SPO600 Lab1 (Pt.2) - Modifying the code

 In this part, I have to revise the code to fulfill the task.

task 1: Change the code to fill the display with light blue instead of yellow.

Solution:

        lda #$00	; set a pointer in memory location $40 to point to $0200
 	sta $40		; ... low byte ($00) goes in address $40
 	lda #$02	
 	sta $41		; ... high byte ($02) goes into address $41
 	lda #$e	        ; colour number
 	ldy #$00	; set index to 0
 loop:	sta ($40),y	; set pixel colour at the address (pointer)+Y
 	iny		; increment index
 	bne loop	; continue until done the page (256 pixels)
 	inc $41		; increment the page
 	ldx $41		; get the current page number
 	cpx #$06	; compare with 6
 	bne loop	; continue until done all pages

task 2. Change the code to fill the display with a different colour on each page

The idea of my solution is to store the selected color code in four consecutive memory. Then, use a pointer to reach those color code. Of course, another way to do this is to load the color code to the Accumulate manually and jump to the loop for 4 times. But, I like to set the color at the beginner more since I feel like the program is more readable this way.

Solution:

        
        lda #$00        ; set a pointer in memory location $40 to point to $0200
 	sta $40        ; ... low byte ($00) goes in address $40
 	lda #$02	
 	sta $41        ; ... high byte ($02) goes into address $41
 	lda #$e        ;light blue color
	sta $42        ; #$e goes into address $42
 	lda #$2        ;red color
	sta $43        ; #$2 goes into address $43
 	lda #$5        ;Green color
	sta $44        ; #$5 goes into address $44
 	lda #$7        ;Yellow color
	sta $45        ; #$7 goes into address $45
	lda #$42       ; set a pointer of the color code in memory location $46 to $47
	sta $46;
	lda #$00;
	sta $47;
	ldy #$00	; set index to 0

 Colorloop: lda ($46),y	; get colour code thru the pointer, y is zero
 
 loop:	sta ($40),y	; set pixel colour at the address (pointer)+Y
 	iny		; increment index
 	bne loop	; continue until done the page (256 pixels)
 	inc $46         ; increment the color pointer
	inc $41		; increment the page
 	ldx $41		; get the current page number
 	cpx #$06	; compare with 6
 	bne Colorloop	; continue until done all pages


task 3. Make each pixel a random colour.

We can get a random bit with the one-byte pseudo-random number generator (PRNG) at $fe and assign it to a pixel. Repeat it till the entire bitmapped display is filled.

Solution:

        lda #$00	; set a pointer in memory location $40 to point to $0200
 	sta $40		; ... low byte ($00) goes in address $40
 	lda #$02	
 	sta $41		; ... high byte ($02) goes into address $41

 	ldy #$00	; set index to 0
 loop:  lda $fe	        ; get from colour number PRNG
	sta ($40),y	; set pixel colour at the address (pointer)+Y
 	iny		; increment index
 	bne loop	; continue until done the page (256 pixels)
 	inc $41		; increment the page
 	ldx $41		; get the current page number
 	cpx #$06	; compare with 6
 	bne loop	; continue until done all pages

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