Intel 8085 microprocessor is the next generation of
Intel 8080 CPU family. In addition to
being faster than the 8080, the 8085 had the following enhancements:
- Intel 8085 had single 5 Volt power supply.
- Clock oscillator and system controller were integrated on the chip.
- The CPU included serial I/O port.
- Two new instructions were added to 8085 instruction set. The CPU
also included a few undocumented instructions. These instructions
were supposed to be a part of the CPU instruction set, but at the
last moment they were left undocumented because they were not
compatible with forthcoming Intel 8086.
- Full list of differences between Intel
8080 and 8085 processors.
There were multiple versions of 8085 microprocessors.
The original version of the 8085 microprocessor without suffix "A"
was manufactured by Intel only, and was very quickly replaced with
8085A containing bug fixes. A few years after that, around 1980,
Intel introduced 8085AH - HMOS version of 8085A. There was also
80C85A - CMOS version of the 8085A. It's not clear if 80C85 was ever
manufactured by Intel or not, but it was produced by at least two
second source manufacturers - OKI and Tundra Semiconductor. Tundra
Semiconductor manufactured the fastest 8085 microprocessor running at
8 MHz.
Second source manufacturers: AMD, Mitsubishi, NEC, OKI, Siemens,
Toshiba. Soviet Union also manufactured clones of Intel 8085 CPU.
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