copy over some changes from the project skeleton

1 files changed, 0 insertions, 219 deletions

diff --git a/snake.s b/snake.s
deleted file mode 100644
index 58665ba..0000000
--- a/snake.s
+++ /dev/null
@@ -1,219 +0,0 @@
-.MEMORYMAP
-DEFAULTSLOT  0
-SLOTSIZE     $4000
-SLOT 0       $C000
-SLOTSIZE     $2000
-SLOT 1       $0000 ; location doesn't matter, CHR data isn't in main memory
-.ENDME
-
-.ROMBANKMAP
-BANKSTOTAL  2
-BANKSIZE    $4000
-BANKS       1
-BANKSIZE    $2000
-BANKS       1
-.ENDRO
-
-
-  .enum $0000
-buttons_pressed DB
-head_x          DB
-head_y          DB
-direction       DB ; 0: up, 1: down, 2: left, 3: right
-frame_skip      DB
-frame_count     DB
-  .ende
-
-
-  .bank 0
-  .org $0000
-RESET:
-  SEI          ; disable IRQs
-  CLD          ; disable decimal mode
-  LDX #$40
-  STX $4017.W    ; disable APU frame IRQ
-  LDX #$FF
-  TXS          ; Set up stack
-  INX          ; now X = 0
-  STX $2000.W    ; disable NMI
-  STX $2001.W    ; disable rendering
-  STX $4010.W    ; disable DMC IRQs
-
-vblankwait1:       ; First wait for vblank to make sure PPU is ready
-  BIT $2002
-  BPL vblankwait1
-
-clrmem:
-  LDA #$00
-  STA $0000, x
-  STA $0100, x
-  STA $0300, x
-  STA $0400, x
-  STA $0500, x
-  STA $0600, x
-  STA $0700, x
-  LDA #$FE
-  STA $0200, x    ;move all sprites off screen
-  INX
-  BNE clrmem
-
-vblankwait2:      ; Second wait for vblank, PPU is ready after this
-  BIT $2002
-  BPL vblankwait2
-
-LoadPalettes:
-  LDA $2002    ; read PPU status to reset the high/low latch
-  LDA #$3F
-  STA $2006    ; write the high byte of $3F00 address
-  LDA #$00
-  STA $2006    ; write the low byte of $3F00 address
-  LDX #$00
-LoadPalettesLoop:
-  LDA palette.w, x        ;load palette byte
-  STA $2007             ;write to PPU
-  INX                   ;set index to next byte
-  CPX #$20            
-  BNE LoadPalettesLoop  ;if x = $20, 32 bytes copied, all done
-
-  ; initialize variables in ram
-  LDA #$00
-  STA buttons_pressed
-  STA direction
-  STA frame_count
-  LDA #$80
-  STA head_x
-  STA head_y
-  LDA #30
-  STA frame_skip
-
-  LDA #%00010000   ; enable sprites
-  STA $2001
-
-  LDA #%10000000   ; enable NMI interrupts
-  STA $2000
-
-loop:
-  JMP loop
-
-read_controller1:
-  ; latch
-  LDA #$01
-  STA $4016
-  LDA #$00
-  STA $4016
-
-  ; clock
-  LDX #$00
-read_controller1_values:
-  CPX #$08
-  BPL end_read_controller1
-
-  LDA $4016
-  AND #%00000001
-  ASL buttons_pressed
-  ORA buttons_pressed
-  STA buttons_pressed
-  INX
-  JMP read_controller1_values
-
-end_read_controller1:
-  RTS
-
-NMI:
-  JSR read_controller1
-
-handle_up:
-  LDA buttons_pressed
-  AND #%00001000
-  CMP #$00
-  BEQ handle_down
-  LDA #$00
-  STA direction
-
-handle_down:
-  LDA buttons_pressed
-  AND #%00000100
-  CMP #$00
-  BEQ handle_left
-  LDA #$01
-  STA direction
-
-handle_left:
-  LDA buttons_pressed
-  AND #%00000010
-  CMP #$00
-  BEQ handle_right
-  LDA #$02
-  STA direction
-
-handle_right:
-  LDA buttons_pressed
-  AND #%00000001
-  CMP #$00
-  BEQ handle_frame
-  LDA #$03
-  STA direction
-
-handle_frame:
-  LDX frame_count
-  INX
-  STX frame_count
-  CPX frame_skip
-  BMI draw_snake
-
-  LDA #$00
-  STA frame_count
-
-set_offset:
-  LDX #$F8             ; i.e., -8
-  LDA direction
-  AND #%00000001       ; low bit determines negative or positive
-  BEQ set_axis
-  LDX #$08
-
-set_axis:
-  LDY #$01
-  LDA direction
-  AND #%00000010       ; high bit determines which axis to change
-  BEQ apply_direction
-  LDY #$00
-
-apply_direction:
-  TXA
-  CLC
-  ADC head_x, y        ; head_x offset by 1 is head_y
-  STA head_x, y
-
-draw_snake:
-  LDA head_y
-  STA $0200
-  LDA #$00
-  STA $0201
-  LDA #$00
-  STA $0202
-  LDA head_x
-  STA $0203
-
-  LDA #$00
-  STA $2003
-  LDA #$02
-  STA $4014
-
-nmi_return:
-  RTI
-
-palette:
-  .db $0F,$31,$32,$33,$0F,$35,$36,$37,$0F,$39,$3A,$3B,$0F,$3D,$3E,$0F
-  .db $0F,$1C,$15,$14,$0F,$02,$38,$3C,$0F,$1C,$15,$14,$0F,$02,$38,$3C
-
-  .orga $FFFA    ;first of the three vectors starts here
-  .dw NMI        ;when an NMI happens (once per frame if enabled) the 
-                   ;processor will jump to the label NMI:
-  .dw RESET      ;when the processor first turns on or is reset, it will jump
-                   ;to the label RESET:
-  .dw 0          ;external interrupt IRQ is not used in this tutorial
-
-
-  .bank 1 slot 1
-  .org $0000
-  .incbin "snake.chr"