I ordered an XH-M194 board  about half a year ago, and it remained shelfed for about 5 months. A GitHub user finally nudged me into writing board support code.

The the guy who designed the board missed many opportunities, and it took me a while to decide how to implement the serial interface for the Forth console. The board offers a lot of outputs, more keys than most boards, and an RTC, but unfortunately no inputs.

The controller, an STM8S105S4T6, is an STM8S medium density device with 2K RAM, 1K EEPROM and 16K Flash. The medium density device I tested all had 32K Flash, and it's quite possible that you won't find a chip with no more than the advertised amount of memory.