Fru-Level Operation; Cpu Board - HP 400 Series Servicing Manual

3.2

FRU-Level Operation

This section describes the operation of the major FRUs in the system. Refer to the ap-
propriate block diagram (Figure 3-1 through Figure 3-5) as you read the descriptions
of these FRUs. Refer to Chapter 4 for diagnostic procedures and to Chapter 5 for re-
moval and replacement procedures.
3.2.1

CPU Board

The CPU board controls the program flow in the system, and is the host for the follow-
ing system components:
•
•
•
•
The following lists show the most important elements of the CPU board's hardware.
An asterisk (*) next to some items denotes hardware that is not available on the Model
400dl.
•
• Boot ROM and EEPROM (for configuration data storage)
•
•
Memory boards
SCSI devices
Network and HP-IB boards
Graphics controller board or graphics processor interface board
The emulator board, which includes the following components:
– The MC68030 Microprocessor (the system's CPU)
– The MC68882 Floating-Point Coprocessor (FPU)
The Utility Interface, which includes the following:
– The system interrupt controller
– Three full-duplex programmable ports for Serial I/O (SIO)
– One full-duplex programmable serial port for the Apollo keyboard
The Integrated Interface Controllers, which include the following controllers:
– HP-HIL
– LAN (IEEE 8013 with ThinLAN and AUI connections)
Theory of Operation 3-9