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4.3 MAIN BOARD PIN ASSIGNMENTS (J1 Card Edge)
Left to right, looking at rear of case
P1 Connection Standard
A Spare (E16)
1 No connection
B No connection
2 Spare (E18)
C Spare (E19)
3 No connection
D No connection
4 No connection
E Spare (E43)
5 No connection
F 1999.9 (DP4)
6 Spare (E24)
H 199.99 (DP3)
7 Spare (E23)
J 19.999 (DP2)
8 Spare (E22)
K 1.9999 (DP1)
9 Spare (E25)
L Decimal point select
10 Spare (E26)
M Spare (E27)
11 –4.6 Vdc power output
N Spare (E29)
12 +4.7 Vdc power output
P – Excitation voltage
13 + Reference voltage
R
LAMP TEST (lights display segments)
14 + Excitation voltage
S Digital ground
15 HOLD (holds last display reading)
T Analog Ground
16 Spare (E32)
U BLANKING (blanks 4 least-significant digits)
17 Spare (E34)
V Oscillator (100 kHz output)
18 No connection