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Evolution of the Harris H-series computers and speculations on their future

Harris Computer Systems, a division of Harris Corporation, arose from acquisition of Datacraft Corporation in 1974. Datacraft's first computer, the DC-6024 or Slash i, first shipped in May 1969, was designed to compete with the then rival S.E.L. (Gould Inc.) machine. Its 24-bits were an exceptional fit for floating point instructions and matched that days IC's, which came in 4-bit and 8-bit chip packages. To keep costs as low as possible, only five registers were used. The floating point formats were based on the use of two registers put together (the accumulator and extension registers) and were divided into an 8-bit exponent with sign and 39-bit mantissa with sign. The machine's main markets were scientific and engineering applications. A single CPU cycle for the Slash 1 was just 750 nanoseconds and the machine quickly became popular.