So, I have this 425e.  I have a monitor, keyboard, and serial terminal
connected to it.  It has one of the `new' graphics adapters that we
don't have drivers for.

I turn it on, and the diagnostic messages go to the monitor.  I've
cloned a disk from a working 380, and it loads a boot program off of
it.  (The rest of this happens when the boot program is loading via
rboot, also.)

After the boot program is loaded, the screen clears, I hear no more
disk activity, and (as far as I can tell) nothing further happens.

I'm almost certain I've booted an experimental, unfinished netboot
program on this machine before, and had it display to the serial port,
but it doesn't seem to work now, so maybe I'm confused.

Anyone have a clue what I should do next?  I'd really like to get this
machine running.