Usable Magic for all Characters

author: B-Run
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This patch gives every character a usable magic list to pull from, as well as allows each character to learn magic via espers/equipment. All of the magic lists are shared with the first twelve actors (Terra and Co.). On the flipside, I overwrote Gogo's magic code in order to create this patch, meaning Gogo no longer learns everyone's magic.

Actors above 0B will share the magic lists with one of the other characters. Notable actors who can now learn Magic:
-Gogo shares a magic list and learning with Terra.
-Umaro shares a magic list and learning with Locke.
-Bannon shares a magic list and learning with Cyan.
-Leo shares a magic list and learning with Shadow.
-Wedge shares a magic list and learning with Relm.
-Vicks shares a magic list and learning with Setzer.
-Kefka shares a magic list and learning with Sabin, Celes, Strago, Relm, or Setzer (depending on which instance of Kefka is used).

Note: This patch does not add magic to each actors menu, you must do that yourself with an editor. This patch also does not allow all actors to be reequipped. This is only for magic lists.

Here are the changes in the code:

Code:

This is where the magic happens, literally. This is where Gogo's magic population used to occur.
C3/50C4:    C90C        CMP #$0C
C3/50C6:    9006        BCC $50CE     (branch if less than #$0C)
C3/50C8:    E90C        SBC #$0C      (else, subtract #$0C)
C3/50CA:    C90C        CMP #$0C
C3/50CC:    B0FA        BCS $50C8     (if still greater than #$0C, subtract again)
C3/50CE:    60        RTS

This is the subroutine when called from the C2 bank.
C3/50CF:    C90C        CMP #$0C
C3/50D1:    9006        BCC $50D9     (branch if less than #$0C)
C3/50D3:    E90C        SBC #$0C      (else, subtract #$0C)
C3/50D5:    C90C        CMP #$0C
C3/50D7:    B0FA        BCS $50D3     (if still greater than #$0C, subtract again)
C3/50D9:    6B        RTS

C3/50DA:    EA        NOP          (Filling out the rest of Gogo's old magic block)
...
C3/50EB:    EA        NOP

Now for how it gets used.

Code:

Determine if a character actually knows magic [MENU]
C3/0D2B:    AD691A      LDA $1A69      (from C3/0CB7)
C3/0D2E:    0D6A1A      ORA $1A6A
C3/0D31:    0D6B1A      ORA $1A6B
C3/0D34:    0D6C1A      ORA $1A6C
C3/0D37:    D027        BNE $0D60      (branch if you have at least one esper)
C3/0D39:    A667        LDX $67
C3/0D3B:    7B          TDC
C3/0D3C:    BD0000      LDA $0000,X    (character ID)
C3/0D3F:    20C450        JSR $50C4      (Reduce character ID)
C3/0D42:    EA        NOP
C3/0D43:    EA        NOP
C3/0D44:    EA        NOP
C3/0D45:    8D0242      STA $4202      (reduced actor ID as multiplier A)
C3/0D48:    A936        LDA #$36
C3/0D4A:    8D0342      STA $4203      (#$36 as multiplier B)
C3/0D4D:    A03600      LDY #$0036     (TAY?)
C3/0D50:    AE1642      LDX $4216      (load character * spell total)
C3/0D53:    BD6E1A      LDA $1A6E,X    (load spell at X)
C3/0D56:    C9FF        CMP #$FF       (learned it?)
C3/0D58:    F006        BEQ $0D63      (branch if so)
C3/0D5A:    E8          INX
C3/0D5B:    88          DEY
C3/0D5C:    D0F5        BNE $0D56      (branch if we haven't checked every spell)
C3/0D5E:    18          CLC            (used by C3/0C6C, says that this character doesn't know magic)
C3/0D5F:    60          RTS

C3/0D60:    38          SEC            (flag MP as ok to display)
C3/0D61:    60          RTS
C3/0D62:    EA        NOP
C3/0D63:    EA        NOP
C3/0D64:    EA        NOP

Code:

Get spell's learned amount [MENU]
C3/50A2:    85E0        STA $E0
C3/50A4:    20DD4E      JSR $4EDD
C3/50A7:    B90000      LDA $0000,Y
C3/50AA:    20C450        JSR $50C4 (Reduce character ID)
C3/50AD:    8D0242      STA $4202
C3/50B0:    A936        LDA #$36
C3/50B2:    8D0342      STA $4203
C3/50B5:    7B          TDC
C3/50B6:    A5E0        LDA $E0
C3/50B8:    C220        REP #$20      (16 bit memory/accum.)
C3/50BA:    6D1642      ADC $4216
C3/50BD:    AA          TAX
C3/50BE:    E220        SEP #$20      (8 bit memory/accum.)
C3/50C0:    BD6E1A      LDA $1A6E,X
C3/50C3:    60          RTS

Code:

Relevant code for looking up magic [BATTLE]
C2/56C9: BD D8 3E     LDA $3ED8,X  (character ID)
C2/56CC: 22CF50C3     JSR $C3/50CF (reduce character ID)
C2/56D0: C8           INY
C2/56D1: C8           INY          (Y = 2)
C2/56D2: EA           NOP
C2/56D3: EA          NOP
C2/56D4: C8           INY
C2/56D5: C8           INY          (Y = 4)
C2/56D6: EB           XBA
C2/56D7: A9 36        LDA #$36
C2/56D9: 20 81 47     JSR $4781
C2/56DC: C2 21        REP #$21     (Set 16-bit A, clear Carry)
C2/56DE: 69 6E 1A     ADC #$1A6E
C2/56E1: 85 F0        STA $F0

Code:

Learning Magic [BATTLE]
C2/5E59: B9 D8 3E     LDA $3ED8,Y (Which character it is)
C2/5E5C: 22CF50C3     JSR $C3/50CF(reduce character ID)
C2/5E60: 20 83 62     JSR $6283   (Stores address for spells known by character in $F4)
C2/5E63: BE 10 30     LDX $3010,Y (get offset to character info block)
C2/5E66: 5A           PHY
C2/5E67: 20 EF 5F     JSR $5FEF   (Cursed Shield check)
C2/5E6A: BD 1E 16     LDA $161E,X (Esper equipped)
C2/5E6D: 30 03        BMI $5E72   (Branch if no esper equipped)
C2/5E6F: 20 2A 60     JSR $602A   (Learn spells taught by esper)
C2/5E72: 7A           PLY
C2/5E73: 88           DEY
C2/5E74: 88           DEY
C2/5E75: 10 9C        BPL $5E13   (Check next character)

Code:

Populating battle magic list
C2/5589: BD D8 3E     LDA $3ED8,X  (Character ID)
C2/558C: 22 CF 50 C3  JSR $C3/50CF (Reduce character ID)
C2/5590: EB           XBA
C2/5591: A9 36        LDA #$36
C2/5593: 20 81 47     JSR $4781
C2/5596: C2 21        REP #$21
C2/5598: 69 6E        ADC #$6E
C2/559A: 1A           INC
C2/559B: F0           STA $F0     (Characters magic list address)

Thanks to Madsiur for help finding and understanding code and Angelo26 for the disassemblies of the Battle and Menu banks and pointing me to a patch maker!

Feel free to use this in your own hacks, simply give credit where credit is due. Please contact me if you find any bugs. Hope this helps!