Open boot

Written in FORTH
Roughly equivalent to BIOS

test & init the hardware
determine hardware config
boot the OS from disk or network
interactive debugging

independant of the OS. (actually sits below it)

Can run on the serial port
9600-N-8-1 (9600 baud, No parity, 8bit characters, 1 stop bit

Getting In

On sun keyboard: STOP-A
On serial keyboard, send a BREAK

Stops the OS

Shoud only be done as a last resort

'help' command works

STOP-A    aborts system
STOP         aborts POST
STOP-D     Diatnostic mode

go   -> resume system
sync -> sync data to disk.
printenv   display environment variables
setenv   assign value to envirnment variables (AKA configuration variables)
show-disks list disk drives on system.