Panasonic VP-0187A ================== It is unknown keyboard from Panasonic 6P6C connector Hirose Cheery M8 switches https://deskthority.net/wiki/Cherry_M8 Scan ---- The keyboard is comprised of some of 4000 series IC without microcontroller. RST>-----------+---------------+ | | TC4520 | TC4520 | --------- carry --------- CLK>--->|row |------>|col | |counter|Q3 |counter| --------- --------- Q012 Q012 ||| ||| ||| ABC TC4028 ||| --------- ||| |decoder| ||| --------- ||| |||||| col[0..7] ABC vvvvvvv pull down ---------- <----|+++++++|--100K--+ |data | <----|+++++++|--100K--+ STATE<--|selector| <----|+++++++|--100K--+ | 7 to 1 | <----|+++++++|--100K--+ ---------- <----|+++++++|--100K--+ row[0..7] | 8x8 matrix - GND Matrix ------ 0 1 2 3 4 5 6 7 -------------------------------------------------------------------- 0 ESC 1 2 3 4 5 6 7 1 8 9 0 - ^ BS INS DEL 2 TAB Q W E R T Y U 3 I O P @ [ ] F2 F1 4 CTRL A S D F G H J 5 K L ; : RETURN UP F3 F4 6 SHIFT Z X C V B N M 7 SPACE , . / LEFT RIGHT DOWN HOME 6P6C connector pinout --------------------- 1. VCC 2. Clock - sends clock to binary counter TC4520 3. Key State - indicates hi if key selected by counter is active 4. Sense - indicates hi if any key is active while Reset is hi. 5. Reset - resets counter and drives all column 6. GND 123456 ,--------. | | | | `--____--' plug