diff --git a/I1620/i1620_sys.c b/I1620/i1620_sys.c
index 40ec70d3..aba91488 100644
--- a/I1620/i1620_sys.c
+++ b/I1620/i1620_sys.c
@@ -390,7 +390,7 @@ if (opcode[i].str == NULL)
 if (I_GETQP (opfl) == I_M_QNP)                          /* Q no print? */
     qmp = 0;
 
-fprintf (of, opcode[i].str);                            /* print opcode */
+fprintf (of, "%s", opcode[i].str);                            /* print opcode */
 if (I_GETPP (opfl) == I_M_PP)                           /* P required? */
     fprint_addr (of, ' ', &val[I_P], I_M_QX);
 else if ((I_GETPP (opfl) == I_M_PCP) && (pmp || qmp))   /* P opt & needed? */
diff --git a/Ibm1130/ibm1130_cr.c b/Ibm1130/ibm1130_cr.c
index c45205a8..6d262da4 100644
--- a/Ibm1130/ibm1130_cr.c
+++ b/Ibm1130/ibm1130_cr.c
@@ -944,7 +944,7 @@ t_stat load_cr_boot (int drvno, int switches)
 #ifdef GUI_SUPPORT
 		remark_cmd(msg);
 #else
-		printf(msg);
+		printf("", msg);
 #endif
 	}
 
diff --git a/PDP11/pdp11_tu.c b/PDP11/pdp11_tu.c
index f933a7c0..bec28535 100644
--- a/PDP11/pdp11_tu.c
+++ b/PDP11/pdp11_tu.c
@@ -25,6 +25,7 @@
 
    tu           TM02/TM03 magtape
 
+   18-Apr-11    MP      Fixed t_addr printouts for 64b big-endian systems
    17-May-07    RMS     CS1 DVA resides in device, not MBA
    29-Apr-07    RMS     Fixed bug in setting FCE on TMK (found by Naoki Hamada)
    16-Feb-06    RMS     Added tape capacity checking
@@ -466,10 +467,12 @@ UNIT *uptr;
 fnc = GET_FNC (tucs1);                                  /* get function */
 den = GET_DEN (tutc);                                   /* get density */
 uptr = tu_dev.units + drv;                              /* get unit */
-if (DEBUG_PRS (tu_dev))
-    fprintf (sim_deb, ">>TU%d STRT: fnc=%s, fc=%06o, fs=%06o, er=%06o, pos=%d\n",
+if (DEBUG_PRS (tu_dev)) {
+    fprintf (sim_deb, ">>TU%d STRT: fnc=%s, fc=%06o, fs=%06o, er=%06o, pos=",
              drv, tu_fname[fnc], tufc, tufs, tuer, uptr->pos);
-
+    fprint_val (sim_deb, uptr->pos, 10, T_ADDR_W, PV_LEFT);
+    fprintf (sim_deb, "\n");
+    }
 if ((fnc != FNC_FCLR) &&                                /* not clear & err */
     ((tufs & FS_ERR) || sim_is_active (uptr))) {        /* or in motion? */
     tu_set_er (ER_ILF);                                 /* set err */
@@ -786,9 +789,12 @@ if (fnc >= FNC_XFER) {                                  /* data xfer? */
     tu_update_fs (0, drv);                              /* update fs */
     }
 else tu_update_fs (FS_ATA, drv);                        /* no, set attn */
-if (DEBUG_PRS (tu_dev))
-    fprintf (sim_deb, ">>TU%d DONE: fnc=%s, fc=%06o, fs=%06o, er=%06o, pos=%d\n",
-             drv, tu_fname[fnc], tufc, tufs, tuer, uptr->pos);
+if (DEBUG_PRS (tu_dev)) {
+    fprintf (sim_deb, ">>TU%d DONE: fnc=%s, fc=%06o, fs=%06o, er=%06o, pos=",
+             drv, tu_fname[fnc], tufc, tufs, tuer);
+    fprint_val (sim_deb, uptr->pos, 10, T_ADDR_W, PV_LEFT);
+    fprintf (sim_deb, "\n");
+    }
 return SCPE_OK;
 }
 
diff --git a/VAX/vax780_sbi.c b/VAX/vax780_sbi.c
index e7f4bf23..b89ff22d 100644
--- a/VAX/vax780_sbi.c
+++ b/VAX/vax780_sbi.c
@@ -141,7 +141,7 @@ t_stat vax780_boot (int32 flag, char *ptr);
 t_stat vax780_boot_parse (int32 flag, char *ptr);
 t_stat cpu_boot (int32 unitno, DEVICE *dptr);
 
-extern t_stat vax780_fload (int flag, char *cptr);
+extern t_stat vax780_fload (int32 flag, char *cptr);
 extern int32 intexc (int32 vec, int32 cc, int32 ipl, int ei);
 extern int32 iccs_rd (void);
 extern int32 nicr_rd (void);
diff --git a/VAX/vax_sysdev.c b/VAX/vax_sysdev.c
index 169456d9..58aaa27e 100644
--- a/VAX/vax_sysdev.c
+++ b/VAX/vax_sysdev.c
@@ -920,7 +920,7 @@ return;
 struct reglink {                                        /* register linkage */
     uint32      low;                                    /* low addr */
     uint32      high;                                   /* high addr */
-    t_stat      (*read)(int32 pa);                      /* read routine */
+    int32       (*read)(int32 pa);                      /* read routine */
     void        (*write)(int32 pa, int32 val, int32 lnt); /* write routine */
     };
 
diff --git a/scp.c b/scp.c
index 76ffd840..b0f14ff3 100644
--- a/scp.c
+++ b/scp.c
@@ -1200,7 +1200,7 @@ return SCPE_UNK;                                        /* only valid inside of
 t_stat on_cmd (int32 flag, char *cptr)
 {
 char gbuf[CBUFSIZE];
-int32 cond;
+t_stat cond;
 
 cptr = get_glyph (cptr, gbuf, 0);
 if ('\0' == gbuf[0]) return SCPE_ARG;                   /* unspecified condition */
diff --git a/sim_console.c b/sim_console.c
index acfdbd12..60a69b07 100644
--- a/sim_console.c
+++ b/sim_console.c
@@ -343,7 +343,8 @@ t_stat sim_show_log (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr)
 if (cptr && (*cptr != 0))
     return SCPE_2MARG;
 if (sim_log)
-    fprintf (st, "Logging enabled to %s\n", sim_logfile_name (sim_log, sim_log_ref));
+    fprintf (st, "Logging enabled to \"%s\"\n", 
+                 sim_logfile_name (sim_log, sim_log_ref));
 else fprintf (st, "Logging disabled\n");
 return SCPE_OK;
 }
@@ -399,7 +400,8 @@ t_stat sim_show_debug (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cpt
 if (cptr && (*cptr != 0))
     return SCPE_2MARG;
 if (sim_deb)
-    fprintf (st, "Debug output enabled\n", sim_logfile_name (sim_deb, sim_deb_ref));
+    fprintf (st, "Debug output enabled to \"%s\"\n", 
+                 sim_logfile_name (sim_deb, sim_deb_ref));
 else fprintf (st, "Debug output disabled\n");
 return SCPE_OK;
 }