It looks like my experimental floppy is a complete flop.

However, this is more info.  I didn't realize that the old
boot floppy worked but that the installed stuff didn't.
That makes my life easier.  Ramon's "I found that the
installation failed" was a git incomplete.

I do see that rsc installed a new nvidia.c on June 1.
The changes look more rather than less inclusive but I'll
give them a closer look tonight.