APPENDIX
A.
REFERENCE
TABLES
This
appendix
contains the following
reference
material:
Title
Standard
Symbo
Is
and Codes
Standard
8-Bit
Computer Codes (EBCDIC)
Standard
7-Bit
Communication Codes (ANSCII)
Standard Symbol-Code Correspondences
Hexadecimal Arithmetic
Addition Table
Multiplication
Table
Table
of
Powers
of
Sixteen
10
Table
of
Powers of Ten16
Hexadecimal-Decimal
Integer
Conversion Table
Hexadecimal-Decimal Fraction Conversion Table
Table
of
Powers
of
Two
Mathematical Constants
STANDARD
SYMBOLS
AND
CODES
The symbol and
code
standards described in this publ
ication
are
applicable
to
all
Xerox computer products, both
hard-
ware
and
software. They may be expanded or
altered
from
time to time to meet changing requirements.
The symbols listed here
include
two types: graphic symbols
and
control
characters.
Graphic
symbols
are
displayable
and
printable;
control
characters
are
not. Hybrids
are
SP,
the
symbol for a blank
space;
and
DEL,
the
delete
code,
which
is
not considered a control command.
Three types
of
code
are
shown:
(1)
the
8-bit
Xerox Standard
Computer Code,
i.e.,
the Extended Binary-Coded-Decimal
Interchange Code (EBCDIC);
(2)
the
7-bit
American
National
Standard Code for Information Interchange (ANSCII);
and
(3) the Xerox standard card
code.
STANDARD
CHARACTER
SETS
1.
EBCDIC
57-character
set:
uppercase
letters,
numerals,
space,
and
& / < > ( ) + I $ *
% # @
63-character
set:
same as above plus i
II
89-character
set:
same
as
63-character
set
pi
us
I
owercasel
etters
2.
ANSCII
?
64-character
set:
uppercase letters, numerals,
space,
and
"!
$ % &
()
* + ,
/ \ <
>?
@
[]
A #
95-character
set:
same as
above
plus lowercase
letters
and
{ }
CONTROL
CODES
In
addition
to
the
standard
character
sets I isted
above,
the
symbol repertoire includes 37 control codes
and
the hybrid
code
DEi..
(hybrid
code
SP
is
considered
part
of
aii
charac-
ter
sets). These
are
I isted in
the
table
titled
Standard
Symbo
I-Code
Correspondences.
SPECIAL
CODE
PROPERTIES
The following two properties of
all
standard codes
wi"
be
retained
for future standard code extensions:
1.
All control codes,
and
onl y the control codes, have
their
two
high-order
bits equal to
1100".
DEL
is
not
considered a control
code.
2.
No
two graphic
EBCDIC
codes have their seven low-
order bits
equal.
Appendix A 173
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