> Naomi (by Sega) was first and used a GD-ROM or roms. Atomiswave was designed based on > Naomi (by Sammy) which used interchangeable carts (rom only). I'm sure there are > other minor differences as well, but they are different systems made by different > companies, even if they are mostly alike.
Naomi has substantially more memory (including VRAM) than the stock Dreamcast. Atomiswave has exactly the same specs as the home Dreamcast and was intended as a low-end low-cost solution.
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