game.asm

.org $c000 $fff9

.define BG_COLOR $5100
.define GREEN 2
.define BLUE 3
.define INPUT $5106
.define COLUMN $5103
.define ROW $5104
.define VRAM $5105

main:
LDA #1
STA BG_COLOR

.macro set_vram pos_x pos_y color
LDA #pos_x
STA COLUMN
LDA #pos_y
STA ROW
LDA #color
STA VRAM
.endmacro

.macro sprite address tile pos_x pos_y scale
; sprite 0
LDA #tile
STA address
LDA #pos_x
STA address+
LDA #pos_x
STA address++
LDA #scale
ASL A
ASL A
ASL A
ASL A
ORA #%00001001
STA address+++
.endmacro

;set_vram 0 0 6
;set_vram 1 0 6
;set_vram 2 0 6
;set_vram 3 0 7
;set_vram 4 0 7
;set_vram 5 0 6
;set_vram 6 0 6
;set_vram 7 0 6

LDA #%00001001 ; 
STA $5107 ; background mode

LDA #88 ; tnt
STA $4001

; sprite 0
LDA #9
STA $5000
LDA #100
STA $5001
LDA #100
STA $5002
LDA #%00111001
STA $5003

; sprite 1
LDA #1
STA $5004
LDA #100
STA $5005
LDA #100
STA $5006
LDA #%00111001
STA $5007

sprite $5008 80 200 200 3

loop:
JMP loop

ignore:
RTI

vsync:
INC player_x
LDA player_x
STA $5001
INC player_y
LDA player_y
STA $5002

DEC player2_x
LDA player2_x
STA $5005
DEC player2_y
LDA player2_y
STA $5006
RTI

.org $fffa
.dw vsync
.dw main
.dw ignore

.org $0000
player_x: .ram 1
player_y: .ram 1
player2_x: .ram 1
player2_y: .ram 1