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152 lines
3.6 KiB
Plaintext
152 lines
3.6 KiB
Plaintext
; Standard Delivery bootloader
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; https://github.com/peterferrie/standard-delivery/
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; rev. a5b839d7d0fa21b0ff3a7776d9f6c9750b09ae10 of 2016-11-29
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;-------------------------------
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; ConstructStandardDelivery
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; in: A = low byte of Standard Delivery parameter table (see below)
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; X = high byte of Standard Delivery parameter table
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; out: $1000..$10FF replaced with Standard Delivery bootloader
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; all registers clobbered
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; A,X clobbered
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; Y preserved
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;-------------------------------
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ConstructStandardDelivery
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dex
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beq @construct32
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dex
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beq @construct32lo
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dex
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beq @constructrdos
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@construct33p
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lda #<SD_DOS33p
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ldx #>SD_DOS33p
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bne +
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@construct32
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lda #<SD_DOS32
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ldx #>SD_DOS32
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bne +
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@construct32lo
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lda #<SD_DOS32LO
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ldx #>SD_DOS32LO
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bne +
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@constructrdos
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lda #<SD_RDOS13
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ldx #>SD_RDOS13
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+ sta @A+1
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stx @A+2
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ldx #$00
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txa
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- sta $1000,x
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inx
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bne -
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ldx #$4C
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- lda @code,x
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sta $1000,x
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dex
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bpl -
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- inx
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@A lda $FFFF,x
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sta $104D,x
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cmp #$C0
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bne -
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rts
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@code
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!byte $01,$a8,$ee,$06,$08,$ad,$4e,$08
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!byte $c9,$c0,$f0,$40,$85,$27,$c8,$c0
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!byte $10,$90,$09,$f0,$05,$20,$2f,$08
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!byte $a8,$2c,$a0,$01,$84,$3d,$c8,$a5
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!byte $27,$f0,$df,$8a,$4a,$4a,$4a,$4a
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!byte $09,$c0,$48,$a9,$5b,$48,$60,$e6
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!byte $41,$06,$40,$20,$37,$08,$18,$20
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!byte $3c,$08,$e6,$40,$a5,$40,$29,$03
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!byte $2a,$05,$2b,$a8,$b9,$80,$c0,$a9
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!byte $30,$4c,$a8,$fc,$4c
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;
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; Format for Standard Delivery parameter table
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;
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; - word: entry point of next boot phase (Standard Delivery bootloader will JMP to this address)
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; - byte array: high byte of target address of each sector, in the following order
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; T00,S0E
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; T00,S0D
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; T00,S0C
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; T00,S0B
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; T00,S0A
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; T00,S09
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; T00,S08
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; T00,S07
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; T00,S06
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; T00,S05
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; T00,S04
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; T00,S03
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; T00,S02
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; T00,S01
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; T00,S0F
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; T01,S00
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; T01,S0E
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; T01,S0D
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; T01,S0C
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; T01,S0B
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; T01,S0A
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; T01,S09
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; T01,S08
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; T01,S07
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; T01,S06
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; T01,S05
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; T01,S04
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; T01,S03
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; T01,S02
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; T01,S01
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; T01,S0F
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; &c. (all other tracks are the same order as track 1)
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; - byte: $C0 (end of data)
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;
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; Unused sectors are marked as $00.
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;
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; Address array does NOT include T00,S00. This sector holds the Standard Delivery
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; code and can not be reloaded at another address (unlike DOS 3.3).
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SD_DOS33p
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; exit via JMP $10B3
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!byte $b3,$10
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; track 0
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!byte $1E,$1D,$1C,$1B,$00,$00,$00,$00,$00,$00,$13,$12,$11,$10,$1F
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; track 1
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!byte $20,$2E,$2D,$2C,$2B,$2A,$29,$28,$27,$26,$25,$24,$23,$22,$21,$2F
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; track 2
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!byte $30,$3E,$3D,$3C,$3B,$3A,$39,$38,$37,$36,$35,$34,$33,$32,$31,$3F
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!byte $C0
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SD_DOS32
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; exit via JMP $B700
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!byte $00,$B7
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; track 0
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!byte $00,$00,$00,$00,$00,$BF,$BE,$BD,$BC,$BB,$BA,$B9,$B8,$B7
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!byte $C0
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SD_DOS32LO
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; exit via JMP $3700
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!byte $00,$37
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; track 0
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!byte $00,$00,$1C,$1B,$00,$3F,$3E,$3D,$3C,$3B,$3A,$39,$38,$37,$00
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; track 1
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!byte $1D,$00,$00,$29,$28,$27,$26,$25,$24,$23,$22,$21,$20,$1F,$1E,$00
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; track 2
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!byte $2A,$00,$00,$00,$35,$34,$33,$32,$31,$30,$2F,$2E,$2D,$2C,$2B,$00
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!byte $C0
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SD_RDOS13
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; exit via JMP $B300
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!byte $00,$B3
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; track 0
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!byte $00,$00,$00,$BD,$BC,$BB,$BA,$B9,$B8,$B7,$B6,$B5,$B4,$B3
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!byte $C0
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