Technical data

Contents
viii
Keyboard and Mouse 1-13
Repair Services 1-14
2 Functional Description
Overview 2-2
System Board 2-2
CPU Circuit 2-4
Boot ROM Circuit 2-4
System Failure LED 2-5
Power LED 2-5
Graphics Circuit 2-6
Keyboard 2-7
Memory Controller Circuit 2-7
Memory Map 2-8
I/O Controller ASIC 2-10
Built-in Interfaces 2-11
Audio 2-11
HP Parallel 2-13
RS-232 Ports 2-14
AUI LAN 2-16
SCSI 2-17
PS/2 Ports 1 and 0 2-19
VME Controller ASIC 2-20
Graphics Accessory Cards 2-23
RAM Cards 2-24
Interval Timers 2-26