> because I had written exactly that myself in the first entry here
I did not see it but yup, I get your point.
As for buying extra fast RAM, yes, as long as a game does not need the extra bandwidth given by fast RAM, any additional RAM, even if slow, would be fine but here it looks like the game is heavy on DMA and CPU which means that it would benefit from fast RAM since this allows the CPU to do its job without being hindered by the chipset.
I also do think that there is a way to make Galaga to run smoothly without actual fast RAM on A500 but that would probably require a lot more work on the engine. It's up to JOTD to decide if that is worth it to him.