GE 235 System Manual page 39

OPTIONAL DECIMAL ARITHMETIC
Mnemonic Operand Index Time
Oper. Code
Address Word Microsec.
-
Description
SET BINMODE
12
SET BINARY MODE, permitting arithmetic instruc-
tions to operate in the binary mode a s detailed above.
(When power is turned on, the computer will be set
automatically in the binary mode.)
SET
ADD
DAD
ADO
SUB
DSU
SBO
DECMODE
Y
Y
12 SET DECIMAL MODE, permitting arithmetic instruc-
tions to operate in the decimal mode a s detailed below.
X 12 DECIMAL ADD the contents of Y and register A
algebraically; sum in A.
X
18 DOUBLE DECIMAL ADD the contents of Y and
Y+l
and registers A and Q algebraically; sum in A and Q.
18
ADD ONE DECIMAL (plus one) algebraically to the
contents of register A.
X 18 DECIMAL SUBTRACT the contents of Y algebraically
from the contents of register A.
X 30 DOUBLE DECIMAL SUBTRACT the contents of Y
and Y+l algebraically from the contents of registers
A and Q; result in A and Q.
18
SUBTRACT ONE DECIMAL algebraically from the
contents of register A.
Shift
The shift instructions shift the contents of register A to the right o r left serially either alone o r
with the contents of the N and/or Q registers. Twelve microseconds a r e required for a shift of
two bit positions o r less; six additional microseconds a r e required for each additional 3-bit shift
o r fraction thereof.
Mnemonic Operand Index
T i m
Oper. Code Address
Word Microsec.
-
SRA
SRD
SLA
Description
K X
12+
SHIFT RIGHT A. The contents of register A a r e
shifted right K places.
K
X
12+ SHIFT RIGHT DOUBLE. The contents of registers A
and Q together a r e shifted right
K places, with bits
shifting out of A into Q.
K X 12+ SHIFT LEFT A. The contents of register A a r e
shifted left K places.