this post was submitted on 04 Mar 2025
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Yup, a whopping 128 bytes.
The NES had 2KB each for video and working memory, and 256 bytes for sprites.
The MegaDrive had 64KB each for video and working memory and 8KB for audio.
You forgot about the 32 bytes of palette indexes on the NES!
And all the memory extensions on the cartridges, some added up to 64kB of RAM to the NES.
With bank switching, there's theoretically no real limit to the amount of RAM that could be used on the platform with a custom mapper.