Mortal Kombat II Eprom Question?

jayleone

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I have an older version of a MK2 pcb with the 4Mb eproms and expansion board. Problem is the expansion board went missing. The system boots up and complains that it is missing the eproms U6 through U13 (all eproms on the expansion board). My question - is there anyway to replace the 4Mb eproms with the newer 8Mb eproms on the mainboard and have it work? I've tried replacing what I thought were all the required 4mb eproms with the 8mb devices (twelve 27C801 devices in total), but it still complains I'm missing components. Anyone know how to make this work? Is there a dip switch / jumper somewhere?

Thanks!!
 
oh shit, you're right, there IS a dipswitch for this. you asked me about this last week, I forgot all about it.

http://www.solvalou.com/subpage/arcade_dips/M/mk2

see the one that says Circuit Boards 2 or 1? try flipping that.

you might NEED 3.1 roms in order to do this, but I'm assuming you do. :)


in Bank 1, Switch 9, turn that one to On. see if that fixes it.
 
yeah, I think the T-unit has this feature because my NBA Jam TE board for instance doesn't even have the pins for the expansion board. I imagine you could do some amusing shit if you set that dipswitch to "2 circuit boards" :)

I imagine what it does is disable the expansion pins and only look for roms in the mainboard sockets. how do you know you have the roms placed in the right sockets though, were you able to find a manual showing what roms go where or something?
 
I was reading this thread and I have a busted MK2 so i thought i would check this out. I am finding the only place that is mentioning this "circuit boards" dip value is on MAME. I can't seem to find any midway manuals that cover this sort of thing, so it may not be a real dip option but something for mame only to work with boards like nba jam vs mk2 etc? maybe?

Either way, i ended up fixing my MK2 last night so thanks for having me yank it out of the closet!
 
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