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* C64, NES, and Atari 2600 ("Stella") useful constants headers.
* crt0.s equivalent for C64.
* Hello World for the C64.
16 lines
683 B
Plaintext
16 lines
683 B
Plaintext
; NES-related headers. Unlike the C64 and Stella developers, there is
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; no standard nomenclature for these registers. It's not uncommon to
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; see them hardcoded.
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; PPU registers have reasonably standard names, at least.
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.alias PPUCTRL $2000 ; PPU Control Register #1
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.alias PPUMASK $2001 ; PPU Control Register #2
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.alias PPUSTATUS $2002 ; PPU Status Register
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.alias OAMADDR $2003 ; SPR-RAM Address Register
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.alias OAMDATA $2004 ; SPR-RAM I/O Register
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.alias PPUSCROLL $2005 ; VRAM Address Register #1 (Panning control)
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.alias PPUADDR $2006 ; VRAM Address Register #2 (Direct Address control)
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.alias PPUDATA $2007 ; VRAM I/O Register
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.alias OAMDMA $4014 ; Sprite DMA Register
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