The GFDL Ocean Model started as a three dimensional primitive equation model based on the pioneering work of Kirk Bryan (1969). Early Fortran implementations of Bryan's ideas were carried out chiefly by Mike Cox in Washington, D.C. during the late 1960's on an IBM 70301/stretch and then a CDC 6600 computer. After GFDL moved to Forrestal Campus of Princeton University, Cox continued developments by constructing a global model in 1968 on a UNIVAC 1108. Bert Semtner2.1 converted that model to execute on Princeton University's IBM 360/91 in 1970 and both codes were in use through 1973 with Semtner's version surviving for use on an interim IBM 360/195 in 1974. While at GFDL and UCLA, Semtner (1974) rewrote the model to take advantage of the instruction stack on the IBM 360/195 and also with future vector architectures in mind. The first vector machine arrived at GFDL in 1975. It was a four pipeline Texas Instrument ASC (acronym for Advanced Scientific Computer) and the model of Semtner (1974) was used as the starting point for further conversion efforts by Cox and Pacanowski. After the ASC, Cox abandoned the ASC version of the model in favor of Semtner's latest version and optimized it for the CDC Cyber 205 which required very long vector lengths for efficiency. Actually, the Cyber 205 experience involved two Cyber 205's and a Cyber 170 front end delivered to GFDL in stages between 1982 and 1983. It was the resulting ``Cyberized'' version of the model that was distributed as the Cox (1984) ocean model code. Over the lifetime of the Cyber system, Cox installed other features such as variable horizontal resolution, multiple tracers, and isopycnal mixing until his untimely death in 1989. The Cox code entailed about 5000 lines of fortran code.