NDS has a GBA chip. GBA has a GB/GBC chip. PS3 has a PS2 chip (emulates PS1) PS2 has a PS1 chip (used for IO etc in PS2 mode) Etc Although the approach nowaday

NDS has a GBA chip. GBA has a GB/GBC chip. PS3 has a PS2 chip (emulates PS1) PS2 has a PS1 chip (used for IO etc in PS2 mode) Etc Although the approach nowadays seems to be emulation (or not including backwards compatibility).