this post was submitted on 13 Aug 2024
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The Oracle games had GBA releases? Wow, that's news to me.
They don’t. These are reproduction cartridges and not official. Apparently these are using emulators.
They might be tricking the GBA into thinking it's a GB cartridge (it has a built-in GBC "emulator"). I found different ways this could work online: perhaps by adding extra plastic to actuate a switch (that switches between 5 V (GBC) and 3.3 V (GBA) power to the cartridge); alternatively, the ROM chip is made to withstand both voltages and the system selection is done by a 0 in the top bit of the cartridge's "B" register.
Indeed that could be the case but they are definitely not official cartridges.