From 4c63df0d5b4267c848bce91303a9361cf072b568 Mon Sep 17 00:00:00 2001
From: smf- <smf-@users.noreply.github.com>
Date: Thu, 19 May 2022 09:17:50 +0100
Subject: [PATCH] Don't forget the current state of dsr & rts when changing
 serial settings in null modem device. [smf]

---
 src/devices/bus/rs232/null_modem.cpp | 2 --
 src/devices/bus/rs232/null_modem.h   | 2 ++
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/devices/bus/rs232/null_modem.cpp b/src/devices/bus/rs232/null_modem.cpp
index 2c5ff25b0c3..f2830ef2088 100644
--- a/src/devices/bus/rs232/null_modem.cpp
+++ b/src/devices/bus/rs232/null_modem.cpp
@@ -75,8 +75,6 @@ WRITE_LINE_MEMBER(null_modem_device::update_serial)
 	output_dsr(0);
 	output_cts(0);
 
-	m_rts = 0;
-	m_dtr = 0;
 	m_xoff = 0;
 }
 
diff --git a/src/devices/bus/rs232/null_modem.h b/src/devices/bus/rs232/null_modem.h
index 03e05019baa..206ddfa6a1c 100644
--- a/src/devices/bus/rs232/null_modem.h
+++ b/src/devices/bus/rs232/null_modem.h
@@ -3,6 +3,8 @@
 #ifndef MAME_BUS_RS232_NULL_MODEM_H
 #define MAME_BUS_RS232_NULL_MODEM_H
 
+#pragma once
+
 #include "rs232.h"
 #include "imagedev/bitbngr.h"
 #include "diserial.h"