If your PSX games were running on 3.80 m33, then give them a shot on 3.90.
If it doesn't work, then there may be a patch needed. Let us know details! Information is a two way street... you'll feel good for contributing some new knowledge to the community!
I think, though, that from what D_A said about how similar the two firmwares were, everything that worked in 3.80 should continue to work in 3.90.
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