Olivetti Programma 101 - Multiplication; X Instruction

x Multiplication
An instruction containing the operation " x " directs the computer to multiply the contents of
the selected register (multiplicand) by the contents of the A register (multiplier) and is
executed in two phases:
1ST PHASE
Transfer the contents of the addressed register to M, while retaining them
in the original register.
2ND PHASE Multiply the contents of M by the contents of A. obtaining in A the product
truncated according to the setting of the Decimal Wheel. The complete
product is in R. M contains the multiplicand.
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RESULTS
INSTRUCTION PHASE 1 PHASE 2 TRUNCATED COMPLETE ____________
x A x M A R
R x R  M A x M A R
A x A  M A x M A R
B x b  M A x M A R
B x B  M A x M A R
c x c  M A x M A R
e x C  M A x M A R
d x d  M A x M A R
D x D  M A x M A R
e x e  M A x M A R
E x E  M A x M A R
F x f  M A x M A R
F x F  M A x M A R
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EXAMPLE: Decimal Wheel set at 2.
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M A R B _
BEFORE 5 7.25 9.00 3.25
B x
AFTER 3.25 23.56 23.5625 3.25
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An example of using this instruction manually would, be:
Enter the multip1ier dn the keyboard and transfer to the A register by depressing "  ” 7.25 
Enter the multiplicand on the keyboard and depress the "x" key . . . . . . . . . . . . . . . . 3.25 x
The product will print automatically only when the instruction is performed manually . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.56 A 
It should be noted that the complete product is available in the R register and will be printed
by depressing the keys R  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.5625 R 
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