Casio SA-5- owned from November 2001 (?) to present, bought for $9 (or so).
The SA-5 is part of the wave of second generation Casio PCM keyboards, which all sound about the same (first generation being the ones that came out around 1986. I could be wrong about all of that but it seems to make sense to me). It's a duophonic keyboard with 32 awful-feeling tiny keys, 25 sounds, and 4 variations of each, 8 rhythm patterns, 8 accompanyment patterns, 8 "funny" patterns, and 5 demo songs. The sounds seem to be built up from two waveforms, with independent envelopes for everything. There is some fairly complex modulation in some of the sounds- arpeggiator sounds and that kind of thing. None of the patterns or demo songs are terribly interesting. Some of the sounds are pretty nice, but they all have a lot of fizzy quantization noise.
This keyboard offers lots of circuit bending potential. While it does tend to gravitate towards certain kinds of circuit bent sounds, it will often surprise me with something I've never heard- very odd non-repeating aleatoric music, etc. Unfortunately, while circuit-bending it, I ended up with intermittant shorts between some of the keyboard scanning pins. This means lots of inadvertant dissonance when playing- kind of makes it a "glitch only" keyboard. Which is fine because I hate playing the keys anyway.
pictures: post circuit bend, I used a carpet sample thing to mount the switches as there's no room on the case.
sounds:
SA-5-1- bizarre short "minimalist" demo, there's another one here
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