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Add P5 Magic Number Disk Fields
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README.md
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README.md
@ -524,6 +524,16 @@ it comes from the P5 PROM ReadSector routine @ $C65C.
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On my //e it looks this:
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```asm
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P5.Buff = $26 ; 16-bit pointer to dest
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P5.SlotX16 = $2B ; i.e. $60 = Slot 6
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; Magic Numbers "disk nisk nibbles"
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ADDR_PROLOG_1 = $D5
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ADDR_PROLOG_2 = $AA
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ADDR_PROLOG_3 = $96
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DATA_PROLOG_3 = $AD
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ORG $C65C
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P5.ReadSector
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@ -532,23 +542,23 @@ On my //e it looks this:
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C65E:BD 8C C0 ^2 LDA DRIVE_DATA,X
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C661:10 FB BPL ^2 ;^ $C65E
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C663:49 D5 ^3 EOR #$D5 ; Address 1st Prologue Field
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C663:49 D5 ^3 EOR #ADDR_PROLOG_1
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C665:D0 F7 BNE ^2 ;^ $C65E
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C667:BD 8C C0 ^4 LDA DRIVE_DATA,X
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C66A:10 FB BPL ^4 ;^ $C667
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C66C:C9 AA CMP #$AA ; Address 2nd Prologue Field
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C66C:C9 AA CMP #ADDR_PROLOG_2
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C66E:D0 F3 BNE ^3 ;^ $C663
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C670:EA NOP
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C671:BD 8C C0 ^5 LDA DRIVE_DATA,X
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C674:10 FB BPL ^5 ;^ $C671
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C676:C9 96 CMP #$96 ; Address 3rd Prologue Field, NOTE: C=1 for $C68C !
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C676:C9 96 CMP #ADDR_PROLOG_3 ; NOTE: C=1 for $C68C !
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C678:F0 09 BEQ ^6 ;v $C683
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C67A:28 PLP ;Looking for Address or Data prologue?
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C67B:90 DF BCC ^0 ;^ $C65C
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C67D:49 AD EOR #$AD ; Prologue Data Field: 3rd
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C67D:49 AD EOR #DATA_PROLOG_3
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C67F:F0 25 BEQ ^10 ;v $C6A6
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C681:D0 D9 BNE ^0 ;^ $C65C
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C683:A0 03 ^6 LDY #$03 ; Read 3 nibbles: Vol,Track,Sec, skip Checksum
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