From ab8b5cb95b22bf2ee13e1c7d81e0c09e3c070fb0 Mon Sep 17 00:00:00 2001
From: Wilbert Pol <wilbertpol@users.noreply.github.com>
Date: Mon, 10 Aug 2015 21:29:25 +0200
Subject: [PATCH] a2600.c: Replaced ioport tagmap lookup (nw)

---
 src/mess/drivers/a2600.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/mess/drivers/a2600.c b/src/mess/drivers/a2600.c
index 1b80eb4c5ad..4868d07bd39 100644
--- a/src/mess/drivers/a2600.c
+++ b/src/mess/drivers/a2600.c
@@ -37,7 +37,9 @@ public:
 		m_cart(*this, "cartslot"),
 		m_tia(*this, "tia_video"),
 		m_maincpu(*this, "maincpu"),
-		m_screen(*this, "screen") { }
+		m_screen(*this, "screen"),
+		m_swb(*this, "SWB")
+	{ }
 
 	required_shared_ptr<UINT8> m_riot_ram;
 	UINT16 m_current_screen_height;
@@ -66,6 +68,7 @@ protected:
 	unsigned long detect_2600controllers();
 	required_device<m6502_device> m_maincpu;
 	required_device<screen_device> m_screen;
+	required_ioport m_swb;
 };
 
 
@@ -124,7 +127,7 @@ WRITE_LINE_MEMBER(a2600_state::irq_callback)
 
 READ8_MEMBER(a2600_state::riot_input_port_8_r)
 {
-	return ioport("SWB")->read();
+	return m_swb->read();
 }