User`s manual

8.2.3 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 channel of 8 D/O
TP0: Original function on 7188XC
TP1: Five channel of 8 D/O
Jumper: Select TP0 or TP1 function
TP0: JP9 and JP8 closed
TP1: JP9 and JP10 closed
8.2.4 Programming:
outportb(BASE, DoVal); /* 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. DoVal=0  turn all 8-channel OFF
DoVal=1  turn chennel_0 ON, the other channels OFF
DoVal=0xff  turn all 8-channel ON
I/O Expansion Bus for 7188X/7188E User’s Manual, Jun/2004 v1.4, 7PH-000-14---45