3 It is unknown keyboard from Panasonic
7 Hirose Cheery M8 switches
8 https://deskthority.net/wiki/Cherry_M8
14 The keyboard is comprised of some of 4000 series IC without microcontroller.
17 RST>-----------+---------------+
20 --------- carry ---------
21 CLK>--->|row |------>|col |
32 ---------- <----|+++++++|--100K--+
33 |data | <----|+++++++|--100K--+
34 STATE<--|selector| <----|+++++++|--100K--+
35 | 7 to 1 | <----|+++++++|--100K--+
36 ---------- <----|+++++++|--100K--+
46 --------------------------------------------------------------------
48 1 8 9 0 - ^ BS INS DEL
52 5 K L ; : RETURN UP F3 F4
54 7 SPACE , . / LEFT RIGHT DOWN HOME
61 2. Clock - sends clock to binary counter TC4520
62 3. Key State - indicates hi if key selected by counter is active
63 4. Sense - indicates hi if any key is active while Reset is hi.
64 5. Reset - resets counter and drives all column