Valentin Angelovski has developed Project Fleatiny, a 8051-based hobby board.

“Project Fleatiny is a 100% open-source hobby-computer built around the 8051 micro controller. From a software point of view, Fleatiny consists of a sofware kernel (taking up from ~3K to 9K Program ROM area depending on installed kernel option modules) that essentially turns any fast 8051 core (though an 8052 core is recommended) with 1K of XRAM or more into a small micro-computing platform with VGA video, audio out, PS/2 keyboard input, SDHC card interface, (up to) 8 I/O + 4 inputs and up to 64KByte SPI RAM expansion.”

Fleatiny’s kernel basically acts like a hardware-oriented task-manager. Currently he has released Fleatiny kernel builds for the relatively obscure STC12LE5xxx and Coreriver Midas 3 series MCUs, but promises more will follow.