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4 BIOS overview
order in which the POST tests are performed
80 Keyboard test started. clearing output buffer, checking for stuck key, to issue keyboard reset
command.
81 Keyboard reset error/stuck key found. To issue keyboard controller interface test command.
82 Keyboard controller interface test over. To write command byte and init circular buffer.
83 Command byte written, Global data init done. To check for lock-key.
84 Lock-key checking over. To check for memory size mismatch with CMOS.
85 Memory size check done. To display soft error and check for password or bypass setup.
86 Password checked. About to do programming before setup.
87 Programming before setup complete. To uncompress SETUP code and execute CMOS setup.
88 Returned from CMOS setup program and screen is cleared. About to do programming after setup.
89 Programming after setup complete. Going to display power on screen message.
8B First screen message displayed. <WAIT...> message displayed. PS/2 Mouse check and extended
BIOS data area allocation to be done.
8C Setup options programming after CMOS setup about to start.
8D Going for hard disk controller reset.
8F Hard disk controller reset done. Floppy setup to be done next.
91 Floppy setup complete. Hard disk setup to be done next.
95 Init of different BUSes optional ROMs from C800 to start. (Please see Appendix-I for details of
different BUSes).
96 Going to do any init before C800 optional ROM control.
97 Any init before C800 optional ROM control is over. Optional ROM check and control will be done
next.
98 Optional ROM control is done. About to give control to do any required processing after optional
ROM returns control and enable external cache.
99 Any initialization required after optional ROM test over. Going to setup timer data area and printer
base address.
9A Return after setting timer and printer base address. Going to set the RS-232 base address.
9B Returned after RS-232 base address. Going to do any initialization before Coprocessor test.
9C Required initialization before Coprocessor is over. Going to initialize the Coprocessor next.
9D Coprocesor initialized. Going to do any initialization after Coprocessor test.
9E Initialization after Coprocessor test is complete. Going to check extd keyboard, keyboard ID and
num-lock. Keyboard ID command to be
A2 Going to display any soft errors.