73 lines
2.2 KiB
Text
73 lines
2.2 KiB
Text
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
|
|
|