diff --git a/src/mame/machine/mbc55x_kbd.cpp b/src/mame/machine/mbc55x_kbd.cpp
index 2090e129037..ba6d3e857c4 100644
--- a/src/mame/machine/mbc55x_kbd.cpp
+++ b/src/mame/machine/mbc55x_kbd.cpp
@@ -50,8 +50,8 @@ static INPUT_PORTS_START(mbc55x_kbd)
 	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("PF1  PF6") PORT_CHAR(UCHAR_MAMEKEY(F1)) PORT_CHAR(UCHAR_MAMEKEY(F6)) PORT_CODE(KEYCODE_F1)
 
 	PORT_START("Y1")
-	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("\xe2\x87\x90") PORT_CHAR(0x08) PORT_CODE(KEYCODE_BACKSPACE)
-	PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("\xe2\x86\xb9") PORT_CHAR(0x09) PORT_CODE(KEYCODE_TAB)
+	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYBOARD) /*PORT_NAME("\xe2\x87\x90")*/ PORT_CHAR(0x08) PORT_CODE(KEYCODE_BACKSPACE) // ⇐
+	PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD) /*PORT_NAME("\xe2\x86\xb9")*/ PORT_CHAR(0x09) PORT_CODE(KEYCODE_TAB) // ↹
 	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Space") PORT_CHAR(' ') PORT_CODE(KEYCODE_SPACE)
 	PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHAR('2') PORT_CHAR('@') PORT_CODE(KEYCODE_2)
 	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHAR('w') PORT_CHAR('W') PORT_CODE(KEYCODE_W)
@@ -61,7 +61,7 @@ static INPUT_PORTS_START(mbc55x_kbd)
 
 	PORT_START("Y2")
 	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Del  Ins") PORT_CHAR(UCHAR_MAMEKEY(DEL)) PORT_CHAR(UCHAR_MAMEKEY(INSERT)) PORT_CODE(KEYCODE_DEL)
-	PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("\xe2\x8f\x8e") PORT_CHAR(0x0d) PORT_CODE(KEYCODE_ENTER)
+	PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD) /*PORT_NAME("\xe2\x8f\x8e")*/ PORT_CHAR(0x0d) PORT_CODE(KEYCODE_ENTER) // ⏎
 	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Lock") PORT_CHAR(UCHAR_MAMEKEY(CAPSLOCK)) PORT_CODE(KEYCODE_LALT)
 	PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHAR('3') PORT_CHAR('#') PORT_CODE(KEYCODE_3)
 	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHAR('e') PORT_CHAR('E') PORT_CODE(KEYCODE_E)
@@ -110,7 +110,7 @@ static INPUT_PORTS_START(mbc55x_kbd)
 
 	PORT_START("Y7")
 	PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_UNUSED)
-	PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Keypad 7  \xe2\x86\x96") PORT_CHAR(UCHAR_MAMEKEY(7_PAD)) PORT_CODE(KEYCODE_7_PAD)
+	PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Keypad 7  \xe2\x86\x96") PORT_CHAR(UCHAR_MAMEKEY(7_PAD)) PORT_CODE(KEYCODE_7_PAD) // ↖
 	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Keypad 1  LF") PORT_CHAR(UCHAR_MAMEKEY(1_PAD)) PORT_CODE(KEYCODE_1_PAD)
 	PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHAR('8') PORT_CHAR('*') PORT_CODE(KEYCODE_8)
 	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHAR('i') PORT_CHAR('I') PORT_CODE(KEYCODE_I)
@@ -151,7 +151,7 @@ static INPUT_PORTS_START(mbc55x_kbd)
 	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHAR(']') PORT_CHAR('}') PORT_CODE(KEYCODE_CLOSEBRACE)
 	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHAR('`') PORT_CHAR('~') PORT_CODE(KEYCODE_TILDE) // to right of quote
 	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CHAR('*') PORT_CODE(KEYCODE_RCONTROL) // between slash and right shift
-	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Keypad \xe2\x8f\x8e") PORT_CHAR(UCHAR_MAMEKEY(ENTER_PAD)) PORT_CODE(KEYCODE_ENTER_PAD)
+	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) /*PORT_NAME("Keypad \xe2\x8f\x8e")*/ PORT_CHAR(UCHAR_MAMEKEY(ENTER_PAD)) PORT_CODE(KEYCODE_ENTER_PAD) // ⏎
 
 	PORT_START("BUS")
 	PORT_BIT(0x8f, IP_ACTIVE_LOW, IPT_UNUSED)