Intel 8279

The INTEL 8279 is a Keyboard/Display Controller specially developed for interfacing keyboard and display devices 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:
Keyboard section:
Display section:
Scan section:
CPU interface section:
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.
Operating modes.
The basic input modes of 8279 are
The two basic output modes are
full datasheet link:
http://www.futurlec.com/Datasheet/80Series/8279.pdf