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F
I
E
L
D
Address Field
The address field begins before column 41 and after the blank which terminates the
operation field, and ends at the first blank column. It is composed of one or more sub-
fields, depending upon the instruction. Subfields, which are separated by commas on
the coding form, specify the following quantities:
m or n
word address
r or s
character address
y
operand (I5-bit)
z
operand (17-bit)
b or i
index register or interval quantity
c
character
v
register file location
ch
channel
x
function code or comparison mask
number of characters in a block
The interpretations of the address subfields for each set of instructions are described in
Table 8-l.
An m,n,r,s,y or z subfield may contain:
• A location symbol
• The symbol
**
which causes each bit in the subfield to be set to one
• The symbol
*
which causes the assembler to insert the relocatable address of
that instruction in the address field
• An integer constant
• An arithmetic expression
• A
literal
TABLE 8-1. INSTRUCTION INTERPRETATIONS
INSTRUCTION OPERATION CODES
Subfields
00-70
71 Search
72 Move
73-77 I/O
m. n
word
first word
address
-
-
address. last
word address
+
1
b
index register
-
-
-
y or z
operand
-
-
-
c
-
character
-
-
r
character
address of first
first character
first
address
character
address of
character
source field
address
s
address of last
first character
last
-
character ±·1
address of
character
receiving field
address ± 1
ch
-
-
-
channel
x
-
-
-
liD or inter-
rupt code
i
interval quantity
-
-
-
I
-
-
field length
-
8-8
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