.pc =$0801 "Basic Upstart Program"
:BasicUpstart($0810)

//---------------------------------------------------------
//---------------------------------------------------------
//			2x2 Scroll
//---------------------------------------------------------
//---------------------------------------------------------
.var music = LoadSid("My_Glamrous_Life.sid")
.pc = $0810 "Main Program"
			ldx #0
!loop:
			.for(var i=0; i<4; i++) {
				lda #$20
				sta $0400+i*$100,x
				lda #$0f
				sta $d800+i*$100,x
			}
			inx
			bne !loop-

			lda #$00
			sta $d020
			sta $d021
			ldx #0
			ldy #0
			lda #music.startSong-1
			jsr music.init	
			sei
			lda #<irq1
			sta $0314
			lda #>irq1
			sta $0315
			asl $d019
			lda #$7b
			sta $dc0d
			lda #$81
			sta $d01a
			lda #$1b
			sta $d011
			lda #$80
			sta $d012
			cli
this:	jmp this
//---------------------------------------------------------
irq1:  	
			asl $d019
			inc $d020
			jsr music.play 
			inc $d020
			jsr scroll 
			
			lda #$c0
			ora scroll_xpos
			sta $d016
			lda #$1e
			sta $d018

			lda #0			
			sta $d020
			pla
			tay
			pla
			tax
			pla
			rti

//---------------------------------------------------------
.var scroll_screen = $0400

scroll:
	lda scroll_xpos
	sec
	sbc scroll_speed
	and #$07
	sta scroll_xpos
	bcc !moveChars+
	rts
!moveChars:
	// Move the chars
	ldx #0
!loop:

	lda scroll_screen+1,x
	sta scroll_screen,x
	lda scroll_screen+1+40,x
	sta scroll_screen+40,x
	inx
	cpx #40
	bne !loop-
	
	// print the new chars
!txtPtr: lda scroll_text
	cmp #$ff
	bne !noWrap+
	lda #<scroll_text
	sta !txtPtr-+1
	lda #>scroll_text
	sta !txtPtr-+2
	jmp !txtPtr-
!noWrap:
	ora scroll_charNo
	sta scroll_screen+39
	clc
	adc #$40	
	sta scroll_screen+39+40
	
	// Advance textpointer
	lda scroll_charNo
	eor #$80
	sta scroll_charNo
	bne !over+
!incr:
	inc !txtPtr-+1
	bne !over+
	inc !txtPtr-+2
!over:
		
	rts
scroll_xpos: .byte 0
scroll_speed: .byte 2
scroll_charNo: .byte 0


scroll_text:
	.text "hello world.. here is a scroll with a converted charset. the charset was "
	.text "drawn by trifox who asked how to convert it on csdb. this is a quick example of "
	.text "how it can be done in kick assembler... .. .. .   .  . "
	.byte $ff
//---------------------------------------------------------
.pc=music.location "Music"
.fill music.size, music.getData(i)
//---------------------------------------------------------
.pc = $3800
.var charsetPic = LoadPicture("2x2char.gif", List().add($000000, $ffffff))
.function picToCharset(byteNo, picture) {
	.var ypos = [byteNo&7] + 8*[[byteNo>>9]&1] 
	.var xpos = 2*[[byteNo>>3]&$3f] + [[byteNo>>10]&1]
	.return picture.getSinglecolorByte(xpos,ypos)		
}
.fill $800, picToCharset(i,charsetPic)