From ba534e8d1f9138131b59ad87ce106ffc13cbbfab Mon Sep 17 00:00:00 2001
From: Lars Brinkhoff <lars@nocrew.org>
Date: Sat, 13 Jul 2019 09:44:58 -0400
Subject: [PATCH] KA10: Make TEN11 more robust in the face of network errors.

---
 PDP10/ka10_ten11.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/PDP10/ka10_ten11.c b/PDP10/ka10_ten11.c
index 81863c9..b7f817d 100644
--- a/PDP10/ka10_ten11.c
+++ b/PDP10/ka10_ten11.c
@@ -262,7 +262,11 @@ static int read_word (int addr, int *data)
   build (request, (addr >> 8) & 0377);
   build (request, (addr) & 0377);
 
-  transaction (request, response);
+  if (transaction (request, response) == -1) {
+    /* Network error. */
+    *data = 0;
+    return 0;
+  }
 
   switch (response[0])
     {