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Intel 8279

The Intel 8279 is a keyboard and display controller developed for interfacing to Intel 8085, 8086 and 8088 microprocessors. The industrial version of ID8279 was available for USD $30.70 in quantities of 100. Its important features are:Simultaneous keyboard and display operations. Scanned keyboard mode. Scanned sensor mode. 8-character keyboard FIFO. Right or left entry 16-byte display RAM. Programmable scan timing. Used for Interaction between keyboard and different microprocessor.

Interfacing of 8279 with 8085
In a microprocessor based system, when a keyboard and a 7-segment LED display are interfaced using ports or latches then the processor has to carry the following task. • Keyboard scanning • Key debouncing • Key code generation • Sending display code to LED • Display refreshing == Operating modes ==
Operating modes
The basic input modes of 8279 are • Scanned keyboard • Scanned sensor matrix • Strobed input • Display Modes The two basic output modes are • Left Entry (Typewriter type) • Right Entry (Calculator type) full datasheet link: http://www.futurlec.com/Datasheet/80Series/8279.pdf == References ==
Source: Wikipedia ↗
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