mirror of
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66 lines
2.0 KiB
Plaintext
66 lines
2.0 KiB
Plaintext
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; Let's start a little library for naming parts of memory in the NES
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; We can move this to a separate library file later.
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;
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; Including this file will not emit any instructions or data into your binary
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; It only defines symbols in the symbol table to name memory addresses
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;
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; Author: Saf Allen 2015
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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.org $0000
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.scope nes
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.scope ppu
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.org $2000
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.space control1 1 ; Control registers 1 and 2
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.space control2 1
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.space status 1 ; PPU status
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.space sprite_address 1 ; Sprite memory address
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.space sprite_data 1 ; Sprite memory data
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.space scroll 1 ; Background scroll
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.space address 1 ; Indexing into PPU memory address
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.space data 1 ; Read or write to PPU memory location through this register
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.org $4014
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.space sprite_dma 1 ; DMA access to sprite memory
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.
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.org $4000
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.scope apu
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.scope square1 ; Control of Square 1
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.space reg1 1
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.space reg2 1
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.space reg3 1
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.space reg4 1
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.
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.scope square2 ; Control of Square 2
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.space reg1 1
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.space reg2 1
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.space reg3 1
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.space reg4 1
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.
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.scope triangle ; Control of Triangle
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.space reg1 1
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.space reg2 1
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.space reg3 1
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.space reg4 1
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.
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.scope noise ; Control of Noise
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.space reg1 1
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.space reg2 1
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.space reg3 1
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.space reg4 1
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.
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.scope dmc ; Control of DMC
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.space reg1 1
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.space reg2 1
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.space reg3 1
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.space reg4 1
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.
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.org $4015
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.space channel_enable 1 ; Enable or disble channels
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.
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.org $4016
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.space controller1 1 ; Player 1 joystick
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.space controller2 1 ; Player 2 joystick
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.
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