SPO600 Lab3 - decide what to write

 Hamburger application

In this Lab, we are allowed to decide what program to write  as long as the program meet the below criteria:-

1. The program have to work in the 6520 Emulator
2. Output to the character screen and the graphic screen
3. get input from the keyboard
4. use some math instruction, e.g. add/ subtract

On this long night of assignments, I was so hungry that I decided to create a Hamburger application to design my own burger!

Remark: This program is original.

Specification:
1. The user will be able to choose the filling of the hamburger, e.g. egg, meat and vegetables, by pressing number key on keyboard.
2. Instruction of the program, filling options and respective cost will be printed on the character screen. 
3. The graphic screen will show the hamburger. When filling is choose by the user, the filling will be added to the graphic screen.
4. After four filling are added, the burger on the graphic display will be completed. 
5. Total cost will be calculated and displayed on the character display.


code:
 define SCINIT	$ff81 ; Initialize and clear the character display
 define CHROUT	$ffd2 ; print accumulator's value to screen
 define CCOUNT $0010
 define STPT_L $11
 define STPT_H $12 
 define COLOR $13
 define COST_L $14
 define COST_H $15

	jsr SCINIT

	ldy #$02
	sty COST_H
	ldy #$00
	sty COST_L
	lda #$04
	sta CCOUNT
	lda #$02
	sta STPT_H
	lda #$A0
	sta STPT_L

 menu:	lda instruc,y
	beq ini
	jsr CHROUT  
	iny
	bne menu

ini: 
	lda #$08  
	ldy #$00
layer1:
	sta $0266, y
	iny       
	cpy #$14
	bne layer1
	ldy #$00
 
layer2:
	sta $0284, y
	iny       
	cpy #$18
	bne layer2
	ldy #$00
 
;draw bread
	lda #$08
	sta COLOR
	jsr food

loop:
	jsr getkey
	cmp #$31
	beq lettuce
	cmp #$32
	bne getegg
	jmp meat
getegg:	jmp egg
add:	jsr food
	dec CCOUNT
	bne loop

;draw bread
	lda #$08
	sta COLOR
	jsr food

	lda #$08  
	ldy #$00
layer4:
	sta $0506, y
	iny       
	cpy #$14
	bne layer4
	ldy #$00

layer3:
	sta $04e4, y
	iny 
	cpy #$18
	bne layer3
	ldy #$00

;print cost
	ldy #$00
cost: lda price,y
	beq cashier
	jsr CHROUT  
	iny
	bne cost

cashier:
	lda COST_H
	clc
	adc #$30
	jsr CHROUT
 	ldy COST_L
	beq done; 00 cents
	lda #$2e
	jsr CHROUT
	cpy #$40 ; check if 25 cents
	bne check50
	lda #$32
	JSR CHROUT
	lda #$35
	jsr CHROUT
	jmp done
check50:	cpy #$80 ; check if 50 cents
	bne print75
	lda #$35
	JSR CHROUT
	jmp done
	print75:
	lda #$37
	JSR CHROUT
	lda #$35
	JSR CHROUT
	jmp done
;=========================================

done:  
	brk

lettuce:
	lda #$05
	sta COLOR
	lda COST_L
	SEC
	SBC #$40
	STA COST_L
	lda COST_H
	SBC #$00
	STA COST_H
	jmp add

meat:
	lda #$09
	sta COLOR
	lda #$80
	clc
	adc COST_L
	sta COST_L
	lda #$01
	adc COST_H
	sta COST_H
	jmp add

egg:
	lda #$01
	sta COLOR
	lda #$c0
	clc
	adc COST_L
	sta COST_L
	lda #$00
	adc COST_H
	sta COST_H
	jmp add

food: 
	ldx #$00
	lda COLOR
food_i: 
	ldy #$03
	lda COLOR
	jsr draw
	lda #$20
	clc
	adc STPT_L
	sta STPT_L
	bne next
	inc STPT_H
next: inx
	cpx #$03 ; draw 2 layer
	bne food_i
	rts


;a: color code, STPL_L: start position; y:offset
draw:  
	sta (STPT_L), y
	iny
	cpy #$1d
	bne draw
	rts

 getkey:  ;to get the input 1/2/3 to accumulator
	lda $ff
	beq getkey
	cmp #$31
	bmi getkey 
	cmp #$34
	bpl getkey
	ldx #$00
	stx $ff
	rts 


 instruc: 
 dcb "S","e","l","e","c","t",32,"4",32,"B","u","r","g","e"
 dcb "r",32,"f","i","l","l","i","n","g",32,"b","y",32
 dcb "p","r","e","s","s","i","n","g",32,"1",$2c,32,"2",32
 dcb "o","r",32,"3",$0d,"(","b","a","s","e",32,"c","o","s"
 dcb "t",":",32,"$","2",")",$0d
 dcb "O","p","t","i","o","n","s",":",$0d
 dcb "1",":","l","e","t","t"
 dcb "u","c","e",32,"-","$","0",".","2","5",$0d
 dcb "2",":","m","e","a","t",32,"$","1",".","5",$0d
 dcb "3",".","e","g","g",32,"$","0",".","7","5",$0d,00

price:
 dcb "y","o","u","r",32,"c","o","s","t",32,"i","s",":",32
 dcb "$",00
Example Output by typing 1,2,3,1:
Example Output by typing 3,2,1,2:




Reflection:

Designing a new program that utilizes the graphics screen, character screen, keyboard input, and mathematical operations, while keeping it simple enough to implement in assembly was not easy. I spent a significant amount of time refining the design.

In this lab, I applied what I recently learned in the SPO600 course. I used the character screen to display content, with the dcb keyword proving especially useful for storing messages and text. Meanwhile, the graphics screen enhances the user experience, though it presents challenges for the programmer. I had to rely on trial and error to complete the image pixel by pixel. Additionally, I practiced performing addition and subtraction on two-byte values, utilizing the carry flag. I particularly enjoyed making my application interactive by allowing the user to provide input.



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