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; SCCSID = @(#)dpb.asm 1.1 85/04/10
; SCCSID = @(#)dpb.asm 1.1 85/04/10
BREAK <DPB structure>
;----+----+----+----+----+----+----+----+----+----+----+----+----+----+----;
; C A V E A T P R O G R A M M E R ;
; ;
dpb STRUC
dpb_drive DB ? ; Logical drive # assoc with DPB (A=0,B=1,...)
dpb_UNIT DB ? ; Driver unit number of DPB
dpb_sector_size DW ? ; Size of physical sector in bytes
dpb_cluster_mask DB ? ; Sectors/cluster - 1
dpb_cluster_shift DB ? ; Log2 of sectors/cluster
dpb_first_FAT DW ? ; Starting record of FATs
dpb_FAT_count DB ? ; Number of FATs for this drive
dpb_root_entries DW ? ; Number of directory entries
dpb_first_sector DW ? ; First sector of first cluster
dpb_max_cluster DW ? ; Number of clusters on drive + 1
dpb_FAT_size DW ? ;;Number of records occupied by FAT
dpb_dir_sector DW ? ; Starting record of directory
dpb_driver_addr DD ? ; Pointer to driver
dpb_media DB ? ; Media byte
dpb_first_access DB ? ; This is initialized to -1 to force a media
; check the first time this DPB is used
dpb_next_dpb DD ? ; Pointer to next Drive parameter block
dpb_next_free DW ? ; Cluster # of last allocated cluster
dpb_free_cnt DW ? ; Count of free clusters, -1 if unknown
dpb ENDS
DPBSIZ EQU SIZE dpb ; Size of the structure in bytes
DSKSIZ = dpb_max_cluster ; Size of disk (temp used during init only)
; ;
; C A V E A T P R O G R A M M E R ;
;----+----+----+----+----+----+----+----+----+----+----+----+----+----+----;
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