For anyone interested or watching the ebay auction: https://www.ebay.com/itm/204051167344
I repaired several of the boards in that machine a couple weeks ago. I didn't know who this guy was until he recently listed it for sale on ebay. At least he's fairly honest about the description and condition. He does mention the Tryonix M-H8 memory board is flakey.
I didn't have any documentation on the M-H8 until after I returned the boards to him. Once I received the documentation, I discovered there is a list of mods and improvements for the board (that it doesn't have currently).
'Just thought I'd pass this information on in case anyone is interested in buying it.
Joe Travis n6ypc