CDC 7600 (Serial number 1) 1971 Control Data Corporation, United States The CDC 7600 was the follow on to the 6600, designed by Seymour Cray. About five times faster than the CDC 6600, scientific and government institutions primarily used both machines to execute large mathematical programs written in FORTRAN. Scientists at Lawrence Livermore National Laboratory used this machine to design nuclear weapons and, like most CDC customers, wrote much of their own software. A very large machine, the 7600 had over 120 miles of hand-wired interconnections. It was Freon cooled. Memory Type: Core Speed: 36 MFLOPS Memory Size: 512K Cost: $5,000,000 Memory Width: (60-bit)