Xerox 560 Reference Manual

CONTENTS
1.
XEROX 560 COMPUTER SYSTEM
Hardware Error Trap
43
Instruction Exception Trap
44
Introduction
1
Power
On Trap
44
General Characteristics
1 Power Off Trap 44
Standard and Optional Features
3
Processor
Detected Fault Flag 44
General- Purpose Features
3
Register
Altered Bit 45
Time-Sharing Features
4
Real- Time Features
5
Multiuse Features
6
Multiprocessor Features
6
Multiprocessor Interlock
6 3.
INSTRUCTION REPERTOIRE 47
Multiport Memory System
7
Manual Partitioning Capability
7
Load/Store Instructions 49
Multiprocessor Control Function 7
Analyze/Interpret Instructions 57
Shared Input/Output
7
Fixed-Point Arithmetic Instructions
59
Comparison Instructions
66
Logical Instructions 69
Shift Instructions
70
2.
SYSTEM ORGANIZATION
8
Floating-Point Shift
72
Conversion Instructions
73
Processor Clusters 8
Floating-Point Arithmetic Instructions
74
System Control Processor
8
Floating-Point Numbers
75
Bas i c Processor 8
Floating-Point Add and Subtract
76
General Registers 8
Floating-Point Multiply and Divide
78
Memory Control Storage 11
Condition Codes for Floating-Point
Computer Modes 11
Instructions
78
Information Format
12
Decimal Instructions
80
Information Boundaries
13
Packed Decima I Numbers 81
Instruction Register 13
Zoned Decimal Numbers
81
Main Memory
14
Decimal Accumulator 81
A A _______
I 1 __ ~ L
,4
Decimai instruction format ~I
IVIO;::IIIVIY Villi
Maintainability and Performance 16
Illegal Digit and Sign Detection 81
Virtual and Real Memory 17 Overflow Detection 82
Types of Addressing 19 Decimal Instruction Nomenclature 82
Memory Address Control
26 Condition Code Settings 82
Program Status Words 28 Byte-String Instructions 86
Centralized Interrupts
.30
Push-Down Instructions (Non-Privileged)
96
States of an Interrupt Level
30
Stack Pointer Doubleword (SPD) 96
Dialogue Between the Basic Processor and Push-Down Condition Code Settings
97
the Interrupt System During an Push-Down Instructions (Privi leged) 101
Interrupt-Entering Sequence 32 Status Stack Pointer Doubleword
101
Dialogue During an Interrupt-Exiting Execute/Branch Instructions 106
Sequence
32 Nonallowed Operation Trap During
Physical
Organization
32
Execution of Branch Instruction 106
Interrupt Groups
32
Call Instructions 109
Control of the Interrupt System 35 Control Instructions
109
Sing I e- Instruct i on Interrupts
36 Loading
the Memory Map
114
Trap
System
36
Memory Write Protection Locks 116
Trap Entry
Sequence
36 Interruption of MMC
117
Trap Addressing
36
Memory Access Traps by MMC Instruction __ 117
Trap
Condition Code 39 Read Direct, Internal Basic Processor
Nonallowed Operation Trap
39
Control (Mode 0) 120
Push- Down Stack Limit Trap 41
Read Direct, Interrupt Control (Mode 1) __ 121
Fixed-Point Overflow Trap 41 Read Direct (Mode 9)
123
Floating-Point Arithmetic Fault Trap 42 Write Direct, Internal Basic Processor
Decimal
Arithmetic Fault Trap
42 Control (Mode 0) 123
Watchdog Timer Runout Trap
43
Input/Output Instructions
127
Programmed Trap
43
Overa" Characteristics
127
Call Instruction Trap
43 I/O Status Information
127
iii

Xerox 560 Specifications

General

Brand	Xerox
Model	560
Category	Printer
Language	English