- Published in issue 9/1999 on page 0
Hexadecimal keypad for PCs:
problem–free programming

Many computers and microcontrollers are programmed
in hexadecimal, which represents numerical values
using the numerals 0 through 9 plus the letters A through
F. Entering the numerals is quite easy with the numeric
keypad of a PC keyboard, but the letters are scattered
over the entire alphanumeric portion of the keyboard.
This article describes the construction of a keypad with
20 buttons, which includes all the necessary characters
as well as several control characters.