Xerox 550 User Manual

CONTENTS
l. XEROX 550 COMPUTER SYSTEM
Instruction Exception Trap
43
Power On Trap 44
Introduct i on
1
Power Off Trap 44
General Characteristics
1
Processor Detected Fau I t Flag 44
Standard and Opti ona I Features
3
Register
Altered Bit 45
Genera 1- Purpose Fea tures
3
Time-Sharing Features
4
Rea
1- Time Features
5
Multiuse Features
6
3. INSTRUCTION REPERTOIRE 46
Multiprocessor Features
6
Multiprocessor Interlock
6
Load/Store Instructions 48
Multiport Memory System
7
LI
49
Manual Partitioning Capability
7
LB
49
Multiprocessor Control Function 7
LH
49
Shared Input/Output
7
LW
49
LD
50
LCH
50
LAH
50
2. SYSTEM ORGANIZATION
8
LCW
51
LAW
51
Processor C I us ters 8
LCD
51
System Control Processor 8
LAD
52
Basic Processor 8
LAS
52
General Registers 8
LS
53
Memory Control Storage
11
LM
53
Computer Modes
11
LCFI
53
Information Format
12
LCF
54
Information Boundaries
13
LVAW
54
Instruction Register
13 XW
54
Main Memory
14
STB
54
Memory Unit
14
STH
55
Maintainability and Performance
16 STW
55
Virtual and Real Memory
17
STD
55
Types of Addressing
19
STS
55
Memory Address Control
26
STM
55
Program Status Words 28 STCF
56
Centra I ized Interrupts 30
Ana Iyze/Interpret Instructions
56
States of an Interrupt Level
30
ANLZ
56
Dialogue Between the Basic Processor and
INT
58
the Interrupt System During an Interrupt-
Fixed-Point Arithmetic Instructions
58
Entering Sequence
32 AI
59
Dialogue During an Interrupt-Exiting AH
59
Sequence
32
AW
60
Physical Organization
32 AD
60
Interrupt Groups
32
SH
61
Control of the Interrupt System 35 SW
61
Single-Instruction Interrupts 36 SD
61
Trap System
36 MI
62
Trap Entry Sequence
36
MH
62
Trap Addressing 36 MW
63
Trap Condition Code
39
DH
63
Nonallowed Operation Trap 39 DW
63
Push-Down Stack Limit Trap
40
AWM
64
Fixed-Point Overflow Trap
41
MTB
64
Floating-Point Arithmetic Fault Trap
42
MTH
64
Watchdog Timer Runout Trap
42
MTW
65
Programmed Trap
43
Comparison Instructions
65
CALL Instruction Trap
43 CI
66
Hardware Error Trap
43 CB
66
iii

Xerox 550 Specifications

General

Brand	Xerox
Model	550
Category	Printer
Language	English