Donkey Kong Machine - Hardware Mod

DWest

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So, I bought my first arcade machine yesterday. A nice two board, fully functional, blue donkey kong machine. After playing around with it a bit, I noticed the sequence of levels for donkey kong wasn't quite right. (I would get the second screen twice and so forth). So I opened up the back and to my surprise there was a board attached by a ribbon cable where an eprom should be. (Had a copyright of 1982 - LINEAR ELEC) Luckily the mod had the original eprom on it, so with a little careful switching everything was back to normal.

My question is - How common were these mods back in the day? Looking it up on the internet, I could find almost nothing about modding an arcade machine.

(The mod had 4 dip switches that would alter the sequence of levels further and do... god knows what else)
 
That sounds pretty cool, do you have any pictures of the mod?
 
I've had one as well since bulk buy from operator in the late 90s.
 

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That's some confusing wording... Drums? The Pac-Man mod wording is even more confusing...

I bet none of this is archived!
 
Reduce play time by 50%! So for novices down from 2 minutes to 1. I would have been so p'd off! :D
 
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