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7689c6dd07
This change looks dramatic, but it's just separating out the already-split namespaces into separate top-level folders. In theory, every single one could be built into their own Nuget package. `SabreTools.Serialization` still builds the normal Nuget package that is used by all other projects and includes all namespaces.
99 lines
3.1 KiB
C#
99 lines
3.1 KiB
C#
namespace SabreTools.Data.Models.NES
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{
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/// <summary>
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/// Common NES header pieces
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/// </summary>
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/// <see href="https://www.nesdev.org/wiki/INES"/>
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/// <see href="https://www.nesdev.org/wiki/NES_2.0"/>
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public abstract class CartHeader
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{
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/// <summary>
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/// Constant $4E $45 $53 $1A (ASCII "NES" followed by MS-DOS end-of-file)
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/// </summary>
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public byte[] IdentificationString { get; set; } = new byte[4];
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/// <summary>
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/// Size of PRG ROM in 16 KB units
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/// </summary>
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public byte PrgRomSize { get; set; }
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/// <summary>
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/// Size of CHR ROM in 8 KB units
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/// </summary>
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/// <remarks>Value 0 means the board uses CHR RAM</remarks>
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public byte ChrRomSize { get; set; }
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#region Byte 6
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/// <summary>
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/// Nametable arrangement
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/// </summary>
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/// <remarks>Byte 6, Bit 0</remarks>
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public NametableArrangement NametableArrangement { get; set; }
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/// <summary>
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/// Cartridge contains battery-backed PRG RAM ($6000-7FFF)
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/// or other persistent memory
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/// </summary>
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/// <remarks>Byte 6, Bit 1</remarks>
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public bool BatteryBackedPrgRam { get; set; }
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/// <summary>
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/// 512-byte trainer at $7000-$71FF
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/// </summary>
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/// <remarks>Byte 6, Bit 2</remarks>
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public bool TrainerPresent { get; set; }
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/// <summary>
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/// Alternative nametable layout
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/// </summary>
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/// <remarks>Byte 6, Bit 3</remarks>
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public bool AlternativeNametableLayout { get; set; }
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/// <summary>
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/// Lower nibble of Mapper number
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/// </summary>
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/// <remarks>Byte 6, Bits 4-7</remarks>
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public byte MapperLowerNibble { get; set; }
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#endregion
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#region Byte 7
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/// <summary>
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/// Nametable arrangement
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/// </summary>
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/// <remarks>
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/// Byte 7, Bits 0-1
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///
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/// The PlayChoice-10 bit is not part of the official specification,
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/// and most emulators simply ignore the extra 8 KB of data. PlayChoice
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/// games are designed to look good with the 2C03 RGB PPU, which handles
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/// color emphasis differently from a standard NES PPU.
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///
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/// Vs. games have a coin slot and different palettes. The detection
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/// of which palette a particular game uses is left unspecified.
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/// </remarks>
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public ConsoleType ConsoleType { get; set; }
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/// <summary>
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/// Indicates NES 2.0 format
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/// </summary>
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/// <remarks>
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/// Byte 7, Bits 2-3 == 0x02
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///
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/// NES 2.0 is a more recent extension to the format that allows more
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/// flexibility in ROM and RAM size, among other things.
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/// </remarks>
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public bool NES20 { get; set; }
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/// <summary>
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/// Upper nibble of Mapper number
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/// </summary>
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/// <remarks>Byte 7, Bits 4-7</remarks>
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public byte MapperUpperNibble { get; set; }
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#endregion
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}
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}
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