>   I want to build a network boot floppy for NetBSD.
> (eventually, a PROM for a network card, but that can wait)
> 
>   It should tftp a kernel and an a ramdisk from a TFTP server.
> I don't want to do NFS. I would rather that it worked with NE2000 type
> stuff, but I'll cope with 3c509 for now. 

For what it's worth, at work we use GRUB to netboot all of our
1.5.2 workstations. As far as loading a ramdisk goes, you may want
to go the route that INSTALL kernels use, and combine the kernel+image
into a single file.

(Unfortunately, compiling GRUB requires the new toolchain with a
newer gas than what the stock 1.5.x release has. -current works
fine, however. cf http://savannah.gnu.org/projects/grub/ )