Emergency Keyboard Commands

Hold down keys during power-on sequence. 

Stop

Bypass POST. This command does not depend on security-mode. (Note: some systems bypass POST as a default; in such cases, use Stop-D to start POST.)

Stop-A

Abort. 

Stop-D

Enter diagnostic mode (set diag-switch? to true).

Stop-F

Enter Forth on TTYA instead of probing. Use fexit to continue with the initialization sequence. (Useful if hardware is broken.)

Stop-N

Reset NVRAM contents to default values.