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7
README.md
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# Spaceship NES
This a project to learn how in the past they made games, spoiler alert it was in assembly, so I'm trying to learn how to make a basic arcade game with the help of book.famicon.party and learning how, in the process, learn some assembly and how the NES works.
This a test to learn how in the past they made games, spoiler alert it was in assembly, so I'm trying to learn how to make a basic arcade game with the help of book.famicon.party and learning how, in the process, learn some assembly and how the NES works.
![imagen](https://github.com/LinkHpp/Spaceship_NES/assets/63952783/578254fe-2f7d-4bc3-bf45-fb5a79a9d5c3)
![Spaceship_Image](https://github.com/LinkHpp/Spaceship_NES/assets/63952783/2f1ead34-9c9c-464c-be67-1257c0ae228d)
<img src="[Spaceship_Image](https://github.com/LinkHpp/Spaceship_NES/assets/63952783/2f1ead34-9c9c-464c-be67-1257c0ae228d)" width="100" height="100">
## How to compile .nes
If you want to use my code and change things to compile the .nes just use the assemble.sh file to create it!
NOTE: It only works on Linux if you are using Windows you'll have to do it manual

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assemble.sh Executable file → Normal file
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#! /bin/sh
ca65 src/spaceship.asm
ca65 src/helloworld.asm
ca65 src/reset.asm
ca65 src/controllers.asm
ld65 src/reset.o src/controllers.o src/spaceship.o -C nes.cfg -o spaceship.nes
ld65 src/reset.o src/helloworld.o -C nes.cfg -o helloworld.nes

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src/background.nam
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src/constants.inc
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PPUCTRL = $2000
PPUMASK = $2001
PPUSTATUS = $2002
PPUSCROLL = $2005
PPUADDR = $2006
PPUDATA = $2007
OAMADDR = $2003
OAMDMA = $4014
CONTROLLER1 = $4016
BTN_RIGHT = %00000001
BTN_LEFT = %00000010
BTN_DOWN = %00000100
BTN_UP = %00001000
BTN_START = %00010000
BTN_SELECT =%00100000
BTN_B = %01000000
BTN_A = %10000000
OAMDMA = $4014

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src/controllers.asm
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.include "constants.inc"
.segment "ZEROPAGE"
.importzp pad1
.segment "CODE"
.export read_controller
.proc read_controller
PHA
TXA
PHA
PHP
LDA #$01
STA CONTROLLER1
LDA #$00
STA CONTROLLER1
LDA #%00000001
STA pad1
get_buttons:
LDA CONTROLLER1
LSR A
ROL pad1
BCC get_buttons
PLP
PLA
TAX
PLA
RTS
.endproc

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src/header.inc
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.byte $4e, $45, $53, $1a ; Magic string that always begins an iNES header
.byte $02 ; Number of 16KB PRG-ROM banks
.byte $01 ; Number of 8KB CHR-ROM banks
.byte %00000000 ; Vertical mirroring, no save RAM, no mapper
.byte %00000001 ; Vertical mirroring, no save RAM, no mapper
.byte %00000000 ; No special-case flags set, no mapper
.byte $00 ; No PRG-RAM present
.byte $00 ; NTSC format

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src/helloworld.asm Normal file
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.include "constants.inc"
.include "header.inc"
.segment "CODE"
.proc irq_handler
RTI
.endproc
.proc nmi_handler
LDA #$00
STA OAMADDR
LDA #$02
STA OAMDMA
;Update tiles *after* DMA transfer
JSR update_player
JSR draw_player
LDA #$00
STA $2005
STA $2005
RTI
.endproc
.import reset_handler
.proc draw_player
;save registers
PHP
PHA
TXA
PHA
TYA
PHA
;write player ship tile numbers
LDA #$05
STA $0201
LDA #$06
STA $0205
LDA #$07
STA $0209
LDA #$08
STA $020D
; write player ship tile attributes
; use palette 0
LDA #$00
STA $0202
STA $0206
STA $020A
STA $020E
; store tile locations
; top left tile:
LDA player_y
STA $0200
LDA player_x
STA $0203
;top right tile (x+8):
LDA player_y
STA $0204
LDA player_x
CLC
ADC #$08
STA $0207
;bottom left tile (y+8)
LDA player_y
CLC
ADC #$08
STA $0208
LDA player_x
STA $020B
;bottom right tile (x+8, y+8)
LDA player_y
CLC
ADC #$08
STA $020C
LDA player_x
CLC
ADC #$08
STA $020F
; restore registers and return
PLA
TAY
PLA
TAX
PLA
PLP
RTS
.endproc
.proc update_player
PHP
PHA
TXA
PHA
TYA
PHA
LDA player_x
CMP #$e0
BCC not_at_right_edge
; if BCC is not taken, we are greater than $e0
LDA #$00
STA player_dir ; start moving left
JMP direction_set ; we already chose a direction,
; so we can skip the left side check
not_at_right_edge:
LDA player_x
CMP #$10
BCS direction_set
; if BCS not taken, we are less than $10
LDA #$01
STA player_dir ; start moving right
direction_set:
; now, actually update player_x
LDA player_dir
CMP #$01
BEQ move_right
; if player_dir minus $01 is not zero,
; that means player_dir was $00 and
; we need to move left
DEC player_x
JMP exit_subroutine
move_right:
INC player_x
exit_subroutine:
; all done, clean up an return
PLA
TAY
PLA
TAX
PLA
PLP
RTS
.endproc
.export main
.proc main
LDX PPUSTATUS
LDX #$3f
STX PPUADDR
LDX #$00
STX PPUADDR
LDX #$00
load_palettes:
LDA palettes,X
STA PPUDATA
INX
CPX #$20
BNE load_palettes
LDX #$00
; write a nametable
; Big Stars
LDA PPUSTATUS
LDA #$21
STA PPUADDR
LDA #$72
STA PPUADDR
LDX #$2F
STX PPUDATA
LDA PPUSTATUS
LDA #$20
STA PPUADDR
LDA #$68
STA PPUADDR
LDX #$2F
STX PPUDATA
LDA PPUSTATUS
LDA #$20
STA PPUADDR
LDA #$74
STA PPUADDR
LDX #$2F
STX PPUDATA
LDA PPUSTATUS
LDA #$21
STA PPUADDR
LDA #$5A
STA PPUADDR
LDX #$2F
STX PPUDATA
LDA PPUSTATUS
LDA #$21
STA PPUADDR
LDA #$CB
STA PPUADDR
LDX #$2F
STX PPUDATA
LDA PPUSTATUS
LDA #$21
STA PPUADDR
LDA #$64
STA PPUADDR
LDX #$2F
STX PPUDATA
LDA PPUSTATUS
LDA #$22
STA PPUADDR
LDA #$C7
STA PPUADDR
LDX #$2F
STX PPUDATA
LDA PPUSTATUS
LDA #$22
STA PPUADDR
LDA #$55
STA PPUADDR
LDX #$2F
STX PPUDATA
LDA PPUSTATUS
LDA #$22
STA PPUADDR
LDA #$B9
STA PPUADDR
LDX #$2F
STX PPUDATA
LDA PPUSTATUS
LDA #$23
STA PPUADDR
LDA #$6D
STA PPUADDR
LDX #$2F
STX PPUDATA
; write a nametable
; Medium Stars
LDA PPUSTATUS
LDA #$20
STA PPUADDR
LDA #$64
STA PPUADDR
LDX #$2D
STX PPUDATA
LDA PPUSTATUS
LDA #$20
STA PPUADDR
LDA #$4F
STA PPUADDR
LDX #$2D
STX PPUDATA
LDA PPUSTATUS
LDA #$20
STA PPUADDR
LDA #$B9
STA PPUADDR
LDX #$2D
STX PPUDATA
LDA PPUSTATUS
LDA #$20
STA PPUADDR
LDA #$DD
STA PPUADDR
LDX #$2D
STX PPUDATA
LDA PPUSTATUS
LDA #$21
STA PPUADDR
LDA #$4D
STA PPUADDR
LDX #$2D
STX PPUDATA
LDA PPUSTATUS
LDA #$20
STA PPUADDR
LDA #$D1
STA PPUADDR
LDX #$2D
STX PPUDATA
; write a nametable
; Small Stars
LDA PPUSTATUS
LDA #$20
STA PPUADDR
LDA #$3A
STA PPUADDR
LDX #$2E
STX PPUDATA
LDA PPUSTATUS
LDA #$20
STA PPUADDR
LDA #$B9
STA PPUADDR
LDX #$2E
STX PPUDATA
LDA PPUSTATUS
LDA #$21
STA PPUADDR
LDA #$4D
STA PPUADDR
LDX #$2E
STX PPUDATA
LDA PPUSTATUS
LDA #$21
STA PPUADDR
LDA #$4D
STA PPUADDR
LDX #$2E
STX PPUDATA
LDA PPUSTATUS
LDA #$21
STA PPUADDR
LDA #$F0
STA PPUADDR
LDX #$2E
STX PPUDATA
LDA PPUSTATUS
LDA #$22
STA PPUADDR
LDA #$26
STA PPUADDR
LDX #$2E
STX PPUDATA
LDA PPUSTATUS
LDA #$22
STA PPUADDR
LDA #$E4
STA PPUADDR
LDX #$2E
STX PPUDATA
LDA PPUSTATUS
LDA #$22
STA PPUADDR
LDA #$CE
STA PPUADDR
LDX #$2E
STX PPUDATA
LDA PPUSTATUS
LDA #$23
STA PPUADDR
LDA #$36
STA PPUADDR
LDX #$2E
STX PPUDATA
; finally, attribute table
LDA PPUSTATUS
LDA #$23
STA PPUADDR
LDA #$D4
STA PPUADDR
LDA #%01110000
STA PPUDATA
vblankwait: ; wait for another vblank before continuing
BIT PPUSTATUS
BPL vblankwait
LDA #%10010000 ; turn on NMIs, sprites use first pattern table
STA PPUCTRL
LDA #%00011110 ; turn on screen
STA PPUMASK
forever:
JMP forever
.endproc
.segment "ZEROPAGE"
player_x: .res 1
player_y: .res 1
player_dir: .res 1
.exportzp player_x, player_y
.segment "RODATA"
palettes:
.byte $0f, $12, $23, $27
.byte $0f, $2b, $3c, $39
.byte $0f, $0c, $07, $13
.byte $0f, $19, $09, $29
.byte $0f, $2d, $10, $15
.byte $0f, $19, $09, $29
.byte $0f, $19, $09, $29
.byte $0f, $19, $09, $29
sprite:
.byte $70, $05, $00, $80
.byte $70, $06, $00, $88
.byte $78, $07, $00, $80
.byte $78, $08, $00, $88
.segment "VECTORS"
.addr nmi_handler, reset_handler, irq_handler
.segment "CHR"
.incbin "starfield.chr"

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src/reset.o
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src/spaceship.asm
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.include "constants.inc"
.include "header.inc"
.segment "CODE"
.proc irq_handler
RTI
.endproc
.import read_controller
.proc nmi_handler
LDA #$00
STA OAMADDR
LDA #$02
STA OAMDMA
;Update tiles *after* DMA transfer
JSR update_player
JSR draw_player
JSR read_controller
LDA scroll
CMP #$00
BNE set_scroll_positions
LDA ppucrtl_settings
EOR #%00000010
STA ppucrtl_settings
STA PPUCTRL
LDA #240
STA scroll
set_scroll_positions:
LDA #$00
STA PPUSCROLL
DEC scroll
LDA scroll
STA PPUSCROLL
RTI
.endproc
.import reset_handler
.proc draw_player
;save registers
PHP
PHA
TXA
PHA
TYA
PHA
;write player ship tile numbers
LDA #$05
STA $0201
LDA #$06
STA $0205
LDA #$07
STA $0209
LDA #$08
STA $020D
; write player ship tile attributes
; use palette 0
LDA #$03
STA $0202
STA $0206
STA $020A
STA $020E
; store tile locations
; top left tile:
LDA player_y
STA $0200
LDA player_x
STA $0203
;top right tile (x+8):
LDA player_y
STA $0204
LDA player_x
CLC
ADC #$08
STA $0207
;bottom left tile (y+8)
LDA player_y
CLC
ADC #$08
STA $0208
LDA player_x
STA $020B
;bottom right tile (x+8, y+8)
LDA player_y
CLC
ADC #$08
STA $020C
LDA player_x
CLC
ADC #$08
STA $020F
; restore registers and return
PLA
TAY
PLA
TAX
PLA
PLP
RTS
.endproc
.proc update_player
PHP
PHA
TXA
PHA
TYA
PHA
LDA pad1
AND #BTN_LEFT
BEQ check_right
DEC player_x
DEC player_x
check_right:
LDA pad1
AND #BTN_RIGHT
BEQ check_up
INC player_x
INC player_x
check_up:
LDA pad1
AND #BTN_UP
BEQ check_down
DEC player_y
DEC player_y
check_down:
LDA pad1
AND #BTN_DOWN
BEQ done_checking
INC player_y
INC player_y
done_checking:
PLA
TAY
PLA
TAX
PLA
PLP
RTS
.endproc
.export main
.proc main
LDA #239
STA scroll
LDX PPUSTATUS
LDX #$3f
STX PPUADDR
LDX #$00
STX PPUADDR
LDX #$00
load_palettes:
LDA palettes,X
STA PPUDATA
INX
CPX #$20
BNE load_palettes
load_background:
LDX PPUSTATUS
LDX #$20
STX PPUADDR
LDX #$00
STX PPUADDR
LDA #<background
STA pointerLo
LDA #>background
STA pointerHi
LDX #$00
LDY #$00
outsideloop:
insideloop:
LDA (pointerLo), y
STA PPUDATA
INY
BNE insideloop
INC pointerHi
INX
CPX #$04
BNE outsideloop
load_background2:
LDX PPUSTATUS
LDX #$28
STX PPUADDR
LDX #$00
STX PPUADDR
LDA #<background2
STA pointerLo
LDA #>background2
STA pointerHi
LDX #$00
LDY #$00
outsideloop2:
insideloop2:
LDA (pointerLo), y
STA PPUDATA
INY
BNE insideloop2
INC pointerHi
INX
CPX #$04
BNE outsideloop2
LDA #%10010000
STA ppucrtl_settings
STA PPUCTRL
vblankwait: ; wait for another vblank before continuing
BIT PPUSTATUS
BPL vblankwait
LDA #%10010000 ; turn on NMIs, sprites use first pattern table
STA PPUCTRL
LDA #%00011110 ; turn on screen
STA PPUMASK
forever:
JMP forever
.endproc
.segment "ZEROPAGE"
player_x: .res 1
player_y: .res 1
pointerLo: .res 1
pointerHi: .res 1
scroll: .res 1
ppucrtl_settings: .res 1
pad1: .res 1
.exportzp player_x, player_y
.exportzp pad1
.segment "RODATA"
palettes: .incbin "background.pal"
sprite:
.byte $70, $05, $00, $80
.byte $70, $06, $00, $88
.byte $78, $07, $00, $80
.byte $78, $08, $00, $88
background: .incbin "background.nam"
background2: .incbin "background2.nam"
.segment "VECTORS"
.addr nmi_handler, reset_handler, irq_handler
.segment "CHR"
.incbin "starfield.chr"

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