You can use either 4MB 5 volt cards or 2mMB 5 volt cards. Most SmartMedia cards sold today are of the 3.3 volt type. 3.3 volt SmartMedia cards WILL NOT work with the following products:
MC-505
SP-202
JP-8080
XP-30
JX-305
MC-505
SP-202
JP-8080
XP-30
JX-305