Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 15h Function 21h Subfunction 01h
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  Interrupt:   15h     Function:   21h     Subfunction:   01h
 
  Title:       Write POST Error Log
 
  See also:    Read POST Error Log
 
  Description:                                                    [PS/2]
 
     Adds an entry to the power-on self-test (POST) error log. This
     function is not available on the PS/2 Models 25 and 30.
 
     Input                      Output
 
     AH = 21h                   If function successful
     AL = 01h                     Carry flag: clear
     BH = Device identifier       AH = 00h
     BL = Device error code
                                If function unsuccessful
                                  Carry flag: set
                                  AH = Status
                                       01h = Error list full
                                       80h = Invalid command
                                       86h = Function not supported
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