So I found this samsung spc-6100 286-12mhz machine in drift store.
After little tinkering I got it working. I Installed ms-dos 5 and the machine works perfectly... except I can't get it to slow down.
If I choose in setup slow mode, the machine boots at 8Mhz but after it loads dos it switches to 12Mhz... there is leds in front of the machine indicating behaviour.
Also key combo ctrl alt - doesn't seem to work. I found from this forum setup files and program for Samsung deskmaster and those doesn't work either.
The motherboard seems to be this.
https://theretroweb.com/motherboards/s/packar … ll-pb686-series