Analog Industries is leading an exciting revival of the SpecDrum - a £29 hardware sampled drum machine that interfaced with the Sinclair ZX Spectrum, and used 8 bit (or, according to some reports, 3 bit) samples. I had one at the time, and samefully, I only remember getting bored of it very quickly. Listening to it now, it sounds like a lofi Linn, with a reasonably workable programming system that looks a bit like Fairlight's Page R (complete with 'Peow' sound). Analog Industries have links to Spectrum Emulators, the original files, and various kits, loops and tracks made with the thing. Next up: The Currah µSpeech Spectrum Speech synthesizer, which is also available on emulators.
UPDATE: On a similar, but even cooler note, Matrix Synth has found a Moog Song Producer, which interfaces with a Commodore 64 (That's right, 'Moog' and 'Commodore 64' in the same sentence) on eBay. It's item #8713927196.