diff --git a/VAX/vax4xx_ve.c b/VAX/vax4xx_ve.c
index 1ef77992..2a8952c5 100644
--- a/VAX/vax4xx_ve.c
+++ b/VAX/vax4xx_ve.c
@@ -474,6 +474,8 @@ if (tbc_fifo[id].count < FIFO_LEN) {
         tbc_fifo[id].get_ptr = 0;
     tbc_fifo[id].count = tbc_fifo[id].count + 4;
     }
+else
+    *data = 0;
 }
 
 void ve_clear_fifo (uint32 id)
diff --git a/VAX/vax_gpx.c b/VAX/vax_gpx.c
index 2d020e20..02dfd129 100644
--- a/VAX/vax_gpx.c
+++ b/VAX/vax_gpx.c
@@ -1696,7 +1696,7 @@ sim_debug (DBG_ROP, gpx_dev, "\n");
 
 t_stat va_ptb (UNIT *uptr, t_bool zmode)
 {
-uint32 val, sc;
+uint32 val = 0, sc;
 t_bool clip;
 
 if ((uptr->CMD != CMD_PTBX) && (uptr->CMD != CMD_PTBZ))
@@ -1768,6 +1768,7 @@ if ((va_adp[ADP_STAT] & ADPSTAT_RC) && (va_adp_fifo_sz == 0)) {
     va_adpstat (ADPSTAT_AC, 0);
     return SCPE_OK;
     }
+sc = 0;
 for (val = 0;;) {
     if (zmode) {
         if ((va_adp[ADP_STAT] & ADPSTAT_ITR) == 0)      /* no space in FIFO? */
diff --git a/VAX/vax_lk.c b/VAX/vax_lk.c
index d824bac2..a2500cf1 100644
--- a/VAX/vax_lk.c
+++ b/VAX/vax_lk.c
@@ -277,8 +277,10 @@ if (fifo->count > 0) {
     fifo->count--;
     return SCPE_OK;
     }
-else
+else {
+    *data = 0;
     return SCPE_EOF;
+    }
 }
 
 void lk_clear_fifo (LK_FIFO *fifo)