Building a computer around a 6502 processor
Quote:
The first order of business in making something with the chip is to establish a clock signal. She sourced a crystal oscillator which runs at 1 MHz, but also wanted the option to single step through code. Her solution was to build two clock signals in one. A toggle switch allows her to choose the crystal, or a 555 timer circuit which uses a push button to fire each clock pulse.
http://hackaday.com/2011/11/30/building ... processor/
Nice to know that some people are still using the 6502.