@leirbag28
It's correct that for the clockport alone the A600 doesn't need anything extra but for the USB it needs a 020 CPU or better so this only qualify expanded A600's. As A600 CPU boards are expencive and hard to come by it's suggested that one purchase such a thing before thinking of expanding it with the SubwayUSB.
In the end I doubt there's a significant market for USB on A600.