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  Description:  Read POST Error Log      [PS/2]
 
  Returns error information that was accumulated during the most recent
  power-on self-test (POST).
 
  Input             Output
  ══════            ══════════════════════════════════════
  AH=21H            If function successful
  AL=00H            Carry flag=clear
                    AH=00H
                    BX=number of POST error codes stored
                    ES:DI=segment:offset of POST error log
                    If function unsuccessful
                    Carry flag=set
                    AH=status
                       80H=invalid command
                       86H=function not supported
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