Early color handheld consoles

This is the list of the first color handheld consoles. Most of these consoles used small (mostly flat) CRT screens, because there weren't color LCD screens until 1984. The most well known of these is the Commodore VIC-20 Pocket, a portable version of the Commodore VIC-20 that was marketed as "More than a Handheld Game, it is also a Handheld Computer that runs BASIC!". Despite this technology was mostly developed in 1970s and even in late-1960s, it wasn't common until 1980s and 1990s.

Branding
The With RGB brand appeared in 1979 for products with a color display.

The first transistor and early videogames (1948 - early-1950s)
The first transistor was invented in 1948, being a revolution, reducing electronic devices size. Also, there were early videogame experiments back then.

Early transitor-based color TV CRTs (1960s)
Transistor-based color TVs were invented in late-1960s, this made possible to make small devices with a small colour CRT screen. However, even though there were transistor-based computer systems, these were still too expensive and big.

The first microchip CPU processor (1971)
The Intel 4004 was released in 1971, it made possible to make even smaller devices.