User`s manual

Pentium

OverDrive Ready System Board

F-3 u Appendix F

Note:

Any or all interrupts including NMI may be masked.

The 15 levels of system interrupts from high to low are

ordered as: IRQ0>IRQ1>IRQ8>IRQ9>IRQ10>IRQ11

>IRQ12>IRQ13>IRQ14>IRQ15>IRQ3>IRQ4>IRQ5>

IRQ6>IRQ7.

System Timers

Channel 0 System Timer (IRQ0)

Channel 1 Refresh Request Generator

(15us Rate Generator Period Signal)

Channel 2 Tone Generation for Speaker

Real-Time Clock

Address Function

00 Seconds

01 Second Alarm

02 Minutes

03 Minute Alarm

04 Hours

05 Hour Alarm

06 Day of Week

07 Date of Month

08 Month

09 Year

0A Register A

0B Register B

0C Register C

0D Register D