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refactor DOS 3.3 ID
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4am
parent
8a89f62674
commit
ff2af65bb8
145
src/id/dos33.a
145
src/id/dos33.a
@ -12,82 +12,99 @@
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;-------------------------------
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!zone {
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IDDOS33
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lda $08FE ; $08FE must be either $36 or $B6
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cmp #$36 ; (prevents matching on some
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beq .match0 ; Infocom disks that would
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cmp #$B6 ; otherwise match but then load
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beq .match0 ; boot1 over program space and crash)
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jmp .notd33boot0
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.match0
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lda #$00 ; match first $1C bytes of T00S00
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ldx #$00 ; against standard DOS 3.3 boot0
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ldy #$1C
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jsr compare
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!byte $01,$A5,$27,$C9,$09,$D0,$18,$A5
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!byte $2B,$4A,$4A,$4A,$4A,$09,$C0,$85
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!byte $3F,$A9,$5C,$85,$3E,$18,$AD,$FE
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!byte $08,$6D,$FF,$08
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bcc .maybe_d33_1
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jmp .notd33boot0
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.maybe_d33_1
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lda #$00 ; match more bytes of T00S00
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ldx #$1F ; against standard DOS 3.3 boot0
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ldy #$2B
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jsr compare
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!byte $AE
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!byte $FF,$08,$30,$15,$BD,$4D,$08,$85
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!byte $3D,$CE,$FF,$08,$AD,$FE,$08,$85
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!byte $27,$CE,$FE,$08,$A6,$2B,$6C,$3E
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!byte $00,$EE,$FE,$08,$EE,$FE,$08,$20
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!byte $89,$FE,$20,$93,$FE,$20,$2F,$FB
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;
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; $08FE must be either $36 or $B6 (prevents matching on some
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; Infocom disks that would otherwise match but then load
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; boot1 over program space and crash)
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;
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lda $08FE
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cmp #$36
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beq +
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cmp #$B6
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beq +
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sec
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rts
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;
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; Code at $0801 must be standard (with one exception)
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;
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+ lda #$00
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ldx #$00
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ldy #$4A
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jsr compare ; if T00,S00,$00 ==
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!byte $01
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!byte $A5,$27
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!byte $C9,$09
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!byte $D0,$18
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!byte $A5,$2B
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!byte $4A
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!byte $4A
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!byte $4A
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!byte $4A
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!byte $09,$C0
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!byte $85,$3F
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!byte $A9,$5C
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!byte $85,$3E
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!byte $18
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!byte $AD,$FE,$08
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!byte $6D,$FF,$08
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!byte WILDCARD ; will check these later
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!byte WILDCARD
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!byte WILDCARD
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!byte $AE,$FF,$08
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!byte $30,$15
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!byte $BD,$4D,$08
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!byte $85,$3D
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!byte $CE,$FF,$08
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!byte $AD,$FE,$08
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!byte $85,$27
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!byte $CE,$FE,$08
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!byte $A6,$2B
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bcc .maybe_d33_2
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jmp .notd33boot0
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.maybe_d33_2
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lda #$00 ; check sector order map
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!byte $6C,$3E,$00
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!byte $EE,$FE,$08
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!byte $EE,$FE,$08
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!byte $20,$89,$FE
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!byte $20,$93,$FE
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!byte $20,$2F,$FB
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!byte $A6,$2B
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bcs .exit
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;
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; Sector order map must be standard (no exceptions)
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;
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lda #$00
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ldx #$4D
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ldy #$10
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jsr compare
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jsr compare ; if T00,S00,$4D ==
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!byte $00,$0D,$0B,$09,$07,$05,$03,$01
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!byte $0E,$0C,$0A,$08,$06,$04,$02,$0F
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bcc .maybe_d33_3
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jmp .notd33boot0
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.maybe_d33_3
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lda #$00 ; match 3 final bytes of T00S00
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ldx #$1C ; against standard DOS 3.3 boot0
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bcs .exit
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;
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; Minor variant (e.g. Terrapin Logo 3.0) jumps to $08F0 and back
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; but is still safe to trace. Check for this jump and match
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; the code at $08F0 exactly.
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;
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lda #$00
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ldx #$1C
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ldy #$03
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jsr compare
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jsr compare ; if T00,S00,$1C ==
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!byte $8D,$FE,$08
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bcs .maybe_d33_4
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jmp .founddos33
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bcc .exit ; standard code at $081C -> success
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.maybe_d33_4
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lda #$00 ; minor variation (e.g. Terrapin
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ldx #$1C ; Logo 3.0) jumps to $08F0 and
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ldy #$03 ; back, but still safe to trace
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jsr compare
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!byte $4C,$F0,$08
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bcc .maybe_d33_5
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jmp .notd33boot0
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lda #$00
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ldx #$1C
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ldy #$03
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jsr compare ; if T00,S00,$1C ==
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!byte $4C,$F0,$08; JMP $08F0
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bcs .exit ; unknown code at $081C -> failure
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.maybe_d33_5
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lda #$00
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ldx #$F0
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ldy #$09
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jsr compare
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!byte $8D,$FE,$08,$EE,$F3,$03,$4C,$1F
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!byte $08
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bcs .notd33boot0
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jsr compare ; if T00,S00,$F0 ==
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!byte $8D,$FE,$08
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!byte $EE,$F3,$03
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!byte $4C,$1F,$08
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; bcs .exit ; unknown code at $08F0 -> failure
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.founddos33
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clc
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!byte $24 ; hide next SEC
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.notd33boot0
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sec
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.exit
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rts
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}
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@ -33,8 +33,7 @@ IDBootloader
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bcc ++
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cmp #$05
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beq ++
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+
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- jmp UseUniversal
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+ jmp UseUniversal
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++
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;
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@ -46,31 +45,6 @@ IDBootloader
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ldy #$01
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jsr CopyMemory
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lda #$00
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ldx #$00
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ldy #$4A
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jsr compare ; if T00,S00,$00 ==
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; This needs to be pretty strict because, if it matches,
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; we're going to patch the sector and trace it to capture
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; the RWTS.
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!byte $01,$A5,$27,$C9,$09,$D0,$18,$A5
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!byte $2B,$4A,$4A,$4A,$4A,$09,$C0,$85
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!byte $3F,$A9,$5C,$85,$3E,$18,$AD,$FE
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!byte $08,$6D,$FF,$08,$8D,$FE,$08,$AE
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!byte $FF,$08,$30,$15,$BD,$4D,$08,$85
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!byte $3D,$CE,$FF,$08,$AD,$FE,$08,$85
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!byte $27,$CE,$FE,$08,$A6,$2B,$6C,$3E
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!byte $00,$EE,$FE,$08,$EE,$FE,$08,$20
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!byte $89,$FE,$20,$93,$FE,$20,$2F,$FB
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!byte $A6,$2B
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ldx #TRUE
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bcc .boot0
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ldx #FALSE
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.boot0
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stx gIsBoot0
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lda #$00
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ldx #$00
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ldy #$05
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@ -99,7 +73,7 @@ IDBootloader
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; The wildcard in 7th position catches alternate jump
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; addresses (e.g. Wizardry I, Sundog Frozen Legacy)
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!byte $01,$E0,$60,$F0,$03,$4C,$97,$08
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!byte $01,$E0,$60,$F0,$03,$4C,WILDCARD,$08
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ldx #TRUE
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bcc .pascal
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lda #$00
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@ -122,6 +96,8 @@ IDBootloader
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;
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jsr IDDOS33
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bcs .notdos33
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lda #TRUE
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sta gIsBoot0
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lda #s_dosb0
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jsr PrintByID
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jmp TraceDOS33
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