I make chiptunes on ZX Spectrum computer since 1989. Its AY chip offers 4-bit sound, 3 channels + white noise generator, square wave and several 'buzzers'. Or 3 channels of 4-bit digital sound, but then I have to fit all samples in 48Kb of RAM. :) My other machines: Amiga 500, Amiga 1200, Atari Falcon 030, NES/Famicom, Raspberry Pi and others. The bands I founded: AY-RIDERS and also YM-DIGITAL.