475
All the other brands went along
(slrpnk.net)
This is a most excellent place for technology news and articles.
And what the hell, add RS-422 while you're at it. And a parallel port! And the left side expansion port they used to have on the Amiga 500 and 1000!
And some ISDN BRI ports. And ATM and FDDI. And something I can do X.25 over. Oh, and Token Ring.