ZCRSY
138
Standard 7-Bit Communication Codes
(ANSCII)_
156
ZCRBP
138
Standard Symbol-Code Correspondences
157
ZCRIO
138
Hexadecimal Arithmetic
161
ZCHLT
138
Addition Table
161
ZCRUN
139
Multiplication Table
161
Diagnostic Control Commands
139
Table of
Powers
of SixteenlO
162
pc
139
Table of
Powers
of Ten16
162
/
139
Hexadecimal-Decimal Integer Conversion
+
139
Table
163
139
Hexadecimal-Decimal Fraction Conversion
M
139
Table
169
L
140
Table of Powers of
Two
173
R
140
Mathematical Constants
173
I
140
RUB
OUT
140
B.
GLOSSARY
OF
SYMBOLIC
TERMS
174
S
140
G
141
C.
FAULT
STATUS
REGISTERS
177
X
141
Maintenance Control Commands
141
ZC
CLK
141
J6'
142
ZcC##
142
ZCE##
142
ZCKIL
142
FIGURES
ZCMMO
142
Z
C
MM1
143
l.
A Xerox 550 Computer
System
9
Z
C
MM2
143
Z
C
MM3
143
2.
The
Bas
i c Processor
10
Z
C
MM4
143
Z
C
MM5
143
3.
Information Boundaries
13
Z
C
MM6
143
Z
C
MM7
144
4.
Main Memory
15
Z
C
M
M
8
144
Z
C
MM9
144
5.
Addressing Logic
18
L~MMA
i44
ZCLDS####
144
6.
Index Displacement
AI
ignment (Real and
ZCLDT
144
Vi
rtua I Addressing Modes)
21
ZCT
144
System
Control Panel 144
7.
Generation of Actua I Addresses Indirect,
Operating Procedures and Information
147
Virtual Addressing
22
8.
Index Displacement Alignment (Real-
Extended Addressing)
23
6.
SYSTEM
CONFIGURATION CONTROL
150
9.
Generation of Effective Virtual Address
Configuration Control Panel
(CCP)
150
(Indirect Real-Extended Addressing)
24
10. Operationa I States of an Interrupt Level
31
1l.
Interrupt Priority Chain 34
12. Typical 28-Word Portion of Memory
Stack
for
PSS
and P
LS
86
APPENDIXES
13. Formats of
I/O
Instructions
111
A.
REFERENCE
TABLES
155
14. Bootstrap Loader
138
Standard
Symbo
Is
and Codes
155
15. System Control Panel
145
Standard Character Sets
155
Control Codes
155
16. Chassis Physical Configuration
151
Special Code Properties
155
Standard 8-Bit Computer Codes
(EBCDIC)
156
17.
Sample
Rows
of
CCP
Switches
151
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