on the 1981 song Pocket Calculator by electronic music group Kraftwerk. References External links FX-501P and FX-502P on casio.ledudu.com maintained by ledudu. FX-502P Geek hosted by casio.ledudu.com FX-501P and FX-502P on RS-Key maintained by Viktor Toth. Casio FX-501P and Casio FX-502P on Voidware FX-502P Simulator FX-502P Products introduced in 1978