Name that slot! What Bally machine do I own?

[knixus]

Hello all, Newbie here with a problem...so much info on this site, hard to sift through...I recently acquired a bally game maker hd...except that's all I know...I got the game maker "module 2" along with it but can't apply what's in it to the MPU in the machine, just doesn't seem to match up...anyway...game model # is S9T1V20-20...so what do I have gents? Alpha V20? Please advise where i could get corresponding operating manuals...next issue, on boot up, i keep getting a fatal fault...the line reads as follows: (521) : -e 0x00010000NVRAM mount failure low battery ...so I'm thinking like everybody else, the board memory is shot...so it needs to be replaced...but none of the MPU's pictures or schematics i've seen on here match up to the board in the machine. The board is from 2004 and is PCA40939-0-0C. below thse numbers it reads 187200 07/19. I don't know much about circuit boards but I can't see a 3.6 V battery on the board...i bought a kit to solder on a battery housing for quick swap, but i just can't see where the battery is or if even this is the issue... please advise, i love this sh*t, tracking down answers and all and the two guys I've talked to on here have been great just don't know the machine...next step is paid advice but I'd like to solve it here...thanks in advance

[Stayouttadabunker]

How are you able to write that small? I can't see? 

[knixus]

I don't know why it defaulted that small...bad start to my post...hey, things thawed out enough up in Malone to swing the clubs? Finally getting around to following your advice and posting in general for help...thanks