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-rw-r--r--src/mame/drivers/suprloco.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mame/drivers/suprloco.cpp b/src/mame/drivers/suprloco.cpp
index f5bc3e4413f..4eb2794319b 100644
--- a/src/mame/drivers/suprloco.cpp
+++ b/src/mame/drivers/suprloco.cpp
@@ -188,6 +188,7 @@ static MACHINE_CONFIG_START( suprloco )
MCFG_DEVICE_ADD("ppi", I8255A, 0)
MCFG_I8255_OUT_PORTB_CB(WRITE8(suprloco_state, control_w))
+ MCFG_I8255_TRISTATE_PORTB_CB(CONSTANT(0))
MCFG_I8255_OUT_PORTC_CB(WRITELINE(suprloco_state, pc0_w)) MCFG_DEVCB_BIT(0)
MCFG_DEVCB_CHAIN_OUTPUT(INPUTLINE("audiocpu", INPUT_LINE_NMI)) MCFG_DEVCB_BIT(7) MCFG_DEVCB_INVERT