Control Data 3100 Reference Manual page 105

TRAPPED INSTRUCTIONS IF BCD ARITHMETIC OPTION IS NOT PRESENT
23
18 17 16
00
LOE Load ED
(Approximate execution time: 10.8 tJ,sec.)
option present.
Rev. 8
64
I
:16 02 01 00:
I
00000-77777
I
0-3
I
~~-----y~----~/'-y-/
word character position
address within the word
If b =
1.
r is modified by
(8
1 ); R=r
+
(8
1 ).
If b = 0, r is the unmodified direct address.
Instruction Description: Load the En register with a maximum field of 12 numeric BCD char-
acters from storage.
Comments: Characters are loaded consecutively, starting with the least significant character
(LSC) at address R
+
(D-l) and continuing until the most significant character at address R is in
En. (En) is shifted right as loading progresses. The sign of the decimal operand is acquired
along with the LSC. Prior to executing this instruction, the field length must be specified with a
SET (70.7) instruction. The (ED) and always right justified, i.e., the lowest significant digit of
the operand is always in the digit zero position.
Refer to the BCD section of Appendix B for an LDE instruction execution example.
NOTE
Since the sign of Bb is extended during character address modification, it is possi-
ble to reference only within
± 16,38310
characters.
23 18 17 16
65
I
b
I
If b= 1, r is modified by the
(8
2 ); R=r
+
(8
2 )
If b= 0, r is the unmodified
direct address (r = R).
00
(Approximate execution time: 10.8 tJ,sec.)
option present.
Instruction Description: Store a maximum field of
13
numeric BCD characters from the ED
register into storage.
Comments: Characters are stored, beginning with the least significant character (LSC)
and the sign of the stored operand is acquired with this character. (ED) is shifted right as
the Store operation progresses, end off, until the entire field of characters is stored.
Prior to executing this instruction the field length must be specified with a SET (70.7)
instruction.
NOTE
Since the sign of Bb is extended during character address modification, it is possi-
ble to reference only within
± 16,38310
characters.
7-48