Akashi-10

Test board of the EL-210 calculator

Description

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.

Pin assignment

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.

Photo

This is photo of the version 1.0.0.