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Chapter 5 Input/Output Interfaces

5.6.2 POINTING DEVICE INTERFACE OPERATION

The pointing device (typically a mouse) connects to a 6-pin DIN-type connector that is identical

to the keyboard connector both physically and electrically. The operation of the interface (clock

and data signal control) is the same as for the keyboard. The pointing device interface uses the

IRQ12 interrupt.

5.6.3 KEYBOARD/POINTING DEVICE INTERFACE PROGRAMMING

Programming the keyboard interface consists of configuration, which occurs during POST, and

control, which occurs during runtime.

5.6.3.1 8042 Configuration

The keyboard/pointing device interface must be enabled and configured for a particular speed

before it can be used. Enabling and speed parameters of the 8042 logic are affected through the

PnP configuration registers of the LPC47B387 I/O controller. Enabling and speed control are

automatically set by the BIOS during POST but can also be accomplished with the Setup utility

and other software.

The keyboard interface configuration registers are listed in the following table:

Table 5-17. Keyboard Interface Configuration Registers

Table 5-17.

Keyboard Interface Configuration Registers

Index

Address

Function

R/W

30h Activate R/W

70h Primary Interrupt Select R/W

72h Secondary Interrupt Select R/W

F0h Reset and A20 Select R/W

5-20 hp compaq d330 and d530 Series of Personal Computers

Featuring the Intel Pentium 4 Processor

First Edition – June 2003

HP Compaq d330 DT User Manual

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