From 35b59c63e8b0f8844d3dcb61be6308673db023b0 Mon Sep 17 00:00:00 2001
From: Lars Brinkhoff <lars@nocrew.org>
Date: Fri, 23 Jul 2021 09:12:16 +0200
Subject: [PATCH] Make ITS check whether the Type 340 display is up and
 running.

Now that ITS will honor the DSDP switch, it might not check the CONI
DIS bit 0 to see if the 340 is available.  This leads to a situation
where the display could be turned off but ITS thinks it's always
online and will try to use it.

This commit adds a check writing some CONO bits and read them back
with CONI.
---
 src/system/{itsdev.976 => itsdev.977} | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
 rename src/system/{itsdev.976 => itsdev.977} (99%)

diff --git a/src/system/itsdev.976 b/src/system/itsdev.977
similarity index 99%
rename from src/system/itsdev.976
rename to src/system/itsdev.977
index 3b8efe44..4bc96a4f 100755
--- a/src/system/itsdev.976
+++ b/src/system/itsdev.977
@@ -2650,7 +2650,10 @@ ADSDV:		;A HAS NEW 340MD
 	CONO DIS,0
 	CONI DIS,T
 	JUMPE T,ADSDVN	;DIS NOT AVAIABLE
-ADSDV1:	SKIPL T,DISUSR
+ADSDV1:	CONO DIS,DISCHN
+	CONSO DIS,7
+	 JRST ADSDVN	;DIS NOT RUNNING
+	SKIPL T,DISUSR
 	CAMN U,DISUSR
 	JRST ADSDVY	;YES
 	CAME U,UMASTER