On 2019/04/08 5:09 p.m., compyislife wrote:
Hi, everybody. For quite some time now, I've owned a dedicated Mortal
Kombat 2 cabinet, and a Y-Unit MK1 JAMMA board that's been running
inside it. Someday I want to make it into a multi-JAMMA cabinet, but at
this pace, it'll be a while. Just recently, I tried swapping out roms on
the board, for the first time, to install a copy of the Turbo 3.1 hack.
To be horror, the machine is now behaving as though there's no
motherboard in there at all! I would think that changing 2 roms wouldn't cause the entire board to fail, but instead would just have them come up
as red during the startup sequence. Did I somehow damage the board? Are
the roms really the problem, even though it was working before? Any help would be greatly, greatly appreciated.
All it takes is one (r two) wrong ROM (EPROMs) for the game to give up
trying to book.
So, put the originals back in, taking great care not to bend any pins or putting the EPROM(s) in backwards - there is a notch on one end of the EPROM(s), that matches the end of its socket. Plug in backwards and you
will most likely destroy the EPROM(s)!
The memory in the EPROM(s) tells the CPU how to run, starting with the
BOOT EPROM(s). If you have removed, incorrectly exchanged, or damaged
the BOOT EPROM(s) then the game will probably do nothing at all. Perhaps
you will get an audio sound(s) which won't indicate much of anything.
John :-#)#
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