User`s manual

ENDAT-2794A USERS MANUAL
UNICORN COMPUTER CORP.
22
DIGITAL I/O Pin (DIO-O3) Register configuration (register number: D1):
bit No 7 6 5 4 3 2 1 0
Map NA NA NA NA NA NA NA DIO-O3
Sample code for output (using Turbo C/C++ 3.0)
outportb(0x4e,0x87); //Unlock register
outportb(0x4e,0x87); //Unlock register
outportb(0x4e,0x07); //Set Logic Device number pointer
outportb(0x4f,0x06); //Set Logic Device number.
outportb(0x4e,0xD1); //Set active register is CRD1
outportb(0x4f,0x01); //Set bit7 (DIO-O3) as logical high