Image: HP. The original HP-15C was discontinued in 1989, but HP resurrected it again in 2011 as the “HP 15c Limited Edition.” 12 years later, the calculator is now returning once again as the ...

Hewlett-Packard (HP) today announced iPhone-app versions of three classic HP calculators: the HP 12c, HP 12c Platinum, and HP 15C. When run in landscape mode, each app uses the original ROM code ...