Epson PX-8 Technical Manual page 14

REV.-A
21---------3 1
Table 1-9 CN4 (Keyboard Interface) Pin Assignments
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22--------4 2
Pin No. Signal Name Definition
1 KSC 0
Key scan signal
2 KSC 1 Key scan signal
3
KSC 2 Key scan signal
4 KSC 3 Key scan signal
5 KSC 4 Key scan signal
6
KSC
5
Key scan signal
7 KSC 6 Key scan signal
8 KSC 7 Key scan signal
9
KSC
8
Key scan signal
10 KRTN 0 Key return signal
11 KRTN 1 Key return signal
12 KRTN 2 Key return signal
13 KRTN 3 Key return signal
14 KRTN 4 Key return signal
15 KRTN 5 Key return signal
16 KRTN 6 Key return signal
17 KRTN 7 Key return signal
18 LED 0
CAPS LOCK MODE
19 LED 1
NUMERIC MODE
20
LED
2
INSERT MODE
21,22
GND Ground
1-10