The RCA (CDP)1802, also known as the RCA COSMAC or COSMAC 1802, is an 8-bit CMOS microprocessor (µP) introduced by RCA in early 1976, and currently being manufactured by Intersil Corporation. The 1802 has an architecture quite different from most other 8-bit microprocessors.
COSMAC is an acronym for COmplementary Silicon Metal-oxide Conductor, which was RCA's term for its first CMOS (COS/MOS) semiconductor technology.
The RCA 1802—which is actual...
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The RCA (CDP)1802, also known as the RCA COSMAC or COSMAC 1802, is an 8-bit CMOS microprocessor (µP) introduced by RCA in early 1976, and currently being manufactured by Intersil Corporation. The 1802 has an architecture quite different from most other 8-bit microprocessors.
COSMAC is an acronym for COmplementary Silicon Metal-oxide Conductor, which was RCA's term for its first CMOS (COS/MOS) semiconductor technology.
The RCA 1802—which is actually the one-chip implementation of the earlier two-chip RCA 1801—has a static CMOS design with no minimum clock frequency, so that it can be run at very low speeds and low power. It has an 8-bit parallel bus with a bidirectional data bus and a multiplexed address bus (i.e., the high order byte of the 16-bit address and the low order byte of the address take turns in using the 8-bit physical address bus lines, by accessing the bus lines in different clock cycles). It has a single bit, programmable output port, and four input pins which are...
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