total and subtotal. The negative subtotal indicator
window
(20)
shows white whenever the
accumulator contains a negative value, even in the
middle of a longer calculation.
Example 4: 50 – 85 = -35
·
Input 50 and press add
(3)
,
·
Enter 85 and press subtract
[
-
]
(2)
·
Press the total key [
Þ
]
(4)
.
The last line printed reads 35
*
in red.
Repeat lever
When a number must be repeatedly added or
subtracted, it is possible to keep the input
mechanism from resetting. Activate the control
provided for this purpose
(9)
, moving the lever to
the left.
After entering the number you want to repeat, press
the addition or subtraction key as many times as
needed. After pressing the total key, the input
register is cleared, the ball returns to its starting
position to the right and the machine prints the
desired result.
Example 5: 125 + 250 + 250 + 250 = 875.
·
Input 125 and press the add key
(3)
·
Input 250 and move the repeat lever
(9)
to the left
·
Press the addition key
(3)
three times
·
Press the total key [
Þ
]
(4)
The machine prints the result (875 *). The repeat
control returns to its starting position, and the
position indicator
(19)
returns to zero, indicating a
clear input.
If the setting of a constant number must be
cancelled, press the clear key
(8)
(see clearing
instructions next). The input register is cleared and
the repeat lever returns to its starting position.
Multiplications can be performed manually, by
repeated additions or subtractions.
