double word | offset | length | bit-field value based on
    ------------+--------+--------+----------------------------
         H1     |      0 |     10 | volume serial number string
                |        |        | of system volume
         H1     |     10 |     10 | network adapter MAC address
                |        |        | string
         H1     |     20 |      7 | CD-ROM drive hardware
                |        |        | identification string
         H1     |     27 |      5 | graphics adapter hardware
                |        |        | identification string
         H2     |      0 |      3 | unused, set to 001
         H2     |      3 |      6 | CPU serial number string
         H2     |      9 |      7 | harddrive hardware
                |        |        | identification string
         H2     |     16 |      5 | SCSI host adapter hardware
                |        |        | identification string
         H2     |     21 |      4 | IDE controller hardware
                |        |        | identification string
         H2     |     25 |      3 | processor model string
         H2     |     28 |      3 | RAM size
         H2     |     31 |      1 | 1 = dockable
                |        |        | 0 = not dockable