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SIO is commonly used to describe a Serial Input / Output IC. Although there are many chips that have the same title, one of the more better known ones is the Zilog Z80 series SIO, one of the family of ICs used with the Z80 processor.

Although the chipset has been superseded by more powerful and smaller ICs such as the Microchip PICs and other micro-controllers, it is still available as a replacement part and can still be found in new designs.

The serial input and output function is now a relatively simple one and dedicated SIO chips have largely been replaced with integrated controllers and larger multi-function IO devices. Current SIO ICs offer far more than a simple serial port.

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14y ago

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