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#define Numeric         0x30       /* First numeric value          */ 
#define BootLocation    0x7C00     /* Address where DOS loads boot */ 
#define BootSeg         0x7C0      /* Segment where DOS loads boot */ 
#define NewBootLocation 0x7C00     /* Relocation Address           */ 
#define NewBootSeg      0x7C0      /* Relocation Segment           */ 
#define PartAddr        0x1BE      /* Offset to partition table    */ 
#define ValidationAddr  0x1FE      /* Offset to validation bytes   */ 
#define KeyboardFlags   0x417      /* Address of keyboard mask     */ 
#define NumLockOff      0xDF       /* Mask to turn numlock off     */ 
#define NumLockOn       0xFF       /* Mask to leave numlock on     */ 
#define max_partitions  3          /* Can't fit any more           */ 
#define part_text_len   15         /* max bytes for partition desc */ 
 
typedef struct PartitionEntry 
  { 
    char     bootIndicator; 
    char     beginHead; 
    char     beginSector; 
    char     beginCyl; 
    char     systemId; 
    char     endHead; 
    char     endSector; 
    char     endCyl; 
    short    relSectorLow; 
    short    relSectorHigh; 
    short    numSectorsLow; 
    short    numSectorsHigh; 
  } PartitionEntry; 
 
typedef struct PartData 
  { 
    char     partition; 
    char     text[part_text_len]; 
    char     term; 
  } PartData; 
 
#define PartDataLen (sizeof(PartData) * max_partitions) 
 
typedef struct BootData 
  { 
    PartData       partDesc[max_partitions]; 
    char           numlockMask; 
    PartitionEntry partEntry[4]; 
  } BootData; 
 
#define DataAddr (ValidationAddr - sizeof(BootData))