diff --git a/PDP18B/pdp18b_dr15.c b/PDP18B/pdp18b_dr15.c
index d00d8407..934ed1e6 100644
--- a/PDP18B/pdp18b_dr15.c
+++ b/PDP18B/pdp18b_dr15.c
@@ -141,8 +141,6 @@ DEVICE dr15_dev = {
 
 int32 dr60 (int32 dev, int32 pulse, int32 AC)
 {
-int32 subdev = (pulse >> 4) & 03;
-
 if (((pulse & 01) != 0) && (dr15_tcb_ack != 0))         /* SIOA */
     AC |= IOT_SKP;
 if ((pulse & 02) != 0)                                  /* CIOP */
diff --git a/PDP18B/pdp18b_lp.c b/PDP18B/pdp18b_lp.c
index 58852ff8..0db2ec41 100644
--- a/PDP18B/pdp18b_lp.c
+++ b/PDP18B/pdp18b_lp.c
@@ -834,10 +834,10 @@ for (more = 1; more != 0; ) {                           /* loop until ctrl */
         ccnt = 5;
         }
     for (i = 0; i < ccnt; i++) {                        /* loop through */
-        if ((c[i] <= 037) && ctrl[c[i]]) {              /* control char? */
+        if ((c[i] <= 037) && ctrl[c[i] & 037]) {        /* control char? */
             lp15_buf[lp15_bp] = 0;                      /* append nul */
             fputs (lp15_buf, uptr->fileref);            /* print line */
-            fputs (ctrl[c[i]], uptr->fileref);          /* space */
+            fputs (ctrl[c[i] & 037], uptr->fileref);    /* space */
             uptr->pos = ftell (uptr->fileref);
             if (ferror (uptr->fileref)) {               /* error? */
                 sim_perror ("LPT I/O error");