Interface
The FX-601P and FX-602P used the same FA-1 interface as used by the FX-502P line of calculators or alternatively the newer FA-2 interface which was also used by Casio FX-702P. Both interfaces featured a Kansas City standard Compact Cassette interface. The FA-2 featured an additional printer port for the FP-10 Thermal printer.
Read more about this topic: Casio FX-602P Series