READY and FAULT are push buttons, just because I couldn't get pure lamps
in the same form factor.
So when I boot RT11, once the disc runs up the “ready” lamp comes on and
stays on whilst RL* is in use. If I release the “load” button, RL* runs
down and the “ready” lamp goes out. Then back on again if I press “load”
and after the disc runs up.
READY is modeled like on the real RL01/02 drive: shining, when the heads
So READY is flickering while seeking, and Off if heads are retracted
because of "cartridge LOAD" condition.
All in all much technical effort for a single white lamp ...