> 
> I recently got a 256MB USB keychain flash drive, and thought it might
> useful to put a "rescue" floppy image on it for troubleshooting and
> repair of systems (which may not be running NetBSD). I tried the
> RESCUE_TINY kernel, which works, but is too limited for my needs--no
> NTFS or USB support, for example. Being able to run vi in visual mode
> would be nice too.
>

you will fit normal NetBSD install without compilers+quite a load of 
packages on 256MB device