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-rw-r--r--src/mame/drivers/qix.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/mame/drivers/qix.c b/src/mame/drivers/qix.c
index e0a9d3884e2..9e9598cd84d 100644
--- a/src/mame/drivers/qix.c
+++ b/src/mame/drivers/qix.c
@@ -694,10 +694,12 @@ static MACHINE_CONFIG_DERIVED( slither, qix_base )
MCFG_DEVICE_MODIFY("pia1")
MCFG_PIA_READPA_HANDLER(READ8(qix_state, slither_trak_lr_r))
MCFG_PIA_WRITEPB_HANDLER(WRITE8(qix_state, slither_76489_0_w))
+ MCFG_PIA_READPB_HANDLER(NULL)
MCFG_DEVICE_MODIFY("pia2")
MCFG_PIA_READPA_HANDLER(READ8(qix_state, slither_trak_ud_r))
MCFG_PIA_WRITEPB_HANDLER(WRITE8(qix_state, slither_76489_1_w))
+ MCFG_PIA_READPB_HANDLER(NULL)
/* video hardware */
MCFG_FRAGMENT_ADD(slither_video)