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Subtraction
An instruction containing the operation "
the selected
register (subtrahend) from the contents of the A register (minuend) and is
executed in two phaaes:
1ST PHASE
2ND PHASE
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INSTRUCTION
PHASE 1
R-
A-
b -
B-
c -
C-
d -
D-
e -
E-
f -
F -
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EXAMPLE:
Decimal Wheel set at 2.
______________________________________
M
BEFORE
5
B-
AFTER
3.255
___________________________________________________________________________
An example of using this Instruction manually to subtract 2 factors would be (assume factor 1
(7.2567) is in the b (B/) register and factor 2 (3.255) is in the B register):
Transfer factor 1 to the A register by depressing keys B/
Subtract the second factor by depressing keys B- . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Print the difference by depressing A
For this example the Decimal Wheel was set at 4.
Transfer the contents of the selected register (subtrahend) to II, while
ratalnlng them In the original register.
Subtract the contents of M from the contents of A (minuend) obtaining in
A the difference truncated according to the setting of the Decima/ Wheel.
The complete difference is in R. M contains the subtrahend.
PHASE 2
A-M
R
M
A-M
A
M
A-M
b
M
A-M
B
M
A-M
c
M
A-M
C
M
A-M
d
M
A-M
D
M
A-M
e
M
A-M
E
M
A-M
f
M
A-M
F
M
A-M
A
R
7.2567
9.00
4.00
4.0017
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" directs the computer to subtract the contents of
RESULTS
TRUNCATED
A
A
A
A
A
A
A
A
A
A
A
A
A
B
_
3.255
3.255
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.0017 A
- 25 -
COMPLETE
____________
R
R
R
R
R
R
R
R
R
R
R
R
R
. . . . . . . . . . . . . . . . . . . . .
b
B -
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