CDC 1604 a 48-bit computer manufactured by the Control Data Corporation. The 1604 is known as the first commercially successful transistorized computer. The first machine was delivered to the US Navy in 1960 for applications supporting major Fleet Operations Control Centers in Hawaii, London, and Norfolk, Virginia. By 1964, over 50 systems were built. The CDC-3600 succeeded the 1604.

The 1604 designation was chosen by adding CDCs first street address (501) to Cray's former project, the 1103. A 12-bit cut-down version was also released as the CDC 160A in 1960, arguably the first minicomputer.

NAVCOSSACT based at the Washington Navy Yard provided systems and training support. JOVIAL was used as the CDC 1604's main programming language while octal was used to program shared services supported by the CDC 160A.

During 1969, Fleet Operations Control Center, Pacific (FOCCPAC at Kunia) on Oahu in Hawaii launched an Automated Control Environment (ACE) using a cluster of five (5) CDC 160As to supervise a multi-tasking network of four (4) CDC 1604's.

The third version of the PLATO computer-based educational system was implemented on a CDC-1604.

CDC hardware | Mainframe computers