Sun Microsystems SPARCstation 4 110 Service Manual page 26

If you need to run extended FORTH Diagnostics to take advantage of more extensive
tests, see Appendix D.
Power-on switch
POST Phase
FIGURE 2-1
2-2 SPARCstation 4 Model 110 Service Manual • July 1996
Stop
Yes
Keyboard key
pressed?
attached
?
Yes—Skip POST
No
Factory-Defined Boot Sequence—POST Phase Settings and Tests
No
Stop-d
No
keys
pressed?
Yes—Set
diag-switch? to true
Display full status on
true
ttya. View via
tip window display.
Display errors only on
keyboard LEDs,
ttya, and console.
OpenBoot PROM firmware takes control
false (default)
diag-
switch?
true
diag-
switch?
Low-level
false Diagnostic:
POST Phase
No
POST
passed
Yes