This capability matched that of the competing Z80, a popular 8080-derived CPU introduced the year before. The "5" in the part number highlighted the fact that the 8085 uses a single +5- volt (V) power supply by using depletion-mode transistors, rather than requiring the +5 V, −5 V and +12 V supplies needed by the 8080. However, it requires less support circuitry, allowing simpler and less expensive microcomputer systems to be built. It is software- binary compatible with the more-famous Intel 8080 with only two minor instructions added to support its added interrupt and serial input/output features. The Intel 8085 (" eighty-eighty-five") is an 8-bit microprocessor produced by Intel and introduced in March 1976.
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