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Merge pull request #70 from peterferrie/master
verify Infocom 18-sector format
This commit is contained in:
4am
GitHub
commit
f1160b90e0
@ -48,6 +48,16 @@
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; instead of falling back to built-in RWTS
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; compile-time flag, no way to change at runtime
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;gIs13Sector
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!byte FALSE ; 0=true, 1=false
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; reset before each operation
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; set in IDBootFailure() after reading T00
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;gIsInfocom18
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!byte FALSE ; 0=true, 1=false
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; reset before each operation
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; set in IDBootFailure() after reading T00
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;gMECCFastloadType
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!byte 00 ; int
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; reset before each operation
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@ -99,8 +99,12 @@ gIsPanglosDOS = gIsAdvent-$01 ; byte
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gIsDavidson = gIsPanglosDOS-$01 ; byte
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gIsRDOS13 = gIsDavidson-$01 ; byte
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;LASTFILTER ; add new gIs* above this line
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;gIsInfocom18 is a special case whose ID is not in the regular inspection path
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gIsInfocom18 = gIsRDOS13-$01 ; byte
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;gIs13Sector is a special case whose ID is not in the regular inspection path
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gIs13Sector = gIsInfocom18-$01 ; byte
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;gMECCFastloadType is a special case integer whose default value cannot be #FALSE
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gMECCFastloadType = gIsRDOS13-$01 ; byte
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gMECCFastloadType = gIs13Sector-$01 ; byte
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gOnAClearDayYouCanReadForever = gMECCFastloadType-$01 ; byte
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gUsingRAMDisk = gOnAClearDayYouCanReadForever-$01 ; byte
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@ -168,6 +172,8 @@ ConstructStandardDelivery = jConstructStandardDelivery
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!warn "gIsPanglosDOS=",gIsPanglosDOS
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!warn "gIsDavidson=",gIsDavidson
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!warn "gIsRDOS13=",gIsRDOS13
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!warn "gIsInfocom18=",gIsInfocom18
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!warn "gIs13Sector=",gIs13Sector
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!warn "gOnAClearDayYouCanReadForever=",gOnAClearDayYouCanReadForever
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!warn "gUsingRAMDisk=",gUsingRAMDisk
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!warn "gRAMDiskRef=",gRAMDiskRef
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@ -18,6 +18,21 @@ IDBootloader
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bne -
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stx gMECCFastloadType
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stx gLastTrack
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lda gIsInfocom18
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bne .check13
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lda #s_infocom18
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jsr PrintByID
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jmp UseUniversal
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.check13
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lda gIs13Sector
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bne .sanity
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lda #s_13sector
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jsr PrintByID
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jmp UseUniversal
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.sanity
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;
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; Quick sanity check -- only recognized values for $0800
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; are 1 or 2 for regular disks, and 5 for possible Electronic Arts.
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@ -288,3 +303,195 @@ PrereadT00Partial
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.exit
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rts
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}
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;-------------------------------
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; IDBootFailure
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; main entry point to identify the bootloader
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; when the initial read failed
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; identifies Infocom 18-sector side B disks
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; and pure 13-sector disks
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; doubles as Infocom verification routine after ID
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; written by qkumba
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;
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; in: nothing
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; out: carry set if we can't ID it
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;-------------------------------
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!zone {
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IDBootFailure
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VerifyInfocom18
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lda $C0E9
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.retry13
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ldx #$1A ; the length of a track
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ldy #0
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--- iny
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bne +
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dex
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bne +
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.no sec
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lda $C0E8
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rts
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.badsect
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lda gIsInfocom18
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beq .no ; if in Infocom mode already then we have a true failure
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bne .retry13 ; otherwise, try to identify 13-sector instead
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; the issue being that both have a D5 AA AD sequence
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+
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- lda $C0EC
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bpl -
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-- cmp #$D5
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bne ---
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- lda $C0EC
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bpl -
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cmp #$AA
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bne --
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- lda $C0EC
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bpl -
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cmp #$B5 ; 13-sector only
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beq .build13
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cmp #$AD
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bne --
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- lda $C0EC
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bpl -
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nop
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nop ; ignore half of 4x4 track number
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- lda $C0EC
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bpl - ; ignore half of 4x4 track number
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lda #$12 ; all 18 sectors when in verify mode
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ldx gIsInfocom18
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beq .setcount
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lda #$01 ; only one sector when in ID mode
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.setcount
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sta tmp ; sector counter
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lda #$00
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-- ldy #$56
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- ldx $C0EC
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bpl -
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eor $BA00,x ; from universal RWTS
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dey
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bne -
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- ldx $C0EC
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bpl -
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eor $BA00,x ; from universal RWTS
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iny
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bne -
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- ldx $C0EC
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bpl -
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eor $BA00,x ; from universal RWTS
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bne .badsect
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dec tmp
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bne --
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sta gIsInfocom18
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.checkmode
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bit gMode ; verify-mode already?
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bpl + ; yes, continue
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lda #%00000000 ;
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sta gMode ; no, switch to verify-mode
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lda #s_toverify
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jsr PrintByID ; and say so
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+ clc ; all clear
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lda $C0E8
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rts
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;build 5-and-3 decoding table
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;for 13-sector support
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.build13
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ldx #$00
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ldy #$AB
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- tya
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sta tmp
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lsr
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ora tmp
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cmp #$FF
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bne +
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cpy #$D5
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beq +
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txa
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sta $800,y
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inx
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+ iny
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bne -
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sty gIs13Sector
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beq .checkmode ; always taken
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read13
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lda $C0E9
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lda #$1C ; retry count
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sta tmp
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.readaddr
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dec tmp
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bmi .badread
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clc
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ldx #$02 ; 512 nibbles
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ldy #0
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.readdata
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php
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--- iny
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bne +
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dex
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beq .badread
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+
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- lda $C0EC
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bpl -
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-- cmp #$D5
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bne ---
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- lda $C0EC
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bpl -
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cmp #$AA
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bne --
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- lda $C0EC
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bpl -
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cmp #$B5
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bne +
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ldy #$03
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-- lda $C0EC
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bpl --
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rol
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sta $3C
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- lda $C0EC
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bpl -
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and $3C
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dey
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bne --
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plp
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cmp gSector
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bne .readaddr
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bcs .readdata
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+ plp
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bcc .readaddr
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eor #$AD
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bne read13
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-- ldy #$9A
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- ldx $C0EC
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bpl -
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eor $800,x
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dey
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bne -
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- ldx $C0EC
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bpl -
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eor $800,x
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iny
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bne -
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- ldx $C0EC
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bpl -
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eor $800,x
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cmp #$01 ; set carry if non-zero
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!byte $24
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.badread
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sec
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lda $C0E8
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rts
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}
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@ -254,6 +254,8 @@ Reaction
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sta gTriedUniv
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sta gSaidWriting
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sta gIsProtDOS
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sta gIsInfocom18
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sta gIs13Sector
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lda #$00
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sta gTrack
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sta gSector
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@ -274,6 +276,8 @@ Reaction
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jsr IgnoreAddressChecksum
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jsr ReadSector
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bcc +
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jsr IDBootFailure ; /src/id/inspect0
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bcc +
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lda #s_fail
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jsr PrintByID
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lda #s_fatal0000
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@ -339,6 +343,17 @@ UseUniversal
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jsr PatchUniversalRWTSForOrigin
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bmi ReadWithRWTS ; always branches
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;
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; On pure 13-sector disks, we just hijack the read routine to perform a
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; verification instead.
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;
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+ lda gIs13Sector
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bne +
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lda #<read13
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sta jCallRWTS+1
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lda #>read13
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sta jCallRWTS+2
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bne ReadWithRWTS ; always branches
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;
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; On other disks that use the universal RWTS for the entire disk, we use
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; an adaptive RWTS that accepts any epilogue on the first sector but then
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; enforces all other sectors to have the same epilogue.
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@ -368,18 +383,30 @@ ReadWithRWTS
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lda #$22
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jsr ChangeTrackNW
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lda #$0F
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jsr ChangeSector
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ldx gIs13Sector
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bne +
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lda #$0C
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+ jsr ChangeSector
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lda #<T22S0F
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sta checksector+1
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lda #>T22S0F
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sta checksector+2
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.read
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lda KEY
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bpl checksector
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bpl .checkinfocom
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bit STROBE
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cmp #$e0 ;ignore backtick (MAME debug break)
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beq checksector
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beq .checkinfocom
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jmp Cancel
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.checkinfocom
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lda gIsInfocom18
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bne checksector
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jsr VerifyInfocom18
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bcc .passtrack
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jmp FatalError
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.passtrack
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jmp .prevtrack
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checksector
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lda $FFFF ; status of current sector in sector map (modified above)
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pha
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@ -387,10 +414,8 @@ checksector
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bcc +
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cmp #kSectorCustomLast
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bcs +
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jsr PreReadSector
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tax
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pla
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txa
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jsr PreReadSector
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pha ; replace status (on stack) with new status returned from PreReadSector
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+ cmp #kSectorIgnore ; skip this sector?
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beq nextsector
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@ -406,8 +431,11 @@ checksector
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; If we just got to this track, check for whole-track protections.
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;
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ldx #$0F ;16-sector
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lda gIs13Sector
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beq .expect13
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lda gIsDOS32
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bne +
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.expect13
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ldx #$0C ;13-sector
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+ cpx gSector
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bne .checkoptional
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@ -484,7 +512,10 @@ nextsector
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jmp .read
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.prevtrack
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lda #$0F
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jsr ChangeSector
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ldx gIs13Sector
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bne +
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lda #$0C
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+ jsr ChangeSector
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lda gTrack
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sec
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sbc #$01
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@ -123,6 +123,9 @@ StringTable
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!word .rdos13
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!word .ssi
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!word .aacount
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!word .infocom18
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!word .toverify
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!word .sector13
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;
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; Text can contain substitution strings, which
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; are replaced by current values at runtime. Each
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@ -148,7 +151,7 @@ StringTable
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; can be set directly before calling PrintByID.
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;
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.header
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!text "Passport by 4am 2018-10-14",$00
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!text "Passport by 4am 2018-12-29",$00
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.mainmenu
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!text "________________________________________",$8D,$8D,$8D,$8D,$8D,$8D,$8D
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!text " "
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@ -456,4 +459,10 @@ StringTable
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!text "T%t,S%0 Found SSI protection check",$8D,$00
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.aacount
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!text "T%t,S%0 Found AA nibble count",$8D,$00
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.infocom18
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!text "T00,S00 Found Infocom 18-sector format",$8D,$00
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.toverify
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!text "Switching to verify-only mode",$8D,$00
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.sector13
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!text "T00,S00 Found 13-sector format",$8D,$00
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}
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@ -109,4 +109,7 @@ s_davidson = $67
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s_rdos13 = $68
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s_ssi = $69
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s_aacount = $6A
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STRINGCOUNT = $6B
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s_infocom18 = $6B
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s_toverify = $6C
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s_13sector = $6D
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STRINGCOUNT = $6E
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