Test board of the EL-210 calculator
This board is developed to test the functionality of the EL-210 Calculator controller. The EL-210 was released from SHARP Corporation at 1980.
This board tests its internal 9 digits VFD and 9x3 matrix keyboard. All signals and power from internal AA*2 batteries are taken out by 40pin headers.
The ping assignment of the 40pin headers are as followings :
| Pin | Symbol | Pin | Symbol |
|---|---|---|---|
| 1 | H1 | 2 | H2 |
| 3 | a | 4 | |
| 5 | D8 | 6 | R1 |
| 7 | g | 8 | R2 |
| 9 | D7 | 10 | R3 |
| 11 | f | 12 | C8 |
| 13 | D6 | 14 | C7 |
| 15 | e | 16 | C6 |
| 17 | D5 | 18 | C5 |
| 19 | D4 | 20 | C4 |
| 21 | d | 22 | C3 |
| 23 | D3 | 24 | C2 |
| 25 | dp | 26 | C1 |
| 27 | D2 | 28 | C0 |
| 29 | c | 20 | |
| 31 | D1 | 32 | |
| 33 | b | 34 | |
| 35 | D0 | 36 | |
| 37 | H2 | 38 | |
| 39 | H1 | 20 |
Where odd and even pins are signals of the VFD and the key matrix.
- H1, H2 : Heater.
- a .. f and dp : Segments ( Anode ).
- D0 .. D8 : Digits ( grid ).
- R1 .. R3 : Row 1 .. 3 of the key matrix.
- C0 .. C8 : Column 0 .. 8 of the key matrix.
This is photo of the version 1.0.0.
