;set both data banks to VRAM
	ldim $E1, db
	ldimh $E0, db
	
	;setup palette
	ldim 2, r0
	outi $E, r0
	ldim 0, r0
	outi $E, r0
	ldimh $F, r0
	outi $E, r0
	
	;pointer to VRAM
	ldim 0, r0
	
	;black
	ldim 0, r1
	
	;4 pixels of red
	ldim $11, r2
	ldimh $11, r2
	
	;outer loop counter
	ldim 8, r4

	;framebuffer offset
	ldim 0, r5
outer:
	;loop counter to do one row of pattern
	ldim $A0, r3
	ldimh 0, r3
	
blackred:
	str16 r0, r5, r1
	addi 2, r5
	str16 r0, r5, r1
	addi 2, r5
	str16 r0, r5, r1
	addi 2, r5
	str16 r0, r5, r1
	addi 2, r5
	str16 r0, r5, r2
	addi 2, r5
	str16 r0, r5, r2
	addi 2, r5
	str16 r0, r5, r2
	addi 2, r5
	str16 r0, r5, r2
	addi 2, r5
	
	addi -1, r3
	bne blackred
	
	
	ldim $A0, r3
	ldimh 0, r3
redblack:
	str16 r0, r5, r2
	addi 2, r5
	str16 r0, r5, r2
	addi 2, r5
	str16 r0, r5, r2
	addi 2, r5
	str16 r0, r5, r2
	addi 2, r5
	str16 r0, r5, r1
	addi 2, r5
	str16 r0, r5, r1
	addi 2, r5
	str16 r0, r5, r1
	addi 2, r5
	str16 r0, r5, r1
	addi 2, r5
	
	addi -1, r3
	bne redblack
	
	addi -1, r4
	bne outer
	
	ldim 1, r4
	ldimh $80, r4
	outi $D, r4
	
forever:
	bra forever