Binary coded decimal circuit displaying up to 81 - uses only two full full adder circuits, three half adders and common gate circuit

摘要

A BCD circuit comprises half addres, full adders (3), or-gats, and -gates and NAND-gates. The main circuit uses only two dual full adders. Pref., in the input region, a three-part decade circuit provides a direct output to the number 10; another circuit converts the numbers 2 and 8 to number 10 and a further circuit converts numbers 4 and 6 to number 10. Dual 8421 code converting circuit for dual counts. USE/ADVANTAGE - Fewer components.