Programming with the Radio Shack EC-4004

[damaltor]

Actually, the EC-4004 is a radio shack labeled device made by casio, specifically a casio fx-3500p. I have one if i remember correctly.

Most (all?) radio shack calculators were made by casio that time, and actually were sold parallel to the casio devices. Apart from the print on the housing, the devices are completely identical and had no inner modifications.

more about the 3500p:
http://casio.ledudu.com/pockets.asp?type=248&lg=eng