18 Facts About RCA 1802

RCA 1802 began development of the CMOS version of the processor design in 1973, sampling it in 1974 with plans to move to a single-chip implementation immediately.

RCA 1802 produced radiation hardened versions using a silicon on sapphire process, which found use in the aerospace field.

Successors to the RCA 1802 are the CDP1804, CDP1805, and CDP1806, which have an extended instruction set, other enhanced features, with some versions running at faster clock speeds, though not a significant speed difference.

When RCA 1802 entered the game console business in the later 1970s, these games were burned to ROM cartridge form, and Joyce became the first known female commercial videogame developer.

RCA 1802 debated whether to introduce pre-packaged versions of the ELF to the market.

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The RCA 1802 ran the Galileo probe to Jupiter in 1989, and it remains in use in similar roles to this day.

Infinite Incorporated produced an RCA 1802-based, S-100 bus expandable console computer trainer in the late 1970s called the UC1800, available assembled or in kit form.

The radiation hardened 1802 version was manufactured at Sandia National Laboratories in agreement with RCA.

RCA 1802 was used in many spacecraft and space science programs, experiments, projects and modules such as the Galileo spacecraft, Magellan, the Plasma Wave Analyzer instrument on ESA's Ulysses spacecraft, various Earth-orbiting satellites and satellites carrying amateur radio.

RCA 1802 has been verified from NASA source documentation to have been used in the Hubble Space Telescope.

RCA 1802 has a static core CMOS design with no minimum clock frequency, so that it can be run at very low speeds and low power, including a clock frequency of zero to suspend the microprocessor without affecting its operation.

RCA 1802 has a single bit, programmable and testable output port, and four input pins that are directly tested by branch instructions (EF1-EF4).

RCA 1802 is an 8-bit byte machine, with minimal support for 16-bit operations, except via 2-byte manipulation.

An important feature of the RCA 1802 is a set of sixteen registers of 16 bits each, used primarily for addressing.

EF and Q lines were typically used for multiple interfaces on RCA 1802-based hobbyist computers because of the lines' favorable and easy handling.

CDPRCA 1802 has a simple built-in DMA controller, having two DMA request lines for DMA input and output.

In early 1802-based microcomputers, the companion graphics Video Display Controller chip, RCA CDP1861, used the built-in DMA controller to display black and white bitmapped graphics on standard TV screens.

RCA 1802 is a "byte machine", but has 16 16-bit registers, R0-RF.