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-rw-r--r--src/mame/machine/ms7004.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mame/machine/ms7004.cpp b/src/mame/machine/ms7004.cpp
index bc84c17bb40..bbfb59fbfd7 100644
--- a/src/mame/machine/ms7004.cpp
+++ b/src/mame/machine/ms7004.cpp
@@ -65,7 +65,7 @@ MACHINE_CONFIG_START(ms7004_device::device_add_mconfig)
MCFG_MCS48_PORT_T1_IN_CB(READLINE(*this, ms7004_device, t1_r))
MCFG_MCS48_PORT_PROG_OUT_CB(WRITELINE("i8243", i8243_device, prog_w))
- MCFG_I8243_ADD("i8243", NOOP, WRITE8(*this, ms7004_device, i8243_port_w))
+ MCFG_I8243_ADD("i8243", CONSTANT(0), WRITE8(*this, ms7004_device, i8243_port_w))
SPEAKER(config, "mono").front_center();
MCFG_DEVICE_ADD(MS7004_SPK_TAG, BEEP, 3250)