User`s manual

8.1.3 Jumper Setting:
Note:
user should remove R19, R20, R21, R22 and R23 in the 7188XC first.
J1: I/O expansion bus, connect to J1 of 7188XC
J2: I/O expansion bus, connect to J2 of 7188XC
J7: Three channels of 8 DI
TP0: Original function on 7188XC
TP1: Five channels of 8 DI
Jumper: Select TP0 or TP1 function
TP0: J9 and J8 closed
TP1: J9 and J10 closed
8.1.4 Programming:
DiVal = inportb(BASE); /* for all 8-channels */
Note: 1. The default value of BASE is 0.
2. It is not recommended to change the value of BASE from 0 to another
value.
3. DiVal=0  all 8-channel are Low
DiVal=1  Chennel_0 is High, the other channels are Low
DiVal=0xff  all 8-channel are High
I/O Expansion Bus for 7188X/7188E User’s Manual, Jun/2004 v1.4, 7PH-000-14---43