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APPENDIX A. REFERENCE TABLES
This appendix contains the following reference material:
Title
XDS Standard Symbols and Codes
XDS Standard 8-Bit Computer Codes (EBCDIC)
XDS Standard 7-Bit Communication Codes (ANSCII)
XDS Standard Symbol-Code Correspondences
Hexadecimal Arithmetic
Addition Table
Multiplication Table
Tab I e of Powers of Si xteen 10
Table of Powers of Ten 16
Hexadecimal-Decimal Integer Conversion Table
Hexadec ima I-Dec ima I Fraction Conversion Table
Table of Powers of Two
Mathematical Constants
XDSSTANDARDSYMBOLSANDCODES
The symbol and code standards described in this publication
are opplicable to all XDS products, both hardware and soft-
ware.
They may be expanded or altered from time to time
to meet changing reqcirements.
The symbols I isted here incl ude 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 XDS Standard
Computer Code, i.e., the XDS Extended Binary-Coded-
Decima I Interchange Code (EBCDIC); (2) the 7-bit American
National Standard Code for Information Interchange (ANSCIl);
and (3) the XDS standard card code.
100
Appendix A
XDS STANDARD CHARACTER SETS
1.
EBCDIC
57-character set: uppercase letters, numerals, space,
and &
/
< > ( )
+
I
$
*
%
#
@
63-character set: same as above plus
I
--,
89-character set: same as 63-character set plus
lowercase letters
2.
ANSCII
?
64-character set: uppercase letters, numerals, space,
and
!
$
%
&
( )
*
+
,
/
\
<
> ?
@
[ ]
/'\.
#
95-character set: same as above plus lowercase letters
and {
}
CONTROL CODES
In addition to the standard character sets listed above, the
XDS symbol repertoire includes 37 control codes and the
hybrid code DEL (hybrid code SP is considered part of all
character sets).
These are I isted in the table titled XDS
Standard Symbol-Code Correspondences.
SPECIAL CODE PROPERTIES
The following two properties of all XD S standard codes wi
/I
be retained for future standard code extensions:
1.
All control codes, and only the control codes, have
their two high-order bits equal to "00".
DEL is not
considered a control code.
2.
No two graphic EBCDIC codes have their seven low-
order bi ts equa I.
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