187-055-201-A__Wicat_System_150_mapped_Hardware_Reference_Manual_Jul82.pdf

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TN I CAT
System 150
(mapped)
Hardware Reference Manual
July 1982
WICAT SYSTEMS INCORPORATED
Orem, Utah
187-055-201 A
Copyright Statement
Copyright (c) 1982 by WICAT Systems Incorporated
All Rights Reserved
Printed in the United States of America
Receipt of this manual must not be construed as any kind of
commitment, on the part of WICAT Systems Incorporated, regarding
delivery or ownership of items manufactured by WICAT.
This manual is subject to change without notice.
A system software
subscription entitles you to receive all bulletins and revised
editions of manuals pertaining to your WICAT system.
Call WICAT
Systems's main office for information on this service.
WARNING:
The equipment described in this manual generates, uses,
and can radiate radio frequency energy, and if not installed
in accordance with instructions provided in the hardware
documentation for the equipment, may interfere with radio
communications.
Furthermore, the equipment has been tested
and found to comply with the limits for a Class A computing
device pursuant to subpart J, Part 15 of FCC rules, which
are designed to provide reasonable protection against such
interference when the equipment is operated in a commercial
environment. Operation of the equipment (described in this
manual)
in
a
residential
area is likely to cause
interference.
Where the equipment will be used in a
residential area, it is the user's responsibility to ensure
that any interference is corrected.
Revision History
First Printing
July 1982
The Purpose of This Manual
This document provides the technical information users will need
should they want to modify System 150 (mapped) PC boards to interface
with peripheral devices that are not supplied by WICAT Systems Inc.
Furthermore,
difficulties
WICAT.
assumes no responsibility
for
WI CAT Systems Inc.
arising from the use of equipment not manufactured by
Intended Audience
Field service technicians,
OEM
representatives, and
maintenance
personnel on Systems 150 (mapped). Readers must be knowledgable in
electronics, and familiar with the basic terminology of computer
science.
CHAPTER 1
1.1
1.2
1.3
1.4
1.5
1.5.1
1.5.2
1.6
1.6.1
1.6.2
1.6.3
1.6.4
1.6.5
1.6.5.1
1.6.5.2
1.6.5.3
1.6.5.4
1.6.5.5
1.6.5.6
CHAPTER 2
2.1
2.2
2.3
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2.4
2.4.1
2.4.2
2.4.3
2.4.3.1
SYSTEM OVERVIEW
INTRODUCTION •
DEFINITION AND FEATURES
SYSTEM CONFIGURATION •
BOARD CONFIGURATION
BOARD INTERACTION
Explanation Of Bus Structure •
Bus Control
SYSTEM DATA FLOW
Central Processing Unit (CPU)
Memory •
CRT
Storage
Peripherals
Serial Interfaces
Parallel Interface •
Battery-backed Clock •
Graphics Circuitry (Optional)
Videodisc Controller (Optional)
IEEE 488 Interface (Optional)
•
•
•
•
•
•
•
•
•
•
•
•
•
1-1
1-1
1-1
1-4
1-6
1-6
1-6
1-6
1-9
1-9
1-9
1-9
1-9
1-10
1-10
1-10
1-10
1-10
1-11
...
..
.
.
CPU BOARD
•
•
•
•
•
•
•
•
•
2-1
2-1
2-1
2-4
2-4
2-5
2-5
2-8
2-8
2-10
2-10
2-11
2-11
2-12
2-12
2-13
2-13
2-13
2-14
2-17
2-19
2-19
2-21
2-22
2-22
2-22
INTRODUCTION •
DEFINITION AND FEATURES
CPU BOARD CONFIGURATION
The MULTIBUS Interface •
On Board ROM •
Interrupt Circuitry
Bus Arbitration Circuitry
Memory Mapping Registers •
PROCESSOR CIRCUITRY
Address Bus
Data Bus •
Synchronous Bus Control
Command Lines (MRDC/, MWTC/, IOWC/, And
IORC/) •
Transfer Acknowledge Line (XACK/)
2.4 • .3.2
2.4.4
MG68000 Bus Control
Bus Arbitration Control
2.4.5
2.4.5.1
Single Device Arbitration
2.4.5.2
Multi-Device Arbitration •
2.4.6
Interrupt Control
• •
System Control •
2.4.7
2.4.8
MC68000 Peripheral Control •
2.4.9
Processor Status •
2.5
MEMORY MAP • • •
ERROR CONTROL
2.6
2.6.1
Address Errors •
2.6.2
The Error Register •
..
..
..
.
.
..
.
.
..
v

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