Here is the famous HCMP1802D clocked at 5MHz by Hughes Aircraft Semiconductor
Gold-plated ceramic industrial military standard used for military aeronautical and aerospace applications
COSMAC for friends!
By Hugues Aircraft Company

The first CMOS microprocessor

Here in a military standard version with additional protection against radiation.

Manufactured at the same time as its four cousins who are still on board Viking Voyager 1 and 2, of which they have been in charge since 1977!

Considered a centerpiece of any retrocomputing collection!

A little history…

The RCA CDP1802 is an 8-bit microprocessor and was one of the first, if not the first, built with CMOS technology. This technology has very low power consumption, 0.01-0.02 watts, can operate at a wide range of supply voltages and is capable of operating in the military-type temperature range.

Each of the 16 1802 registers can be used as a data pointer or program counter and can point to any memory location. it is possible to jump to any memory location by simply putting its address in one of the free registers. This trick was used when it was necessary in a program to jump to the instructions of a subroutine. 1802 has no stack instructions, and stack operations can be simulated using store instructions.

The 1802 was produced by RCA, Harris, Hughes aircraft and SSS in a 40-pin package, operated at frequencies of 3.2 MHz, 5 MHz and 6.4 MHz (a frequency, the latter, exceptional for 1974) and could target 64 KB of physical memory. Despite being thirty years old, 1802 continues to be used in many industrial and commercial applications. because of its low power consumption, it was the first microprocessor to be used aboard a spacecraft, Voyager 1, in 1977 and later on the Viking and Galileo probes. Some versions of the chip were actually built using layers of silicon on a tiny slab of synthetic sapphire, a feature that made them extremely resistant to cosmic rays.

One of the features of 1802 was that the chip could be suspended simply by stopping the clock and simplicity of architecture was the main goal during design, making this one of the first RISC chips.

The 1802 was used in Cosmac computers, in some RCA and Radio Shack video games and in the ETI-660 computer for RETRO GAMING enthusiasts RETROGAMING