In 1974, RMI produced the "Keyboard Computer". It was derived from the digital Allen Computer Organ, with fewer voices, and was marketed as the world's first portable digital musical instrument. It cost $4,495 and supported transposition, pitch bend, and upgradeable voices via a series of punch cards. It was possible for the end user to store their own patches on punch cards. Though marketed as a synthesizer, the Keyboard Computer was based more on organ technology and did not have the full set of synthesizer functions. The Keyboard Computer II was introduced in 1977. It cost $4,750 and featured an improved user interface, an increased range of voices, and allowed users to store more patches.