MK2 PCB help.. what's the deal (lol)

khabbi

New member
Joined
Feb 9, 2010
Messages
2,058
Reaction score
19
Location
Tampa, Florida
I have an original MK2 with it's original PCB, but it has a few issues.. Recently I purchased another MK cabinet that had a MK2 PCB that was fully working, so I pulled it to put in my MK2, only to realize that I don't know what the heck is going on! Forgive me for being a PCB newb, all of the PCB's I've dealt with were either the 3 stack (such as Trons) or one boards such as MK4..

So, that being said, here's what the PCB in my cabinet looks like, it's the factory installed pcb with a sandwich type setup (one attached to the cab, the other smaller board in parallel, then another board below that :

mk2pcb1.jpg


Here's the MK2 pcb that I pulled out of my MK4 cab, it only had the two boards and the cables are connected in a way that is confusing with how I am supposed to swap this out with my current MK2 PCB (hence, I'm hoping someone can help!)

mk2pcb2.jpg


Thanks in advance for your help! :)
 
how about you just donate me the bottom one? :)

an explanation for you...

the one with the "sandwich setup" as you call it is one of the older model boards (I use "older" loosely) that used smaller 4 mb roms, and thus it required more rom banks to work. the interlock board is commonly called the "memory expansion board" or just an "expansion board" since it's an extra board used for storing the additional needed roms.

later in the production cycle, Midway started using 8 mb roms, which required fewer rom banks. this eliminated the need for the expansion board and just used what was on the actual T-unit board.

the sound boards are the same.

the only difference is 'more 4 mb roms' vs. 'less 8 mb roms'.

hang onto that 8 meg jobber... they're kinda rare, much like the MK1 T-unit boards.
 
Thanks! Glad you cleared that up for me, lol.. Now I have to check my MK1 to see which boardset I have in that one, I prob. have a t-unit in there I'll bet! :)
 
to minimize the possibility of giving yourself a coronary, just boot the game up. it'll say on the revision screen if it's T-unit or not. ;)

otherwise, if it looks like your MK2 board, then that'll tell too. best way is to match up the dipswitch bank arrangements... if you have a battery holder immediately underneath the dipswitches, it's a Y-unit.
 
Back
Top Bottom