The MOS Technology 6502 is, by today's standards, an ancient chip, having just turned 50 this September 8. It was the chip behind the early age of home computing, powering iconic systems like the Apple I & II, Commodore 64, Atari, and Nintendo Entertainment System. It is, therefore, fascinating that someone has managed to use this chip as a core component in a modern software-defined radio system. Over on his blog, Anders B Nielsen describes PhaseLoom, a 6502-based 'Quadrature Sampling Detector Phase-Locked Loop SDR frontend'. Realistically, we want to point out that the 6502 isn't actually doing any digital signal