Timers aren't firing yet so the system locks up as soon as any timeout is involved. Enough to run the command line for a bit.
This lets us select the console routines to use.
Booting on a real MicroVAX 3100/40 via netboot and on simh emulating a micrvax 3900. Doesn't fully work, lots of stuff is stubbed out, but it starts to run and hits unimplemented bits and stops.