Also, an ASCII guide to gates:
output input(s) + NOT --o< |-- + -+-- OR --( ( -+-- -+-- NOR --o( ( -+-- --+-- AND --( | --+-- --+-- NAND --o( | --+-- - +-- XOR --( (( - +-- - +-- XNOR --o( (( - +--
Neat read (I never coded for Apple II):
https://en.wikipedia.org/wiki/Apple_II_graphics#High-Resolut...
Also, an ASCII guide to gates:
{C,P,N}MOS transistor implementations are exercises for the reader. :)