The Sega Genesis had different version, a 32x add-on, a Sega CD add-on, and finally the "remodel" in the form of the Sega Nomad (adding in a color screen and portability).
The PS2 had multiple versions, the final "slim" version of which did not support the hard drive needed to play FF XI. The N64 had the memory cartridge expansion, the Gameboy Advance went through several iterations with different games support and features (GBA, SP, Micro)...
The NES, Jaguar, and well... yes? Upgrades and different SKUs were not quite the way we've seen recently, but there were different SKUs, especially with system with add-ons, in which features would be integrated. Take a look at the DVD-player Gamecube, for example.
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