From 4d530f5bf3407288eedefff27e5665a065ebe1cc Mon Sep 17 00:00:00 2001
From: Richard Cornwell <rcornwell@github.com>
Date: Fri, 27 Dec 2019 15:14:12 -0500
Subject: [PATCH] B5500: Fixed DTC to fix error caused by SCP changes.

---
 B5500/b5500_dtc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/B5500/b5500_dtc.c b/B5500/b5500_dtc.c
index 958bf57..d739fc0 100644
--- a/B5500/b5500_dtc.c
+++ b/B5500/b5500_dtc.c
@@ -727,7 +727,8 @@ dtco_srv(UNIT * uptr)
                     t = 0;
                     continue;   /* On to next line */
                  }
-                 sim_debug(DEBUG_DATA, &dtc_dev,
+                 if (c1 != 0)
+                     sim_debug(DEBUG_DATA, &dtc_dev,
                         "Datacomm transmit %d %02o %c\n", ln, c&077, c1);
                  tmxr_putc_ln(&dtc_ldsc[ln], c1);
                  if (c1 == '\n') {