diff --git a/src/devices/machine/keyboard.cpp b/src/devices/machine/keyboard.cpp
index 182751b46cc..6f7c7fb125f 100644
--- a/src/devices/machine/keyboard.cpp
+++ b/src/devices/machine/keyboard.cpp
@@ -158,7 +158,7 @@ INPUT_PORTS_START( generic_keyboard )
 	PORT_BIT( 0x0100U, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_8)          PORT_CONDITION("GENKBD_CFG", 0x01, EQUALS, 0x01)                         PORT_CHAR('8')   PORT_CHAR('(')
 	PORT_BIT( 0x0200U, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_9)          PORT_CONDITION("GENKBD_CFG", 0x01, EQUALS, 0x00)                         PORT_CHAR('9')   PORT_CHAR('(')
 	PORT_BIT( 0x0200U, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_9)          PORT_CONDITION("GENKBD_CFG", 0x01, EQUALS, 0x01)                         PORT_CHAR('9')   PORT_CHAR(')')
-	PORT_BIT( 0x0400U, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_0)          PORT_CONDITION("GENKBD_CFG", 0x01, EQUALS, 0x00)                         PORT_CHAR('0')   PORT_CHAR('(')
+	PORT_BIT( 0x0400U, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_0)          PORT_CONDITION("GENKBD_CFG", 0x01, EQUALS, 0x00)                         PORT_CHAR('0')   PORT_CHAR(')')
 	PORT_BIT( 0x0400U, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_0)          PORT_CONDITION("GENKBD_CFG", 0x01, EQUALS, 0x01)                         PORT_CHAR('0')
 	PORT_BIT( 0x0800U, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_MINUS)      PORT_CONDITION("GENKBD_CFG", 0x01, EQUALS, 0x00)                         PORT_CHAR('-')   PORT_CHAR('_')
 	PORT_BIT( 0x0800U, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_MINUS)      PORT_CONDITION("GENKBD_CFG", 0x01, EQUALS, 0x01)                         PORT_CHAR('-')   PORT_CHAR('=')
diff --git a/src/mame/machine/gridkeyb.cpp b/src/mame/machine/gridkeyb.cpp
index 0d00db9d4cb..59f4bf8529e 100644
--- a/src/mame/machine/gridkeyb.cpp
+++ b/src/mame/machine/gridkeyb.cpp
@@ -125,7 +125,7 @@ INPUT_PORTS_START( grid_keyboard )
 	PORT_BIT( 0x0080U, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_7)                                  PORT_CHAR('7')   PORT_CHAR('&')
 	PORT_BIT( 0x0100U, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_8)                                  PORT_CHAR('8')   PORT_CHAR('*')
 	PORT_BIT( 0x0200U, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_9)                                  PORT_CHAR('9')   PORT_CHAR('(')
-	PORT_BIT( 0x0400U, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_0)                                  PORT_CHAR('0')   PORT_CHAR('(')
+	PORT_BIT( 0x0400U, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_0)                                  PORT_CHAR('0')   PORT_CHAR(')')
 	PORT_BIT( 0x0800U, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_MINUS)                              PORT_CHAR('-')   PORT_CHAR('_')
 	PORT_BIT( 0x1000U, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_EQUALS)                             PORT_CHAR('=')   PORT_CHAR('+')
 	PORT_BIT( 0x2000U, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_BACKSPACE)  PORT_NAME("Backspace") PORT_CHAR(0x08U)