_Add_ (10 usec.)
add x Y Operation Code 40
The new C(AC) are the sum of C(Z) and the original C(AC). The C(Z) are
unchanged. The addition is performed with 1's complement arithmetic.
If the sum exceeds the capacity of the Accumulator Register, the
overflow flip-flop will be set (see Skip Group instructions).
_Subtract_ (10 usec.)
sub x Y Operation Code 42
The new C(AC) are the original C(AC) minus the C(Z). The C(Z) are
unchanged. The subtraction is performed using 1's complement
arithmetic.
If the difference exceeds the capacity of the Accumulator, the overflow
flip-flop will be set (see Skip Group instructions).
_Multiply_ (approximately 25 usec.)
mul x Y Operation Code 54
The C(AC) are multiplied by the C(Z). The most significant digits of the
product are left in the Accumulator and the least significant digits in
the In-Out Register. The previous C(AC) are lost.
_Divide_ (approximately 90 usec.)
div x Y Operation Code 56
The Accumulator and the In-Out Register together form a 70 bit dividend.
The high order part of the dividend is in the Accumulator. The low order
part of the dividend is in the In-Out Register. The divisor is (Z).
Upon completion of the division, the quotient is in the In-Out Register.
The remainder is in the Accumulator. The sign of the remainder is the
same as the sign of the dividend. If the dividend is larger than C(Z),
the overflow flip-flop will be set and the division will not take place.