Williams pinball MPU boards

More house cleaning.what wou are looking at are Willams pinball MPU boards.a system 3 a system 4 and a system 6 .some have parts missing,I believe they were working when put on the shelf a few years ago but parts were removed to fix others so these are sold for parts or repair.the poards look good no hacks or acid damage that I can see.sold as is .