bpb.equ

DOS源码

;    File              : $BPB.EQU$
;
;    Description       :
;
;    Original Author   : DIGITAL RESEARCH
;
;    Last Edited By    : $CALDERA$
;
;-----------------------------------------------------------------------;
;    Copyright Work of Caldera, Inc. All Rights Reserved.
;      
;    THIS WORK IS A COPYRIGHT WORK AND CONTAINS CONFIDENTIAL,
;    PROPRIETARY AND TRADE SECRET INFORMATION OF CALDERA, INC.
;    ACCESS TO THIS WORK IS RESTRICTED TO (I) CALDERA, INC. EMPLOYEES
;    WHO HAVE A NEED TO KNOW TO PERFORM TASKS WITHIN THE SCOPE OF
;    THEIR ASSIGNMENTS AND (II) ENTITIES OTHER THAN CALDERA, INC. WHO
;    HAVE ACCEPTED THE CALDERA OPENDOS SOURCE LICENSE OR OTHER CALDERA LICENSE
;    AGREEMENTS. EXCEPT UNDER THE EXPRESS TERMS OF THE CALDERA LICENSE
;    AGREEMENT NO PART OF THIS WORK MAY BE USED, PRACTICED, PERFORMED,
;    COPIED, DISTRIBUTED, REVISED, MODIFIED, TRANSLATED, ABRIDGED,
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;    CIVIL LIABILITY.
;-----------------------------------------------------------------------;
;
;    *** Current Edit History ***
;    *** End of Current Edit History ***
;
;    $Log$
;    ENDLOG

BPB		struc
BPB_SECSIZ	dw	?	; # of bytes per sector 
BPB_ALLOCSIZ	db	?	; # of sectors per allocation unit
BPB_FATADD	dw	?	; # of reserved sectors (1)
BPB_NFATS	db	?	; # of fats
BPB_DIRMAX	dw	?	; # of directory entries
BPB_TOTSEC	dw	?	; # of sectors total in image
BPB_FATID	db	?	;  holds a copy of the fat id byte
BPB_FATSEC	dw	?	; # of sectors in a fat
BPB_SPT		dw	?	; # of sectors per track
BPB_HEADS	dw	?	; # of heads
BPB_HIDDEN	dd	?	; disk offset (32 bit)
BPB_SIZE	dd	?	; disk size (32 bit)
BPB_RESRVD2	db	6 dup (?)
BPB		ends

BPB_LENGTH	equ	size BPB