Just a thought i converted well actually built the pinballs from a couple of playfields using arduinos to replace the em stuff. The machines are a gottlieb flying carpet and a duotron. I was looking into the next step and found this guy who is designing a board for use with stm32 micros it is call cobrapin. After getting a couple of stm32 blue pills i loaded the arduino ide and my pinball software a few minor mods on pins and it appears to be ok so i ordered the new board. i will not be here till june but i have my code ready for the gottlieb flying carpet ready to go. I can play my flying carpet with the arduinos and freetronics modfet drivers so i am ok. Some really clever people out there, i did thing about OPP amd the mission stuff but i like to build from scratch.