REP #$20

    LDA $20

    SEC

    SBC #$0001

    STA $20

    

    LDA $1E

    SEC

    SBC #$0001

    STA $1E

    SEP #$20

WAVE:

                    

 	REP #$20			;\ Set processor 16 bit

	LDA #$0D02			;| $4330 = $210D

	STA $4330			;| $4331 = Mode 02

	LDA #$9E00			;| 

	STA $4332			;| Destination: $7F9E00

	LDY #$7F			;| (low and high byte)

	STY $4334			;| 

	SEP #$20			;/ Set processor 8 bit



	LDA #$08			;\ Enable HDMA

	TSB $0D9F			;/ on channel 3



;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;HDMA Main Code

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;



	LDX #$00			;\ Init of

	LDY #$00			;/ X and Y



	SEP #$20			;\ Set processor 8 bit

	LDA $13				;| Set speed of waves 13

	LSR A				;| Adding more LSR A

	LSR A				;| will make it slower

	STA $00				;/ Store in scratch RAM



	PHB					;\ Push data bank

	PHK					;| Push program bank

	PLB					;/ Pull data bank



Wave_Loop2:

	LDA #$06			;\ Set scanline height

	STA $7F9E00,x		;| for each wave

	TYA					;| Transfer Y to A

	ADC $00				;| Add in scratch RAM

	AND #$0F			;| and transfer #$0F bytes

	PHY					;| Push Y

	TAY					;/ Transfer A to Y



	LDA.w Wave_Table2,y	;\ Load in wave values

	LSR A				;| half of waves only

	CLC					;| Clear carry flag

	ADC $1462			;| Apply to layer 1

	STA $7F9E01,x		;| X position low byte

	LDA $1463			;| And add nothing to

	ADC #$00			;| layer 1 X position

	STA $7F9E02,x		;/ high byte



	PLY					;\ Pull Y

	CPY #$25			;| Compare with #$25 scanlines

	BPL End_Wave2		;| If bigger, end HDMA

	INX					;| Increase X

	INX					;| Increase X

	INX					;| Increase X

	INY					;| Increase Y

	BRA Wave_Loop2		;/ Do the loop



End_Wave2:

	PLB					;\ Pull data bank

	LDA #$00			;| End HMDA by writing

	STA $7F9E03,x		;| #$00 here

	RTS					;/ Return



;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;Table Settings

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;



Wave_Table2:

	db $00

	db $01

	db $02

	db $03

	db $04

	db $05

	db $06

	db $07

	db $07

	db $06

	db $05

	db $04

	db $03

	db $02

	db $01

	db $00   





BGWAVE:

   	REP #$20			;\ Set processor 16 bit

	LDA #$1002			;| $4340 = $2110

	STA $4340			;| $4341 = Mode 02

	LDA #$9F00			;| 

	STA $4342			;| Destination: $7F9F00

	LDY #$7F			;| (low and high byte)

	STY $4344			;| 

	SEP #$20			;/ Set processor 8 bit



	LDA #$10			;\ Enable HDMA

	TSB $0D9F			;/ on channel 4



;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;HDMA Main Code

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;



	LDX #$00			;\ Init of

	LDY #$00			;/ X and Y



	SEP #$20			;\ Set processor 8 bit

	LDA $13				;| Set speed of waves 13

	LSR A				;| Adding more LSR A

	LSR A				;| will make it slower

	STA $00				;/ Store in scratch RAM



	PHB					;\ Push data bank

	PHK					;| Push program bank

	PLB					;/ Pull data bank



Wave_Loop:

	LDA #$06			;\ Set scanline height

	STA $7F9F00,x		;| for each wave

	TYA					;| Transfer Y to A

	ADC $00				;| Add in scratch RAM

	AND #$0F			;| and transfer #$0F bytes

	PHY					;| Push Y

	TAY					;/ Transfer A to Y



	LDA.w Wave_Table,y	;\ Load in wave values

	LSR A				;| half of waves only

	CLC					;| Clear carry flag

	ADC $1468			;| Apply to layer 2

	STA $7F9F01,x		;| Y position low byte

	LDA $1469			;| And add nothing to

	ADC #$00			;| layer 2 Y position

	STA $7F9F02,x		;/ high byte



	PLY					;\ Pull Y

	CPY #$25			;| Compare with #$25 scanlines

	BPL End_Wave		;| If bigger, end HDMA

	INX					;| Increase X

	INX					;| Increase X

	INX					;| Increase X

	INY					;| Increase Y

	BRA Wave_Loop		;/ Do the loop



End_Wave:

	PLB					;\ Pull data bank

	LDA #$00			;| End HMDA by writing

	STA $7F9F03,x		;| #$00 here

	RTS					;/ Return



;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;Table Settings

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;



Wave_Table:

	db $00

	db $01

	db $02

	db $03

	db $04

	db $05

	db $06

	db $07

	db $07

	db $06

	db $05

	db $04

	db $03

	db $02

	db $01

	db $00