Operating Procedure.6 - Heath HEATHKIT IC-2009 Operation Manual

OPERATING PROCEDURE
Charts 1 through 4, which follow, illustrate the four basic functions of the
Calculator: ADDITION, SUBTRACTION, MULTIPLICATION, and DIVISION.
Chart 5 shows mixed calculations; Charts 6 and 7 show multiplication and
division by a constant; Charts 8 and 9 show how to calculate positive and
negative powers of numbers; Chart 10 shows the use of the (CE) CLEAR
ENTRY.
Each numbered step (line) of the Charts shows which input and function keys to
push, and what the readout will be. In the "Display" column, the light lines
represent all the segments that can light whereas the heavy lines indicate the
segments to be lighted for that step.
Until you become familiar with using the Calculator, it will be helpful to refer tc
these charts from time to time.
Connect the charger into an appropriate AC power source and connect the
charger cord into the Calculator The Calculator can be used for desk top
operation even with the Charger connected. It will take approximately 14 hours
(with the Calculator turned off) before the batteries are completely charged. The
Calculator, when used as a portable, can be expected to operate for
approximately five hours when starting with a fully charged battery. {No
warmup time is required to use the Calculator.)
Before you begin any calculation, always push the (C) CLEAR key to clear the
Calculator.