Originally the Harlequin 7, color LCD monitor was upgraded for connection to internal bus of vintage desktop calculator Hewlett Packard HP9825A/B. from year 1976. The HP9825A has 24 kB RAM and a 16-bit hybrid CPU running 8 MHz. It can be programmed in HPL language.

I have developed a small software application called "microChess". This is a chess program that makes it possible to play a chess on HP9825A/B for two players. An upgrade is in development that will allow playing with the chess engine via an internet connection or playing with another small computer running another chess program.