Recently released on Berlin’s B-Hack Records is Mister Beep‘s “Monophonic Generator” album. It’s a chiptune album containing, mostly, cover versions of various songs by Kraftwerk, Tangerine Dream, Vangelis, amongst others, that is notable for being composed entirely on a Timex 2048. That one I had to look up.
The Timex 2048 was a cousin of sorts of the British favourite Sinclair ZX Spectrum. The system was mostly compatible with the “Speccy” and was most popular in Portugal and Poland, which accounts for its somewhat obscure nature. It’s also a computer that had a one channel “Beeper” for audio production. The entire album is 1-bit, which is trumped on the label site as “the first 1 bit album ever to be released on a netlabel!!!” I can’t confirm or deny that, but either way it is certainly rare.