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; LDT.INC

.IFNDEF         __LDT_INC__
__LDT_INC__     .SET    1

.LIST on
;---------------------------------------------------------------------------
; Logical Drive Table (LDT) -- page 0 offset's
;---------------------------------------------------------------------------

 STRUCT         LDT
ldt_fg1         .DB             ; logical volume flag's
                                ; <7>: device ready (fdc drive or ata device)
                                ; <6>: if=1->HD/CF else->FD
                                ; <1:0>: phisycal device number

ldt_fg2         .DB             ; <7>: valid volume (fat volume or cbm disk)
                                ; <6>: if=1->FAT else->CBM (FD only)
                                ; <5>: disk format checked
                                ; <1:0>: disk format (fdc only)

ldt_root        .DW             ; lba of root dir
ldt_fat1        .DW             ; lba of fat1 table
ldt_fat2        .DW             ; lba of fat2 table
ldt_cls         .DW             ; lba of first data cluster
ldt_max         .DW             ; max usable cluster + 1
ldt_rent        .DW             ; root dir. max. entries
ldt_cent        .DW             ; max. entries in dir. cluster
ldt_eoc         .DW             ; end of cluster chain marker
ldt_free        .DW             ; count of free cluster's
ldt_nxt         .DW             ; next free cluster
ldt_fsiz        .DW             ; fat table size

ldt_csiz        .DB             ; cluster size (1,2,4,8,16,32,64)
ldt_cshf        .DB             ; cluster shift (0,1,2,3,4,5,6)
ldt_rsiz        .DB             ; root dir. size (sector's)
ldt_mcls        .DB             ; mask for clust. module: 00,01,03,07,0F,1F,3F
ldt_cdlp        .DW             ; current working dir list pointer
ldt_cdcls       .DW             ; current working dir start cluster
ldt_cdlvl       .DB             ; current working dir level count

ldt_ptype       .DB
ldt_pstart      .LWORD
ldt_psize       .LWORD

ldt_fp          .EQU    ldt_pstart      ; fat table buffer long pointer
ldt_fbuf        .EQU    ldt_pstart+3            ; fat table: x-mem base bank/dma buffer 

ldt_pbr         .EQU    ldt_psize               ; long pointer to PBR cache buffer
ldt_fmt         .EQU    ldt_psize+3

 ESTRUCT        LDT

.ENDIF