Stuffmonger
Member
So, I am doing some work on a friend's robotron board. I fixed up his jamma adapter, and his boardset works just fine. There are a few oddities, however that I would like to figure out the purpose to before I do any modifications to it.
The board is set up for jamma (I.E. the trace for video sync has been cut).
The battery holders have also been removed.
I am told it does not save scores (which doesn't surprise me knowing the batteries are gone).
Now for the mystery stuff:
on the cpu board, diagonally across from the battery holder area (top-left corner), a daughterboard has been added to the IC that is 3rd from the left on the top row. Daughterboard contains one IC (STK25C48-W45) and a part like in the pic (not sure what those are called) numbered 6A472G.
On the rom board, there is another daughter card installed in the bottom center IC. It has another part like in the pic, but yellow, and without a part number on it. It also has an IC numbered 74LS244N.
Anyone know what the purpose of these mods? Thanks in advance.
The board is set up for jamma (I.E. the trace for video sync has been cut).
The battery holders have also been removed.
I am told it does not save scores (which doesn't surprise me knowing the batteries are gone).
Now for the mystery stuff:
on the cpu board, diagonally across from the battery holder area (top-left corner), a daughterboard has been added to the IC that is 3rd from the left on the top row. Daughterboard contains one IC (STK25C48-W45) and a part like in the pic (not sure what those are called) numbered 6A472G.
On the rom board, there is another daughter card installed in the bottom center IC. It has another part like in the pic, but yellow, and without a part number on it. It also has an IC numbered 74LS244N.
Anyone know what the purpose of these mods? Thanks in advance.
