Monroe 8125 User Manual page 137

controls must be located on the right of the
numeric keypad.
The largest keys on the keyboard should be
this certainly means the Plus Key, Minus
Key, Total Key, Zero Key and Decimal Key.
The actual size of these keys varies greatly
from model to model and it is often what one
becomes comfortable with that determines
what size is large enough. Small Keys,
especially those used often, hinder touch
operation and therefore productivity.
The shape of keys often enhances touch
operation. For example, the numeric keypad (1
-9) on the 8125 has cupped keys. The function
to differentiate between the numeric keypad
and the function keys by feel. The 5 key has a
tiny dome in its center, much like a computer
locating the home key (5) and home row (4, 5
and 6).
Keys with little side to side play enhance touch
operation by providing a surety of touch.
Excessive play on the key top or pressing key
tops in locations that prohibit entry slow down
or eliminate the ability to operate the calculator
Two key rollover enhances speed in touch
operation. For example, if entering the amount
12 the user may press the 1 key followed by
depression of the 2 key. Both keys are pressed.
causes both 1 and 2 to be entered. The fastest
touch operators roll from the entry of keys to
a function key. Two key rollover eliminates the
need for pressing each key distinctly one key
at a time.
In the event two keys are pressed
calculator will be entered. Normally it will be
the key pressed with the greatest force. By not
creating an Error (which on many calculators
Interlocks tries to interpret the entry and
choose the most likely correct key depression.
Decimal Settings
Every calculator has one or more decimal
settings. The decimal setting controls the
number of decimal places desired in the total
or result. The decimal selector should never
contained in an entry as its function is to
determine the number of entries in the total
or result. If a calculator edits the number of
decimal places in an entry to the decimal
setting, it is violating the precept that between
the operator and the calculator, the only
intelligent entity is the operator. If the calculator
edits entries, an operator would need to move
the greatest number of decimal places to
decimal selector back to the desired number of
decimal places in the answer before pressing
the total key. That's both additional manual and
mental effort.
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