diff --git a/src/mame/drivers/wallc.cpp b/src/mame/drivers/wallc.cpp
index 80f547b3db1..8c8a8450ef6 100644
--- a/src/mame/drivers/wallc.cpp
+++ b/src/mame/drivers/wallc.cpp
@@ -209,9 +209,11 @@ static ADDRESS_MAP_START( unkitpkr_map, AS_PROGRAM, 8, wallc_state )
 	AM_RANGE(0x8000, 0x83ff) AM_RAM_WRITE(videoram_w) AM_MIRROR(0xc00) AM_SHARE("videoram")   /* 2114, 2114 */
 	AM_RANGE(0xa000, 0xa3ff) AM_RAM     /* 2114, 2114 */
 
-	AM_RANGE(0xb100, 0xb100) AM_READ_PORT("SYSTEM")
-	AM_RANGE(0xb200, 0xb200) AM_READ_PORT("IN0")
-	AM_RANGE(0xb300, 0xb300) AM_READ_PORT("IN1")
+	AM_RANGE(0xb000, 0xb000) AM_READ_PORT("SYSTEM")
+	AM_RANGE(0xb100, 0xb100) AM_READ_PORT("IN0")
+	AM_RANGE(0xb200, 0xb200) AM_READ_PORT("IN1")
+	AM_RANGE(0xb300, 0xb300) AM_READ_PORT("IN2")
+	AM_RANGE(0xb500, 0xb5ff) AM_READNOP // read by memory test routine left over from some other game
 	AM_RANGE(0xb600, 0xb600) AM_READ_PORT("DSW")
 
 	AM_RANGE(0xb000, 0xb000) AM_WRITENOP
@@ -279,7 +281,17 @@ static INPUT_PORTS_START( wallc )
 INPUT_PORTS_END
 
 static INPUT_PORTS_START( unkitpkr )
-	PORT_START("SYSTEM")    /* b100 */
+	PORT_START("SYSTEM")    /* b000 */
+	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNKNOWN )
+	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNKNOWN )
+	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNKNOWN )
+	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNKNOWN )
+	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNKNOWN )
+	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN )
+	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )
+	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )
+
+	PORT_START("IN0")    /* b100 */
 	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNKNOWN )
 	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNKNOWN )
 	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_MEMORY_RESET ) // coin clear?
@@ -289,7 +301,7 @@ static INPUT_PORTS_START( unkitpkr )
 	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_COIN2 )
 	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_COIN3 )
 
-	PORT_START("IN0")    /* b200 */
+	PORT_START("IN1")    /* b200 */
 	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNKNOWN )
 	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNKNOWN )
 	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNKNOWN )
@@ -299,7 +311,7 @@ static INPUT_PORTS_START( unkitpkr )
 	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_POKER_HOLD4 )
 	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_POKER_HOLD5 )
 
-	PORT_START("IN1")    /* b300 */
+	PORT_START("IN2")    /* b300 */
 	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNKNOWN )
 	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNKNOWN )
 	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_POKER_CANCEL )
@@ -590,7 +602,7 @@ ROM_END
 
 DRIVER_INIT_MEMBER(wallc_state, unkitpkr)
 {
-	// annoying line swapping
+	// line swapping is too annoying to handle with ROM_LOAD macros
 	uint8_t buffer[0x400];
 	for (int b = 0; b < 0x3000; b += 0x400)
 	{