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Super Game Boy enhancement not working for Pokemon Yellow. #1104
(same behavior with the option set to
Screens taken from RetroArch but results are the same with
Bumping this up just to point out that the base Japanese rom (Pocket Monsters: Pikachu) has no trouble whatsoever with Super Game Boy enhancements. Borders and color work perfectly. It seems that every revision and regional release that followed is affected by the bug.
MapleStoryPSN, that could have something to do with the first Japanese version having no Game Boy Color support.
Pokemon Yellow was sold as a regular Game Boy game in all regions. But it had Game Boy Color features anyway. The first Japanese version was older, seemingly too early to get the GBC features. They added the GBC support in the 1.1 version. All other regional versions were based on the Japanese 1.1 or newer. This makes me think the problem might have SOMETHING to do with the GBC support. But I'm certainly no expert.
There's a byte/some bytes in the header that tells the GBC when the game has GBC support, but I don't remember where.