @@ return SCPE_OK;
 
 /* Memory size change */
 
-t_stat cpu_set_size (UNIT *uptr, int32 val, CONST char *cptr, void *desc)
+t_stat cpu_set_size (UNIT *uptr, int32 sval, CONST char *cptr, void *desc)
 {
 uint32 i;
+uint32 val = (uint32)sval;
 
 if ((val <= 0) || ((val * 16 * 1024) > MAXMEMSIZE))
     return SCPE_ARG;
diff --git a/PDP10/ka10_cty.c b/PDP10/ka10_cty.c
index 5b3f0c2..d1b0f8b 100644
--- a/PDP10/ka10_cty.c
+++ b/PDP10/ka10_cty.c
@@ -162,7 +162,8 @@ t_stat cty_reset (DEVICE *dptr)
     cty_unit[0].u3 &= ~(TEL_RDY | TEL_BSY);
     cty_unit[1].u3 &= ~(KEY_RDY | KEY_BSY);
     clr_interrupt(CTY_DEVNUM);
-    sim_activate (&cty_unit[1], KBD_WAIT (cty_unit[1].wait, tmxr_poll));
+    sim_clock_coschedule (&cty_unit[1], tmxr_poll);
+
     return SCPE_OK;
 }
 
diff --git a/PDP10/ka10_dt.c b/PDP10/ka10_dt.c
index 2f32cf1..865e755 100644
--- a/PDP10/ka10_dt.c
+++ b/PDP10/ka10_dt.c
@@ -1036,7 +1036,7 @@ dt_boot(int32 unit_num, DEVICE * dptr)
 
 t_stat dt_reset (DEVICE *dptr)
 {
-    dtsa = dtsb = 0;                                    /* clear status */
+    dtsb = dtsa = 0;                                    /* clear status */
     clr_interrupt(DT_DEVNUM);
     clr_interrupt(DT_DEVNUM|4);
     return SCPE_OK;
diff --git a/PDP10/ka10_mt.c b/PDP10/ka10_mt.c
index 16ea501..77f516f 100644
--- a/PDP10/ka10_mt.c
+++ b/PDP10/ka10_mt.c
@@ -830,7 +830,7 @@ mt_boot(int32 unit_num, DEVICE * dptr)
         M[addr] = mt_df10.buf;
 
     /* If not at end of record and TMA continue record read */
-    if ((uptr->u6 < uptr->hwmark) && (dptr->flags & MTDF_TYPEB) == 0) {
+    if (((uint32)uptr->u6 < uptr->hwmark) && (dptr->flags & MTDF_TYPEB) == 0) {
         uptr->u3 |= MT_MOTION|MT_BUSY;
         uptr->u3 &= ~(MT_BRFUL|MT_BUFFUL);
         sim_activate(uptr, 300);
diff --git a/PDP10/ka10_rs.c b/PDP10/ka10_rs.c
index ff0fc2e..ca6331b 100644
--- a/PDP10/ka10_rs.c
+++ b/PDP10/ka10_rs.c
@@ -600,7 +600,7 @@ t_stat rs_svc (UNIT *uptr)
     int          unit;
     DEVICE      *dptr;
     struct df10 *df;
-    int          diff, da;
+    int          da;
     t_stat       r;
 
     /* Find dptr, and df10 */
diff --git a/PDP10/ka10_tu.c b/PDP10/ka10_tu.c
index 9b62aa8..043c713 100644
--- a/PDP10/ka10_tu.c
+++ b/PDP10/ka10_tu.c
@@ -1027,7 +1027,6 @@ tu_boot(int32 unit_num, DEVICE * dptr)
     t_mtrlnt            reclen;
     t_stat              r;
     uint32              addr;
-    uint32              ptr;
     int                 wc;
 
     if ((uptr->flags & UNIT_ATT) == 0)