diff --git a/src/mame/drivers/8080bw.c b/src/mame/drivers/8080bw.c
index fc081ed568b..262feb4b745 100644
--- a/src/mame/drivers/8080bw.c
+++ b/src/mame/drivers/8080bw.c
@@ -156,6 +156,10 @@
         sound, a sort of rattling noise. Unable to find evidence
         of this (so far).
 
+    - Steel Worker, Space Commander
+        Holding down the coin button causes the credits to rapidly increase.
+
+
 *****************************************************************************/
 
 #include "emu.h"
@@ -2036,7 +2040,7 @@ WRITE8_MEMBER(_8080bw_state::steelwkr_sh_port_3_w)
 
 static ADDRESS_MAP_START( steelwkr_io_map, AS_IO, 8, _8080bw_state )
 	AM_RANGE(0x01, 0x01) AM_READ_PORT("IN1")
-	AM_RANGE(0x02, 0x02) AM_READ_PORT("IN2") AM_DEVWRITE_LEGACY("mb14241", mb14241_shift_count_w)
+	AM_RANGE(0x02, 0x02) AM_READ(invrvnge_02_r) AM_DEVWRITE_LEGACY("mb14241", mb14241_shift_count_w)
 	AM_RANGE(0x03, 0x03) AM_DEVREAD_LEGACY("mb14241", mb14241_shift_result_r) AM_WRITE(invadpt2_sh_port_1_w)
 	AM_RANGE(0x04, 0x04) AM_DEVWRITE_LEGACY("mb14241", mb14241_shift_data_w)
 	AM_RANGE(0x05, 0x05) AM_WRITE(invadpt2_sh_port_2_w)