Edit And Mark (Edmk) - RCA 70/46 Reference Manual

Edit and Mark
(EDMK)
General Description
Format
(55)
Condition Code
Interrupt Action
Notes
Logical
I nstruct'ions
• The variable length source field specified by the second address (BdD 2 )
is changed from packed format to zoned format and the results are edited
under control of a mask pattern. The result of the operation replaces the
mask pattern specified by the first address (BdD
1 )
and determines the
condition code. In addition, the address of each first significant result digit
is stored in General Register 1 (General Register 13 in P
3 ;
General Register
9 in P
4 ) .
The operation of this instruction is identical to the Edit instruction
except for the additional function of inserting a byte address in General
Register 1 (13 or 9). The destination address of the digit that establishes
significance within the source field being edited is loaded into the right-
most 24 bits of General Register 1 (13 or 9). The leftmost eight bits are
unaltered. The address is not loaded when significance is forced by recogni-
tion of the start significance code in the mask pattern.
The Edit and Mark instruction facilitates the insertion of floating cur-
rency symbols, sign indicators, relational operators, and other editing
symbols ($,
+, -, <, >,
etc.). The address loaded into the register is one
byte to the right of the address where such a symbol would be inserted.
(The Branch on Count instruction, with zero in the R2 field, can be used to
reduce the loaded address by one.)
Because the address is not loaded when significance is forced by the start
significance code, the address of the byte immediately to the right of the
start significance code in the mask pattern field should be loaded in General
Register 1 (13 or 9) before an Edit and Mark instruction is executed.
DF L
o
7 8 15 16 19 20 31 32 35 36
47
• 0 - indicates a zero source field whether or not significance is estab-
lished.
1 - indicates non-zero result field with significance established to indi-
ciate less than zero.
2 -
indicates non-zero result field with no significance established to
indicate greater than zero.
3-not used.
• Address error:
Addressing.
Protection.
Data error.
• 1. All notes of the Edit instruction are applicable to the Edit and Mark
instruction.
2. The address of
th8 byt8 is
loaded each
time significance is
established
and a non-zero character is inserted into the result field.
187