Here you have something to deal with STM8 MCUs.
They have weird but powerfull CISC command set, nice hardware and are pretty cheap.
If you are not a great solderer, you may buy mini-board with CPU and with or without soldered pins, etc. The board I've bought has reset button and led attached to PB5 pin, so, I had to solder only four pins to connect the board to usb programmer (ST-Link) to try.
STM8 can run program in RAM, and ST visual programmer can launch it without touching the FLASH memory, so, in attached example you may found a program which may blink the LED on PB5 pin from RAM.
Also there is a batch to convert stm8 headers into fasmg includes - you need sed installed to use it.

I'm new to this architecture, so, all offsets are restricted to be positive, and I'm not sure about MOV mem,mem: which is "mem1" and which is "mem2", I supposed the first offset after opcode is source, and the last is destination - must check it Also, I have not check its behavior well on bad syntaxis...
So, bugfixes are welcome

Thank you for your continued exploration of new architectures with fasmg! I have added it to the list.

I'm glad to contribute such great assembler!