IEI Technology WAFER-945GSE, User Manual, Page: 174 / 182

WAFER-945GSE 3.5" Motherboard
Page 159
D.1 Introduction
The DIO connector on the WAFER-945GSE is interfaced to GPIO ports on the Super I/O
chipset. The DIO has both 4-bit digital inputs and 4-bit digital outputs. The digital inputs
and digital outputs are generally control signals that control the on/off circuit of external
devices or TTL devices. Data can be read or written to the selected address to enable the
DIO functions.
NOTE:
For further information, please refer to the datasheet for the Super I/O
chipset.
D.2 DIO Connector Pinouts
Pin Description Super I/O Pin Super I/O Pin Description
1 Ground N/A N/A
2 VCC N/A N/A
3 Output 3 GP23 General Purpose I/O Port 2 Bit 3
4 Output 2 GP22 General Purpose I/O Port 2 Bit 2
5 Output 1 GP21 General Purpose I/O Port 2 Bit 1
6 Output 0 GP20 General Purpose I/O Port 2 Bit 0
7 Input 3 GP33 General Purpose I/O 33
8 Input 2 GP32 General Purpose I/O 32
9 Input 1 GP31 General Purpose I/O 31
10 Input 0 GP30 General Purpose I/O 30
D.3 Assembly Language Samples
D.3.1 Enable the DIO Input Function
The BIOS interrupt call INT 15H controls the digital I/O. An assembly program to enable
digital I/O input functions is listed below.
MOV AX, 6F08H
Sets the digital port as input