Vortex Sound Research

I have a Casio SK-1!! Does anyone remember or know of the model number or name even of a Casio released ~1982 or so that was a calculator AND had a 1 octave keyboard AND some synthesis capabilities like the waveform changes on the SK-1. It's rather small, fits in the palm of your hand kinda thing. Forgot color scheme, prob. mostly white. No sampling function like the SK-1, it did have a 1/8" out too. {I want to be the operator of my pocket calculator! I already have a stylophone} I luv mini synth "toys", but when's the last time you've seen a fully functional sampling keyboard anyways? BTW: 12 synths & counting (I still have one channel open/left on the board!lol) I'll definitely buy it if I can find it!