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Michaelangel007
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README.md
124
README.md
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@ -1345,59 +1345,109 @@ Someone even patched the backup utility !
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* 
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We will discuss when we remove the copy protection ourselves.
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We will discuss this more when we remove the copy protection ourselves.
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# Boot Tracing Stage 3 $BE00
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The boot sector code @ $087E calls Stage 4 $BE00:
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The boot sector code @ $087E calls Stage 3 $BE00:
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```asm
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087E:4C 00 BE JMP ExecBoot3 ;
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087E:4C 00 BE JMP ExecBoot3
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```
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This is the disaassembly
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This is the disassembly:
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```asm
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ExecBoot3:
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BE00:4C 06 BE JMP Main
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BE03:4C AD BE JMP DoNibbleCheck2 ; Nibble Check #2: $D4,$D5,$DE,$A5,$xx,$yy,$E5,$AA
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BE00:4C 06 BE JMP Main
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BE03:4C AD BE JMP DoNibbleCheck2 ; Nibble Check #2: $D4,$D5,$DE,$A5,$xx,$yy,$E5,$AA
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Main:
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BE06:20 16 BF JSR Verify64K
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BE09:20 75 BE JSR $BE75
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BE0C:A0 58 LDY #<$FF58
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BE0E:A9 FF LDA #>$FF58
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BE10:84 36 STA CSW+0 ; CSWL = $36, Char Out Vector (Function Pointer)
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BE12:85 37 STA CSW+1
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BE14:A0 1F LDY #<NewKSW
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BE16:A9 BE LDA #>NewKSW
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BE18:84 38 STY KSW+0 ; KSWL = $38, Char In Vector (Function Pointer)
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BE1A:85 39 STA KSW+1
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BE1C:4C 00 E0 JMP BASIC ; BASIC Cold Start
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BE06:20 16 BF JSR Verify64K
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BE09:20 75 BE JSR $BE75
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BE0C:A0 58 LDY #<$FF58
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BE0E:A9 FF LDA #>$FF58
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BE10:84 36 STA CSW ; CSWL = $36, Char Out Vector (Function Pointer)
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BE12:85 37 STA CSW+1
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BE14:A0 1F LDY #<NewKSW
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BE16:A9 BE LDA #>NewKSW
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BE18:84 38 STY KSW ; KSWL = $38, Char In Vector (Function Pointer)
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BE1A:85 39 STA KSW+1
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BE1C:4C 00 E0 JMP BASIC ; BASIC Cold Start
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NewKSW:
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BE1F:91 28 STA (BAS),Y ; BASL = $28
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BE21:20 89 FE JSR SETKBD ; SETKBD = $FE89
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BE24:20 93 FE JSR SETVID ; SETVID = $FE93
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BE27:A9 16 LDA #$16 ; First Track to Load
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BE29:8D 33 BE STA NextTrack+1 ; *** SELF MODIFYING ***
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BE2C:20 09 B0 JSR RWTS_Seek
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BE2F:A9 08 LDA #$08 ; DestAddr
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BE1F:91 28 STA (BAS),Y ; BASL = $28
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BE21:20 89 FE JSR SETKBD ; SETKBD = $FE89
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BE24:20 93 FE JSR SETVID ; SETVID = $FE93
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BE27:A9 16 LDA #$16 ; First Track to Load
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BE29:8D 33 BE STA BE.NextTrack+1 ; *** SELF MODIFYING ***
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BE2C:20 09 B0 JSR RWTS_Seek
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BE2F:A9 08 LDA #$08 ; DestAddr
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NextPage:
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BE31:48 PHA ;+ Save DestAddr
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NextTrack:
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BE32:A0 00 LDY #$00 ; *** SELF-MODIFIED @ $BE27 ***
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BE34:EE 33 BE INC $BE33 ; *** SELF MODIFYING ***
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BE37:20 00 B0 JSR RTWS_LoadTrack
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BE3A:68 PLA ; Restore DestAddr
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BE3B:18 CLC
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BE3C:69 18 ADC #$18 ; We initially loaded at $0800
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BE3E:29 F0 AND #$F0 ; Force to load at start-of-page $2x00, $3x00, etc
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BE40:C9 A1 CMP #$A1 ; Load entire $Ax00 page then stop
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BE42:90 ED BCC NextPage ;^ $BE31
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BE31:48 PHA ;+ Save DestAddr
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BE.NextTrack:
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BE32:A0 00 LDY #$00 ; *** SELF-MODIFIED @ $BE27 @ $BE34 ***
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BE34:EE 33 BE INC BE.NextTrack+1 ; *** SELF MODIFYING ***
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BE37:20 00 B0 JSR RTWS_LoadTrack
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BE3A:68 PLA ; Restore DestAddr
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BE3B:18 CLC
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BE3C:69 18 ADC #$18 ; We initially loaded at $0800
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BE3E:29 F0 AND #$F0 ; Force to load at start-of-page $2x00, $3x00, etc
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BE40:C9 A1 CMP #$A1 ; Load entire $Ax00 page then stop
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BE42:90 ED BCC NextPage ;^ $BE31
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BE44:AC 00 08 LDY $0800
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BE44:AC 00 08 LDY $0800
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BE47:AD 04 08 LDA $0804
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BE4A:84 AF STY $AF
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BE4C:85 B0 STA $B0
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BE4E:84 69 STY $69
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BE50:85 6A STA $6A
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BE52:A9 00 LDY #$00
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BE54:8D 00 08 STA $0800
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BE57:8D 04 08 STA $0804
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BE75:A2 20 LDX #$20
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BE5A:AD 00 C0 LDA KEYBOARD ; Key pressed?
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BE5D:C9 9B CMP #$1B + $80 ; ESC pressed?
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BE5F:F0 07 BEQ LoadBackup ;v $BE68
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BE61:A6 FD LDX $FD
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BE63:86 43 STX $43
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BE65:4C 00 40 JMP Main.2
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LoadBackup:
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BE68:2C 10 C0 BIT KEYSTROBE
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BE6B:A0 20 LDY #$20 ; Y = Track of Backup Utility
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BE6D:A9 08 LDA #>Main.Backup ; A = Address
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BE6F:20 00 B0 JSR RWTS_LoadTrack
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BE72:4C 00 08 JMP Main.Backup
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BE75:A2 20 LDX #$20 ; Double Duty: DstAddr, and Num Pages
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BE77:8E 7F BE STX _ClearHGR+2 ; *** SELF-MODIFYING @ $BE7D
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BE7A:A0 00 LDY #$00
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BE7C:98 TYA
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_ClearHgr
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BE7D:99 00 20 STA $2000,Y ; *** SELF_MODIFIED by $BE77, $BE83
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BE80:C8 INy
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BE81:D0 FA BNE _ClearHgr ;^ $BE7D
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BE83:EE 7F BE INC _ClearHGR+2
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BE86:CA DEX
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BE87:D0 F4 BNE _ClearHgr
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BE89:AD 52 C0 LDA $C052
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BE8C:AD 57 C0 LDA $C057
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BE8F:AD 50 C0 LDA $C050
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BE92:A9 17 LDA #$17 ; Logo on Track $17
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BE94:20 09 B0 JSR RWTS_Seek
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BE97:A9 20 LDA #$20 ; A = Addr = HGR top half
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BE99:A0 17 LDY #$17 ; Y = Track Logo Top
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BE9B:20 00 B0 JSR RWTS_LoadTrack
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BE9E:A9 30 LDA #$30 ; A = Addr = HGR bottom half
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BEA0:A0 18 LDY #$18 ; Y = Track Logo Bot
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BEA2:20 00 B0 JSR RWTS_LoadTrack
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RTS
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```
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