; Standard Delivery bootloader
; https://github.com/peterferrie/standard-delivery/
; rev. a5b839d7d0fa21b0ff3a7776d9f6c9750b09ae10 of 2016-11-29

;-------------------------------
; ConstructStandardDelivery
; in:    X = ID of which Standard Delivery we should construct
;        (see apidefs.a)
; out:   $1000..$10FF replaced with Standard Delivery bootloader
;        A,X clobbered
;        Y preserved
;-------------------------------
ConstructStandardDelivery
         dex
         beq   @construct32
         dex
         beq   @construct32lo
         dex
         beq   @constructrdos

@construct33p
         lda   #<SD_DOS33p
         ldx   #>SD_DOS33p
         bne   +

@construct32
         lda   #<SD_DOS32
         ldx   #>SD_DOS32
         bne   +

@construct32lo
         lda   #<SD_DOS32LO
         ldx   #>SD_DOS32LO
         bne   +

@constructrdos
         lda   #<SD_RDOS13
         ldx   #>SD_RDOS13

+        sta   @A+1
         stx   @A+2
         ldx   #$00
         txa
-        sta   $1000,x
         inx
         bne   -
         ldx   #$4C
-        lda   @code,x
         sta   $1000,x
         dex
         bpl   -
-        inx
@A       lda   $FFFF,x
         sta   $104D,x
         cmp   #$C0
         bne   -
         rts

@code
         !byte $01,$a8,$ee,$06,$08,$ad,$4e,$08
         !byte $c9,$c0,$f0,$40,$85,$27,$c8,$c0
         !byte $10,$90,$09,$f0,$05,$20,$2f,$08
         !byte $a8,$2c,$a0,$01,$84,$3d,$c8,$a5
         !byte $27,$f0,$df,$8a,$4a,$4a,$4a,$4a
         !byte $09,$c0,$48,$a9,$5b,$48,$60,$e6
         !byte $41,$06,$40,$20,$37,$08,$18,$20
         !byte $3c,$08,$e6,$40,$a5,$40,$29,$03
         !byte $2a,$05,$2b,$a8,$b9,$80,$c0,$a9
         !byte $30,$4c,$a8,$fc,$4c

;
; Format for Standard Delivery parameter table
;
; - word: entry point of next boot phase (Standard Delivery bootloader will JMP to this address)
; - byte array: high byte of target address of each sector, in the following order
;   T00,S0E
;   T00,S0D
;   T00,S0C
;   T00,S0B
;   T00,S0A
;   T00,S09
;   T00,S08
;   T00,S07
;   T00,S06
;   T00,S05
;   T00,S04
;   T00,S03
;   T00,S02
;   T00,S01
;   T00,S0F
;   T01,S00
;   T01,S0E
;   T01,S0D
;   T01,S0C
;   T01,S0B
;   T01,S0A
;   T01,S09
;   T01,S08
;   T01,S07
;   T01,S06
;   T01,S05
;   T01,S04
;   T01,S03
;   T01,S02
;   T01,S01
;   T01,S0F
;   &c. (all other tracks are the same order as track 1)
; - byte: $C0 (end of data)
;
; Unused sectors are marked as $00.
;
; Address array does NOT include T00,S00. This sector holds the Standard Delivery
; code and can not be reloaded at another address (unlike DOS 3.3).

SD_DOS33p
; exit via JMP $10B3
         !byte $b3,$10
; track 0
         !byte     $1E,$1D,$1C,$1B,$00,$00,$00,$00,$00,$00,$13,$12,$11,$10,$1F
; track 1
         !byte $20,$2E,$2D,$2C,$2B,$2A,$29,$28,$27,$26,$25,$24,$23,$22,$21,$2F
; track 2
         !byte $30,$3E,$3D,$3C,$3B,$3A,$39,$38,$37,$36,$35,$34,$33,$32,$31,$3F
         !byte $C0

SD_DOS32
; exit via JMP $B700
         !byte $00,$B7
; track 0
         !byte     $00,$00,$00,$00,$00,$BF,$BE,$BD,$BC,$BB,$BA,$B9,$B8,$B7
         !byte $C0

SD_DOS32LO
; exit via JMP $3700
         !byte $00,$37
; track 0
         !byte     $00,$00,$1C,$1B,$00,$3F,$3E,$3D,$3C,$3B,$3A,$39,$38,$37,$00
; track 1
         !byte $1D,$00,$00,$29,$28,$27,$26,$25,$24,$23,$22,$21,$20,$1F,$1E,$00
; track 2
         !byte $2A,$00,$00,$00,$35,$34,$33,$32,$31,$30,$2F,$2E,$2D,$2C,$2B,$00
         !byte $C0

SD_RDOS13
; exit via JMP $B300
         !byte $00,$B3
; track 0
         !byte     $00,$00,$00,$BD,$BC,$BB,$BA,$B9,$B8,$B7,$B6,$B5,$B4,$B3
         !byte $C0