CDP1851, CDP1851C March 1997 CMOS Programmable I/O Interface Description THE CDP1851 and CDP1851C are CMOS programmable twoport I/Os designed for use as general-purpose I/O devices.
They are directly compatible with CDP1800-series microprocessors functioning at maximum clock frequency.
Each port can be programmed in either byte-I/O or bit-programmable modes for interfacing with peripheral devices such as printers and keyboards.
Both ports A and B can be separately programmed to be 8-bit input or output ports with handshaking control lines, RDY and STROBE.
Only port A can be programmed to be a bidirectional port.
This configuration provides a means for communicating with a peripheral device o...

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