GE 235 System Manual page 38

Mnemonic Operand I n e x
Time
Oper. Code Address Word Microsec.
7
Description
LMO
18 LOAD MINUS ONE into register A by setting all bit
positions to 1.
18 COMPLEMENT register A by replacing each 1 bit
with
0
and each
0
bit with 1.
18 NEGATE A by replacing the contents of register A
with the 2's complement.
12 CHANGE SIGN of register A by replacing
1
bit in sign
position with
0
and a
0
bit in sign position with 1.
NOP 18 NO OPERATION; next instruction is executed.
Arithmetic
Mnemonic Operand Index Time
Oper. Code Address Word Microsec.
-
Description
ADD
Y X
12 ADD the contents of Y and register A algebraically;
sum in A.
DAD Y
X
18 DOUBLE LENGTH ADD the contents of Y and Y+l
and registers
A
and Q algebraically; sum in
A
and Q.
18 ADD ONE (plus one) algebraically to the contents of
register A.
X 18 SUBTRACT the contents of Y algebraically from the
contents of register A.
X 30 DOUBLE LENGTH 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 algebraically from the contents of
register A.
MPY
X
54-138 MULTIPLY the contents of Y algebraically by the
contents of register Q, placing the product in re-
gisters
A
and Q.
DVD
X
156-174 DIVIDE the contents of registers A andQ algebraically
by the contents of Y, placing the quotient in A and the
remainder in Q.
IV- 13