Apple-2-SW/apple2_fantavision_reloaded
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Add stupid kids

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Michaelangel007 2017-03-24 09:03:55 -07:00
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README.md
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@ -10,6 +10,7 @@
* Boot Tracing Stage 1b
* RWTS
* Boot Tracing Stage 2
* Stupid Kids and their Graffiti
* Boot Tracing Stage 3
* Time to go Loco, er, Logo
* Logo -- no, not the language
@ -1297,6 +1298,9 @@ There are many different ways to remove the protection.
The simpliest is to format track $22 normally,
and modify $B500 to load them in.
## Stupid Kids and their Graffiti
That is exactly what Black Bag's "Kracked" version of Fantavision does.
* ![Black Bag Krack](pics/logo_blackbag.png)
@ -1309,29 +1313,33 @@ On Track $15, Sector $5 @ $B500 it uses:
to read two sectors on a normal formatted track $22.
_That_ code looks like this:
```asm
ReadBoot3:
B500:A9 22 LDA #$22 ; Nibble Check Track been converted to normal sector
B502:20 09 B0 JSR RWTS_Seek ;
B505:A2 60 LDX #$60 ; BUG! Hard-Coded to Drive in Slot 6 !
FindSector0: ; Should be: LDX rwts_SlotX16 -> LDX $FD
B507:20 26 B1 JSR RWTS_Prologue ;
B50A:A5 E3 LDA rwts_Sector_Have ;
B50C:C9 00 CMP #$00 ; Logical Sector $0 -> Physical Sector $0
B50E:D0 F7 BNE FindSector0 ;
B510:85 E6 STA rwts_LoadAddr ; Double Duty
B512:A9 BE LDA #$BE ; Dest Addr = $BE00
B514:85 E7 STA rwts_LoadAddr+1 ;
B516:20 11 B0 JSR RWTS_ReadSector ;
FindSectorD: ;
B519:20 26 B1 JSR RWTS_Prologue ;
B51C:A5 E3 LDA rwts_Sector_Have ;
B51E:C9 0D CMP #$0D ; Logical Sector $1 -> Physical Sector $D
B520:D0 F7 BNE FindSectorD ;
B522:E6 E7 INC rwts_LoadAddr+1 ; DestAddr += $0100
B522:20 11 B0 JSR RWTS_ReadSector ;
B527:18 CLC ; Signal $087C Nibble Check = PASS
B528:60 RTS ;
```
LDA #$22 ; B500:A9 22 ; Nibble Check Track been converted to normal sector
JSR RWTS_Seek ; B502:20 09 B0
LDX #$60 ; B505:A2 60 ; BUG! Hard-Coded to Drive in Slot 6 !
FindSector0: ; Should be: LDX RWTS_SLOTx16 -> LDX $FD
JSR RWTS_Prologue ; B507:20 26 B1
LDA RWTS_HAVE_SEC ; B50A:A5 E3 ; Current sector under disk head
CMP #$00 ; B50C:C9 00 ; Look for sector $0
BNE FindSector0 ; B50E:D0 F7
STA $E6 ; B510:85 E6
LDA #$BE ; B512:A9 BE ; Dest Addr = $BE00
STA $E7 ; B514:85 E7
JSR RWTS_ReadSec ; B516:20 11 B0
FindSectorD:
JSR RWTS_Prologue ; B519:20 26 B1
LDA RWTS_HAVE_SEC ; B51C:A5 E3
CMP #$0D ; B51E:C9 0D ; Look for sector $D
BNE FindSectorD ; B520:D) F7
INC $E7 ; B522:E6 E7
JSR RWTS_ReadSec ; B522:20 11 B0
CLC ; B527:18 ; Signal $087C Nibble Check = PASS
RTS ; B528:60
```
Looks like this was an amateur rush job -- if you try to boot this version
in Slot 5 it will fail.
Someone even patched the backup utility !