![]() ![]() The major differences were in such areas as an on-chip oscillator, power-on reset, vectored interrupts, decoded control lines, a serial I/O port, and a single power supply. The 8085 turned out to be architecturally not much more than a repackaging of the 8080. This meant that the only extension to the instruction set could be in the twelve unused opcodes of the 8080. The new processor, called the 8085, was constrained to be compatible with the 8080 at the machine-code level. ![]() The objective was to come out with a processor set utilizing a single power supply and requiring fewer chips (the 8080 required a separate oscillator chip and system controller chip to make it usable). In 1976, technology advances allowed Intel to consider enhancing its 8080. ![]()
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