The HP 9845C Demo
A computer released in 1981 with colour graphics capabilities (and was used for the film War Games).
Here are some high quality screenshots from a demo.
The demo package for the HP 9845C is remarkable for several reasons. One aspect is that it is one of the most complex BASIC programs ever developed for the 9845 series. The demo required two full tapes as distribution media, and the main program consisted of more than 4,000 lines of BASIC code. The other, more important aspect lies in the fact, that HP’s engineers not only demonstrated the outstanding capabilities of their 9845C system with high resolution graphics, fast vector engine and up to 4,913 colors, they also used the 9845C as platform for implementing many state-of-the-art concepts in computer graphics and human interaction, like 3D shading, ordered dithering, wireframe rendering, interactive light pen control or just using color for better visualization of complex data.
You can view the whole selection of images here
Discovered via Socks Studio (but uses dated photographs for examples, although it does give them a nice retro effect).
PS - If anyone knows if there is an emulator that can run on a PC, let me know …