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