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Numeric         equ     30H             ; First numeric value 
BootLocation    equ     7C00h           ; Address where DOS loads us 
BootSeg         equ     07C0h           ; Segment where DOS loads us 
NewBootLocation equ     7A00h           ; Address where we relocate 
NewBootSeg      equ     07A0h           ; Segment where we relocate 
PartAddr        equ     1beh            ; offset to partition table 
KeyboardFlags   equ     417h            ; Address of keyboard mask 
NumLockOff      equ     11011111b       ; Mask to turn numlock off 
NumLockOn       equ     11111111b       ; Mask to leave numlock on 
max_partitions  equ     3               ; Can't fit any more 
part_text_len   equ     15              ; max bytes for partition desc 
 
PartitionEntry  struc 
BootIndicator   db      ? 
BeginHead       db      ? 
BeginSector     db      ? 
BeginCyl        db      ? 
SystemID        db      ? 
EndHead         db      ? 
EndSector       db      ? 
EndCyl          db      ? 
RelSectorLow    dw      ? 
RelSectorHigh   dw      ? 
NumSectorsLow   dw      ? 
NumSectorsHigh  dw      ? 
PartitionEntry  ends 
 
PartData        struc 
partition       db   0 
text            db   part_text_len dup(0) 
term            db   +80h 
PartData        ends 
 
PartDataLen     equ  SIZE PartData * max_partitions 
 
BootData        struc 
numlockMask     db   NumLockOff 
BootData        ends 
 
BootDataLen     equ  SIZE BootData 
 
DataAddr        equ  PartAddr - BootDataLen - PartDataLen