Control Data 3100 Reference Manual page 159

Examples:
LOCN Op Address Field Comments
CaNST A DECO -12345. FLOATING PT CaNST
CaNST B DECO +12345 FIXED PT CaNST
CaNST C DECO -12345.0+5 FLOATING PT CaNST, DECSCALE
CaNST 0 DECO 123450-3 FIXED PT CaNST, DECSCALE
CaNST E DECO
+ 12345B+8
FIXED PT CaNST, BINSCALE
BCD
n,C1C2, ... , C4n -
inserts binary-coded decimal characters into consecutive words. If
a location term is present, it is assigned to the first word. The address field consists of
a single digit n, which specifies the number of four-character words needed to store the
BCD constant, followed by a comma and the BCD characters. The next 4n character
positions after the comma are stored. Any character string which terminates before
column 73 may be used; n is restricted accordingly.
BCD,C
n,C1C2, ... , Cn-
places n characters in the next available n character positions
in memory. If the previous instruction were also a BCD,C instruction, the next char-
acter position is defined as the one which follows the last position used by the previous
instruction. If a location symbol is used, it is assigned to the first character position in
this field. If the previous instruction were not a BCD,C instruction, the next character
position would be the first character position (0) of the next available word. Any char-
acter string which terminates before column 73 may be used; n is restricted accordingly.
VFD mlnl/vl,mm2/v2 ... ,mpnp/vp-
assigns data in continuous strings of bits rather than in
word units. Octal numbers, character codes, program locations and arithmetic values
may be assigned consecutively in memory, regardless of word breaks. The address field
consists of one or more data fields.
In each data field m specifies the mode of the data, n the number of bits allotted, and v
the value. Four modes are allowed:
o
Octal number. If it is preceded by a minus sign, the one's complement
form is stored.
H
Hollerith character code. The field length must be a multiple of six. Any
printable character may appear in the v field except blanks or commas.
Either a space or comma immediately succeeds the last character.
A
Arithmetic expression or decimal constant. The v field consists of an ex-
pression formed according to the rules for address field arithmetic, with the
following restrictions:
1.
n must be :::; 24 and
I
v
I
:::;2 n - 1
-l
unless a relocatable expression is used, in
which case, n
=
15.
2.
When a relocatable expression is used, it must be placed in the correct
position in the address portion of a word to insure that it will be relocated
by the loader.
C
Character expression. The rules governing the A-field apply, except that
n
=
17 for a relocatable expression.
The VFD address field is terminated by the first blank column.
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