American FDS- What would have been?

[Niku-Sama]

So, how far along WAS an American Disk System? Not even beyond drawings?

send Nintendo an e-mail and ask them, since they have gone dormant on 20 yard old hardware and not renewing things they might just tell you.

I think if it were something that they wanted to be viable in the states the discs would almost have to have been modified 3 1/2 inch 1.44 Mbyte floppies instead of modified quick disks like the FDS wound up being.
considering 1.44Mbyte floppies were available in '87 and the lead time of a few years was the norm from something to get to the US from Japan after R&D for the new region its entirely plausible.