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40 lines
1.0 KiB
Markdown
40 lines
1.0 KiB
Markdown
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[< back to index](../index.md)
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# NES/Famicom-oriented modules
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## `nes_hardware` module
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The `nes_hardware` module is imported automatically on NES targets.
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TODO
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## `nes_mmc4` module
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The `nes_mmc4` module is imported automatically on the NES MMC4 target.
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and contains routines related to MMC4 bankswitching.
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#### `void set_prg_bank(byte a)`
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Changes the $8000-$BFFF PRG bank.
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#### `void set_chr_bank0(byte a)`
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Changes the CHR bank 0 ($0000-$0fff in the PPU memory space).
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The high nibble (0 or 1) selects between `chrrom0` and `chrrom1` segments.
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The low nibble L (0-$F) selects a 4K-aligned address in the segment ($L000).
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#### `void set_chr_bank1(byte a)`
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Changes the CHR bank 1 ($1000-$1fff in the PPU memory space).
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The high nibble (0 or 1) selects between `chrrom0` and `chrrom1` segments.
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The low nibble L (0-$F) selects a 4K-aligned address in the segment ($L000).
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#### `void set_vertical_mirroring()`
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Switches nametable mirroring to vertical.
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#### `void set_horizontal_mirroring()`
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Switches nametable mirroring to horizontal.
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