For the most part, you'll have to download an emulator to play these newly updated versions. You can select from numerous ones at Zophar's Domain. Most of them are really easy to use even if you're new to the entire process. If you really want to prove just how hardcore you are, you can have any of the NES ROMs put onto an actual cart at NES Reproductions. He's very reliable and trust worthy.
If you go the emulator route, things get even better. How about some online leagues? Totally Independent Techmo Society offers this service, though I haven't actually tried it. People who have seem to be happy.
So there you have it. EA can keep their Madden franchise exclusive for the next five years. I've got Techmo Bowl for 2006 and beyond. Unless EA decides to become real pricks and slap some ludicrous lawsuit on them, there's no reason this community won't continue for as long as we need them. So here's a heartfelt thanks for your time, effort, dedication, and talent. You all deserve it.