People keep saying videogames used to have exotic hardwares and "boooh now are just PC", but since 1972, many console actually had pretty standard chipsets.
Atari 2600 had a MOS 6507 used in NES, AppleII, Lynx and other 30 systems or even more.
Megadrive had a 68000 also used in Amiga, Neogeo, ST, X68000 and so on, not counting many arcade boards.
Do we talk about the Z80?
PSX used a RISC3000, the same family we also found in N64 and some workstation and arcade.
Gamecube used a IBM CPU used for like 10 years in many devices, some of them even used in space rockets
XBOX had a Pentium 3 CPU
Dreamcast and Saturn used "not" custom Hitachi chips.
Different story is about video chips, but just that.
The only chipset specifically created for games were the EE, Cell and the Xenon.