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The 8243 core is the HDL model of the Intel™ 8243 input/output expander
8243 Features
Functionally based on the Intel 8243 device Five 4-bit peripheral ports: P20, P40, P50, P60, P70 Two control signals: CS, PROG Four programming modes for peripherals (three write and read modes) 4-bit bidirectional system data bus with standard microprocessor interface controls