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                    BIOS System Descriptor Table  (PS/2)

      Offset Size          Description

        00   word       length of descriptor (8 minimum)
        02   byte       model byte (same as FFFF:E, not reliable)
        03   byte       secondary model byte
        04   byte       BIOS revision level (zero based)
        05   byte       feature information  (see table)
        06  dword       reserved


        |7|6|5|4|3|2|1|0| feature information at offset 5
         | | | | | | | +--- reserved
         | | | | | | +---- 0=PC bus, 1=Micro Channel
         | | | | | +----- Extended BIOS Data Area (EBDA) allocated
         | | | | +------ wait for external event supported
         | | | +------- INT 15,4F used (kbd intercept)
         | | +-------- RTC present
         | +--------- 2nd 8259 present
         +---------- DMA channel 3 used by fixed disk BIOS


        - see also  MACHINE IDENT  and  INT 15,C0