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8-Bit I/O Devices Still Alive But Crippled

Intel produced a family of 8-bit I/O devices to support its early 8-bit microprocessors and my “MCS-85 User's Manual” documents the existence of these products in January 1978–30 years ago! I used the ...
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8-Bit I/O Expander with SPI Interface

The MCP23S08 is an 8-bit I/O expander with serial interface. This device offers 8-bit, general purpose, parallel I/O expansion for SPI applications. It has two hardware address pins and uses SPI ...