;-------------------------------
; Passport maintains a table of codes for each sector on the disk.
; One byte per sector, arranged in increasing logical sector order
; from T00,S00 to T22,S0F. Some sectors have their own individual
; labels for convenience, but you can use math to find any specific
; sector.
; e.g.
;        LDA   #kSectorOptional
;        STA   T00S0A
; will mark T00,S0A as optional
;
;        LDA   #kSectorOptional
;        LDY   #$0A
;        STA   T00,Y
; will also mark T00,S0A as optional
;
; The sector map is reset for each disk (to #kSectorRequired for
; all sectors), then modified based on boot sector identification
; and other factors.
;
; Codes are opaque values, not bit flags.
; Some codes are grouped into ranges that are compared as integers.
; Always use labels for comparison.
;
kSectorIgnore   = $00                ; ignore this sector (don't even read it)
kSectorOptional = $01                ; sector is optional (read, but errors are non-fatal)
kSectorSwitchToBuiltinRWTS = $FE     ; sector is required, and switch to built-in RWTS before reading it
kSectorRequired = $FF                ; sector is required (errors are fatal)

; range of codes that trigger various custom routines before reading a sector
kSectorCustomFirst = $C0
kSectorCustomLast = $D0
; specific codes
kSectorResetAdaptiveRWTS = $C0       ; will accept any epilogue on next sector, then remember it
kSectorIgnoreAddressChecksum = $C1   ; will ignore address field checksum
kSectorCustomDOS32B4BB = $C2         ; DOS 3.2 / JMP B4BB RWTS swapper
;-------------------------------
InitSectorMap
!zone {
         lda   #<sectormap
         sta   .B+1
         lda   #>sectormap
         sta   .B+2
         lda   #kSectorRequired
         ldx   #$22
.A       ldy   #$0F
.B       sta   $FFFF
         inc   .B+1
         bne   +
         inc   .B+2
+        dey
         bpl   .B
         dex
         bpl   .A
         rts
}

sectormap
T00S00
T00      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T00S09   !byte                                     $FF
T00S0A   !byte                                         $FF
T00S0B   !byte                                             $FF
T00S0C   !byte                                                 $FF
T00S0D   !byte                                                     $FF
T00S0E   !byte                                                         $FF
T00S0F   !byte                                                             $FF
T01      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T01S0F   !byte                                                             $FF
T02      !byte $FF,$FF,$FF,$FF,$FF
T02S05   !byte                     $FF
         !byte                         $FF,$FF,$FF,$FF,$FF,$FF
T02S0C   !byte                                                 $FF
         !byte                                                     $FF,$FF,$FF
T03      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T04      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T05      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T06      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T07      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T08      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T09      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T0A      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T0B      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T0C      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T0D      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T0E      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T0F      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T10      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T11      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T11S0F   !byte                                                             $FF
T12      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T13      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T14      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T15      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T16      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T17      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T18      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T19      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T1A      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T1B      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T1C      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T1D      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T1E      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T1F      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T20      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T21      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T22      !byte $FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
T22S0F   !byte                                                             $FF