Similar Chips
This chip is used to give the CPU access to programmable parallel I/O, and is similar to other such chips like the MOS Technology 6522 (Versatile Interface Adapter) and the MOS Technology CIA (Complex Interface Adapter) all developed for the 6502 family. Other such chips are the 2655 Programmable Peripheral Interface from the Signetics 2650 family of microprocessors, the Motorola 6820 PIA (Peripheral Interface Adapter) from the Motorola 6800 family, the Western Design Center WDC 65C21, an enhanced 6520, and many others.
However, most often the functionality 8255 offered is now not implemented with the 8255 chip itself any more, but is embedded in a larger VLSI chip as a subfunction. The 8255 chip itself is still made, and is sometimes used together with a micro controller to expand its I/O capabilities.
Read more about this topic: Intel 8255
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