diff --git a/src/mame/drivers/ampex.cpp b/src/mame/drivers/ampex.cpp
index 815ca764ed1..ef31c5ddfaf 100644
--- a/src/mame/drivers/ampex.cpp
+++ b/src/mame/drivers/ampex.cpp
@@ -295,7 +295,7 @@ static INPUT_PORTS_START( ampex )
 	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHAR(UCHAR_MAMEKEY(1_PAD)) PORT_CODE(KEYCODE_1_PAD)
 	PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHAR(UCHAR_MAMEKEY(RIGHT)) PORT_CODE(KEYCODE_RIGHT)
 	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHAR(UCHAR_MAMEKEY(HOME)) PORT_CODE(KEYCODE_HOME)
-	PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_UNKNOWN) // 0x7f (rub out?)
+	PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Del") PORT_CODE(KEYCODE_RCONTROL) // 0x7f
 	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_UNUSED)
 
 	PORT_START("INA")
@@ -320,9 +320,9 @@ static INPUT_PORTS_START( ampex )
 
 	PORT_START("INC")
 	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_UNUSED)
-	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_UNKNOWN) // 0x87 (shifted: 0x87)
-	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_UNKNOWN) // 0x85 (shifted: 0x85)
-	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_UNKNOWN) // 0x89 (shifted: 0x89)
+	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_UNKNOWN) // 0x87 (shifted: 0x86)
+	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_UNKNOWN) // 0x85 (shifted: 0x84)
+	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_UNKNOWN) // 0x89 (shifted: 0x88)
 	PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_UNKNOWN) // 0x92 (shifted: 0x93)
 	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_UNKNOWN) // 0x91
 	PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_UNKNOWN) // 0xb5 (shifted: 0xb7)