This frequency counter is [Miguel Pedroso’s] entry in the 7400 Logic contest. After looking at the design we think this is a perfect project for those who have not worked with logic ICs before.

CMOS versions of the 7400 series subsequently became available. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires permission.

The Odyssey CPU is an 8-bit microcoded design with 16-bit address bus, using mostly 74HC-series logic. A VGA graphics card is also part of the design, which can output a 640×480 text display ...