diff --git a/src/mame/drivers/taito_b.c b/src/mame/drivers/taito_b.c
index 5d41d18b959..772ff22c060 100644
--- a/src/mame/drivers/taito_b.c
+++ b/src/mame/drivers/taito_b.c
@@ -520,7 +520,7 @@ static ADDRESS_MAP_START( tetrista_map, ADDRESS_SPACE_PROGRAM, 16 )
 	AM_RANGE(0x200000, 0x201fff) AM_RAM_WRITE(paletteram16_RRRRGGGGBBBBxxxx_word_w) AM_BASE_GENERIC(paletteram)
 	TC0180VCU_MEMRW( 0x400000 )
 	AM_RANGE(0x600000, 0x600001) AM_DEVREADWRITE8("tc0220ioc", tc0220ioc_portreg_r, tc0220ioc_portreg_w, 0xff00)
-	AM_RANGE(0x600002, 0x600003) AM_DEVREADWRITE8("tc0220ioc", tc0220ioc_r, tc0220ioc_w, 0xff00)
+	AM_RANGE(0x600002, 0x600003) AM_DEVREADWRITE8("tc0220ioc", tc0220ioc_port_r, tc0220ioc_port_w, 0xff00)
 	AM_RANGE(0x800000, 0x803fff) AM_RAM	/* Main RAM */
 	AM_RANGE(0xa00000, 0xa00001) AM_READNOP AM_DEVWRITE8("tc0140syt", tc0140syt_port_w, 0xff00)
 	AM_RANGE(0xa00002, 0xa00003) AM_DEVREADWRITE8("tc0140syt", tc0140syt_comm_r, tc0140syt_comm_w, 0xff00)
@@ -641,7 +641,7 @@ static ADDRESS_MAP_START( masterw_map, ADDRESS_SPACE_PROGRAM, 16 )
 	TC0180VCU_MEMRW( 0x400000 )
 	AM_RANGE(0x600000, 0x601fff) AM_RAM_WRITE(paletteram16_RRRRGGGGBBBBxxxx_word_w) AM_BASE_GENERIC(paletteram)
 	AM_RANGE(0x800000, 0x800001) AM_DEVREADWRITE8("tc0220ioc", tc0220ioc_portreg_r, tc0220ioc_portreg_w, 0xff00)
-	AM_RANGE(0x800002, 0x800003) AM_DEVREADWRITE8("tc0220ioc", tc0220ioc_r, tc0220ioc_w, 0xff00)
+	AM_RANGE(0x800002, 0x800003) AM_DEVREADWRITE8("tc0220ioc", tc0220ioc_port_r, tc0220ioc_port_w, 0xff00)
 	AM_RANGE(0xa00000, 0xa00001) AM_READNOP AM_DEVWRITE8("tc0140syt", tc0140syt_port_w, 0xff00)
 	AM_RANGE(0xa00002, 0xa00003) AM_DEVREADWRITE8("tc0140syt", tc0140syt_comm_r, tc0140syt_comm_w, 0xff00)
 ADDRESS_MAP_END