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This section describes the mode switches, data entry keys, and operating keys provided on
your calculator. The following terms are used in discussing your calculator’s operation:
• The accumulator is the area of the calculator’s logic that stores a running total of the
results of addition and subtraction operations. It is the “adding machine” portion of the
calculator.
• The calculating register is the area of the calculator’s logic where the intermediate and
final results of multiplication, division and percentage calculations are stored. The
contents of the calculating register do not affect the accumulator.
• The keyboard register is the area of the calculators logic that stores the value that will
immediately be used in the next calculation.
• The item count register is the area of the calculator’s logic that counts your entries into
the accumulator. Each positive or negative entry is counted as one item..
• The memory register is the area of the calculator’s logic that accumulates amounts you
add to or subtract from the memory. Because the memory register is independent of the
accumulator and the calculating register, it retains its value until you clear it with the
Memory Total (MT) key.
KEY and SLIDE SWITCH FEATURES
This section illustrates and describes the mode switches you can use to control your calculator’s
operation.
1. [↑↑] Paper Feed Key
Advance the paper roll.
2. [→→] Right Shift Key
Deletes right most character of a live entry.
3. [RATE] TAX Rate Preset Key
Used to enter TAX rate.
4. •• ∑∑ Sigma Switch
∑∑ When the Sigma switch is in the “∑∑” position, the results of multiplication or
division calculations completed by the = or % key are automatically added
to the accumulator.
•• When the Sigma switch is in this position, the results of these calculations
are not added to the accumulator. The sum of these accumulations is
displayed by depressing the Subtotal key and is displayed and cleared by
depressing the Total key.