Converting Galaga 3 back to Gaplus

Paul Olson

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Does anyone know which roms need to be swapped to convert this back? I have read that there are 2 or 3 roms to swap, but I only see one on the board that that doesn't have a gaplus sticker, and it is at 9L.

I have been searching on this, but I haven't found any good information yet.
 
I saw that, but it doesn't match conversions that I have read about here. It supposedly only takes 2 eproms to do the swap. It also doesn't match what I am seeing on my board. It looks like the first different one is at 8b, and I don't have an eprom there.

I have read that there are 2 different boards used in this game, so that could be the difference I guess. I do see the 2 proms in the correct spots on the board.
 
Yup... There are 2 versions of the game boardset.

If you have the one that is different then you'll need to use an EPROM programmer to determine which chip is which and replace the ones that aren't in the other software set.
 
I replaced two proms (3e and 3f), and one eprom at 9L. The game is now functioning correctly as Gaplus. It looks like there are two eproms that should be swapped (according to MAWS), but I only had one that didn't have the original Gaplus sticker on it. I have the larger board, so that may account for the difference. Anyway, it is working now. :)
 
Does the title screen look right? On the board I worked on I had to replace 2 PROMs too.
 
Well, this is as good as it is going to get until repro CPOs are available.
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