Well, it's not new in the 6502 world either. The Apple IIGS has to do just this to clock down its 2.8Mhz CPU selectively to work with the floppy drives and such

Well, it's not new in the 6502 world either. The Apple IIGS has to do just this to clock down its 2.8Mhz CPU selectively to work with the floppy drives and such, outside of doing that to run as an Apple II.