;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;  Let's start a little library for naming parts of memory in the NES
;  We can move this to a separate library file later.
;  
;  Including this file will not emit any instructions or data into your binary
;  It only defines symbols in the symbol table to name memory addresses
;
;  Author: Saf Allen 2015
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

.org $0000
.scope nes
  .scope ppu
    .org $2000
    .space control1 1             ;  Control registers 1 and 2
    .space control2 1
    .space status 1               ;  PPU status
    .space sprite_address 1     ;  Sprite memory address
    .space sprite_data 1        ;  Sprite memory data
    .space scroll 1             ;  Background scroll
    .space address 1              ;  Indexing into PPU memory address
    .space data 1                 ;  Read or write to PPU memory location through this register
    .org $4014
    .space sprite_dma 1           ;  DMA access to sprite memory
  .

  .org $4000
  .scope apu
    .scope square1                ;  Control of Square 1
      .space reg1 1
      .space reg2 1
      .space reg3 1
      .space reg4 1
    .
    .scope square2                ;  Control of Square 2
      .space reg1 1
      .space reg2 1
      .space reg3 1
      .space reg4 1
    .
    .scope triangle                ;  Control of Triangle
      .space reg1 1
      .space reg2 1
      .space reg3 1
      .space reg4 1
    .
    .scope noise                ;  Control of Noise
      .space reg1 1
      .space reg2 1
      .space reg3 1
      .space reg4 1
    .
    .scope dmc                  ;  Control of DMC
      .space reg1 1
      .space reg2 1
      .space reg3 1
      .space reg4 1
    .
    .org $4015
    .space channel_enable 1      ;  Enable or disble channels
  .
  .org $4016
  .space controller1 1           ;  Player 1 joystick
  .space controller2 1           ;  Player 2 joystick
.