calculator.ch8

; Main program (starts at 0x200)
00E0                ; Clear the display first

; First number input
6000                ; Set V0 = 0 (initialize)
F00A                ; Wait for key press (stored in V0)
A000                ; Set I to digit sprite location
F029                ; Get location of sprite for V0
6100                ; Set V1 = 0 (x position)
6200                ; Set V2 = 0 (y position)
D125                ; Draw first number (height=5)

; Draw plus sign
7108                ; Increment x position by 8
A2FF                ; Point I to custom + sprite (stored right after program)
D125                ; Draw + sign

; Second number input
6300                ; Set V3 = 0 (initialize)
F30A                ; Wait for key press (stored in V3)
7108                ; Increment x position by 8
A000                ; Set I to digit sprite location
F329                ; Get location of sprite for V3
D125                ; Draw second number

; Draw equals sign
7108                ; Increment x position by 8
A304                ; Point I to custom = sprite (stored after + sprite)
D125                ; Draw = sign

; Calculate and display sum
8304                ; Add V0 and V3, store in V3
7108                ; Increment x position by 8
A000                ; Set I to digit sprite location
F329                ; Get location of sprite for sum
D125                ; Draw result

12FE                ; Infinite loop

; Custom sprites (stored immediately after program code)
00 20 70 20 00      ; + sign sprite (5 bytes)
00 F0 00 F0 00      ; = sign sprite (5 bytes)