Robin Gravel's Blog - From: Keep data in cartridges

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Mask Roms are an array of connections of all 1s which during production of the internal chip has locations etched away forming 0s with chemical or other processes

 

Programmable Roms are a different story as are flash memory technology

 

Source: Keep data in cartridges

Yeah!

I always wonder how does the cartridge keep games?

http://atariage.com/forums/blog/56/entry-13286-from-keep-data-in-cartridges/