2 BZ(Speaker)
3 Keyboard Data(from keyboard MCU TxD)
4 NC
- 5 FG
+ 5 GND
6 Unknown Input(to keyboard MCU RxD via schmitt trigger)
7 Mouse Data(from Mouse Ext connector)
8 Unknown Input(to Keyboard MCU Input via diode and buffer)
- 9 GND
+ 9 FG
NOTE: Two LED on keyboard are controlled by pin 6,8?
EIA 232 male connector from NWP-411A
2 BZ(Speaker)
3 Keyboard Data(from keyboard MCU TxD)
4 NC
- 5 FG
+ 5 GND
6 NC
7 Mouse Data(from Mouse Ext connector)
8 NC
- 9 GND
+ 9 FG
NOTE: These are just from my guess and not confirmed.