2.
DESCRIPTION OF CONSTRUCTION AND EQUIPMENT
The electronic desktop calculator type 220 is a fully transistorized
device. In addition to all the throat operations of the elementary
calculation, he performs extensive combination calculations and
exponentiation tasks quickly and mathematically exactly.
The machine is built according to the modular principle, so that a secure
maintenance is guaranteed.
The electronic desktop computer consists of the following modules:
Keyboard
The keyboard is arranged clearly and within reach. It is divided
in 3 key groups:
Left key group:
Numeric keypad
0-9 Digits
Decimal point dial
Lö Delete key
C Correction key
Decimal point key
Middle button group :
Function keys
#
Enter a negative number
Xn Exponentiation
X Multiplication
: Division
+ Addition
- Subtraction
= Result
Right button group:
Memory function keys
* Memory recall with deletion
▽
Memory recall without deletion
+ Memory addition
- Memory subtraction
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