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PAD128 Manual
Page 6-10
Manual MPAD128.D1g
This corresponds to 98 hex. If the card base address is 2D0 hex, use the C command to
write to the control register as follows:
Base=0x2D0;
outportb(Base, 0x98);
To read the inputs at Port A use the C inportb command:
X=inportb(Base); //Read Port A
To set outputs high (1) at Port B:
outportb(Base +1,0xff); //Turn on all Port B bits
Each time the card is initialized, program the control register at Base + 23 for which
mode and I/O configuration is needed. From then on, reading and writing to the digital
I/O is simple.