 Repairs drive. Usually is able to repair filesystem from boot monitor. Failing that, front-panel toggles microkernel in and starts script on neighboring machine to load binary boot code into broken machine, reformat and reinstall OS. Lets it run over the weekend while he goes mountain climbing.  Repairs drive. Usually is able to repair filesystem from boot monitor. Failing that, front-panel toggles microkernel in and starts script on neighboring machine to load binary boot code into broken machine, reformat and reinstall OS. Lets it run over the weekend while he goes mountain climbing. 