Zelda Optimum (MMC5) disassembly

//**********************************************
// MMC1 to MMC5 hack for Zelda 1 (by RetroRain)
//**********************************************

bank 0;     // HEADER change
org $8004   // 0x00004
    db $40,$80,$52

org $8000   // 0x00010
    lda.b #$02
    sta.w $5101
    lda.b #$50
    sta.w $5105
    lda.b #$00
    sta.w $5113
    lda.b #$0F
    sta.w $5015
    lda.b #$FE
    sta.w $5117
    lda.b #$00
    sta.w $5127
    sta.w $5130
    ldx.b #$00
lbl1:
    lda.w $8034,X
    sta.w $0100,X
    inx
    cpx.b #$06
    bne lbl1
    lda.b #$00
    sta.w $2000
    rts

    db $00,$01,$02,$03,$02,$03

org $BF7B   // 0x03F8B
    fill $15,nop

org $BF98   // 0x03FA8
    fill $13,nop

org $BFAC   // 0x03FBC
    jsr $FF43
    fill $10,nop

//---------------------------

bank 1;
org $8DB4   // 0x04DC4
    fill $1108,$00

org $BF7B   // 0x07F8B
    fill $15,nop

org $BF98   // 0x07FA9
    fill $13,nop

org $BFAC   // 0x07FBC
    jsr $FF43
    fill $10,nop

//---------------------------

bank 2;
org $807F   // 0x0808F
    ldx.b #$00
lbl2:
    lda.w $8092,X
    sta.w $0100,X
    inx
    cpx.b #$06
    bne lbl2
    lda.b #$00
    sta.w $0607
    rts

    db $00,$04,$05,$06,$05,$06

org $8098   // 0x080A8
    fill $0EC6,$00

org $A5DF   // 0x0A5EF
    jsr $807F
    nop
    nop

org $BF7B   // 0x0BF8B
    fill $15,nop

org $BF98   // 0x0BFA8
    fill $13,nop

org $BFAC   // 0x0BFBC
    jsr $FF43
    fill $10,nop

//---------------------------

bank 3;
org $8065   // 0x0C075
    dw $811B

org $811B   // 0x0C12B
    ldx.b #$00
lbl3:
    lda.w $8149,X
    sta.w $0102,X
    inx
    cpx.b #$04
    bne lbl3
    ldx.b $16
    lda.w $062D,X
    beq lbl4
    jmp $813D
lbl4:
    ldx.b $10
    lda.w $814C,X
    sta.w $0101
    jmp $8145
    ldx.b $10
    lda.w $8155,X
    sta.w $0101
    jsr $8080
    rts

    db $08,$09,$08,$09,$07,$07,$0A,$0B
    db $0C,$0B,$07,$0A,$0D,$07,$07,$0A
    db $0B,$0C,$0B,$07,$0A,$0D,$00,$00

org $815F   // 0x0C16F
    fill $2A78,$00

org $BF7B   // 0x0FF8B
    fill $15,nop

org $BF98   // 0x0FFA8
    fill $13,nop

org $BFAC   // 0x0FFBC
    jsr $FF43
    fill $10,nop

//---------------------------

bank 4;
org $BF7B   // 0x13F8B
    fill $15,nop

org $BF98   // 0x13FA8
    fill $13,nop

org $BFAC   // 0x13FBC
    jsr $FF43
    fill $10,nop

//---------------------------

bank 5;
org $859D   // 0x145AD
    ldx.b #$00
lbl5:
    lda.w $85AE,X
    sta.w $0100,X
    inx
    cpx.b #$06
    bne lbl5
    jsr $EBA3
    rts

    db $00,$04,$05,$06,$05,$06

org $B1D3   // 0x171E3
    dw $FFCE

org $B548   // 0x17558
    dw $859D

org $BF7B   // 0x17F8B
    fill $15,nop

org $BF98   // 0x17FA8
    fill $13,nop

org $BFAC   // 0x17FBC
    jsr $FF43
    fill $10,nop

//---------------------------

bank 6;
org $BF7B   // 0x1BF8B
    fill $15,nop

org $BF98   // 0x1BFA8
    fill $13,nop

org $BFAC   // 0x1BFBC
    jsr $FF43
    fill $10,nop

//---------------------------

bank 7;
org $C000
    fill $FFFF,$00  // 0x1C010
    fill $FFFF,$00  // 0x2C00F
    fill $FFFF,$00  // 0x3C00E
    fill $FFFF,$00  // 0x4C00D
    fill $FFFF,$00  // 0x5C00C
    fill $FFFF,$00  // 0x6C00B
    fill $FFFF,$00  // 0x7C00A
    fill $FFFF,$00  // 0x8C009
    fill $FFFF,$00  // 0x9C008
    fill $FFFF,$00  // 0xAC007
    fill $FFFF,$00  // 0xBC006
    fill $FFFF,$00  // 0xCC005
    fill $FFFF,$00  // 0xDC004
    fill $FFFF,$00  // 0xEC003
    fill $0E,$00    // 0xFC002

    incbin code/mmc5gfx.bin

    fill $FFFF,$00  // 0x107010
    fill $FFFF,$00  // 0x11700F
    fill $FFFF,$00  // 0x12700E
    fill $FFFF,$00  // 0x13700D
    fill $FFFF,$00  // 0x14700C
    fill $FFFF,$00  // 0x15700B
    fill $FFFF,$00  // 0x16700A
    fill $FFFF,$00  // 0x177009
    fill $FFFF,$00  // 0x187008
    fill $FFFF,$00  // 0x197007
    fill $FFFF,$00  // 0x1A7006
    fill $FFFF,$00  // 0x1B7005
    fill $FFFF,$00  // 0x1C7004
    fill $FFFF,$00  // 0x1D7003
    fill $FFFF,$00  // 0x1E7002
    fill $900F,$00  // 0x1F7001