Quoted from swampwiz:
I noticed this listing, which claims to be for a new MPU. It looks like an OEM, and not an Alltek.
ebay.com link » Brand New Dash 35 Mpu Cpu Pcb Bally Pinball All Chips Socketed
That was the twobits board. They were bought out by game boards USA: https://gameboardsusa.com/shop?olsPage=products%2Fbally-dash-35-mpu-board-with-fixit-rom-board