RCA 70/46 User Manual

Multiply Decimal
(MP)
General Description
Format
(55)
Condition Code
Interrupt Action
Notes
Decimal Arithmetic
Instructions
• The operand specified by the first address (multiplicand) is multiplied
by
the operand specified by the second address (multiplier). The product
is stored in the location of the first operand, right-justified.
The operands may be variable in length and must be in packed format.
Operands can overlap if their rightmost byte locations coincide.
The second operand (multiplier) must be shorter than the first operand
(multiplicand) and must not exceed eight bytes in length (15 digits plus
sign). Otherwise, an address error (specification) occurs.
The multiplicand
must have high-order zero bytes equal to the number
of bytes in the multiplier, field, or a data error occurs. The maximum
product size is 31 digits.
Fe
o
7 8 11 12 15 16 19 20
• Unchanged.
• Address error:
Addressing.
Protection.
S pecifica tion.
Data error.
31 32 35 36
• 1. All signs and digits are checked for validity.
2. The second
operand is unaltered unless operands overlap.
3. Overflow
cannot occur.
47
4. The sign of the product is determined by the rules of algebra, even if
one, or both, operands are zero; that is, minus zero is a possible result.
162

RCA 70/46 Specifications

General

Brand	RCA
Model	70/46
Category	Computer Hardware
Language	English