Merge pull request #34 from citee520/main

add mapper33

src/nes/mapper/mapper033.ts

@@ -0,0 +1,46 @@
+import {Mapper, MapperOptions} from './mapper'
+import {MirrorMode} from '../ppu/types'
+
+export class Mapper033 extends Mapper {
+	public static create(options: MapperOptions): Mapper {
+		return new Mapper033(options)
+	}
+
+	constructor(options: MapperOptions) {
+		super(options)
+
+		const BANK_BIT = 13  // 0x2000
+		const maxPrg = (options.cartridge!.prgRom.byteLength >> BANK_BIT) - 1
+		const kLast2Bank = maxPrg - 1
+
+		this.options.setPrgBank(0, 0)
+		this.options.setPrgBank(1, 1)
+		this.options.setPrgBank(2, kLast2Bank)
+		this.options.setPrgBank(3, kLast2Bank+1)
+
+
+		// Chr ROM bank
+		this.options.setWriteMemory(0x8000, 0xffff, (adr, value) => {
+			switch (adr & 0xa003) {
+				case 0x8000:
+					this.options.setPrgBank(0, value & 0x3f)
+					this.options.setMirrorMode((value & 0x40) === 0x40 ? MirrorMode.HORZ : MirrorMode.VERT)
+					break
+				case 0x8001:
+					this.options.setPrgBank(1, value & 0x3f)
+					break
+				case 0x8002:
+					this.options.setChrBankOffset(0, value*2)
+					this.options.setChrBankOffset(1, value*2+1)
+					break
+				case 0x8003:
+					this.options.setChrBankOffset(2, value*2)
+					this.options.setChrBankOffset(3, value*2+1)
+					break
+				case 0xa000: case 0xa001: case 0xa002: case 0xa003:
+					this.options.setChrBankOffset(4 + (adr & 0x03), value)
+					break
+			}
+		})
+	}
+}

src/nes/mapper/mapper_table.ts

@@ -12,6 +12,7 @@ import {Mapper019} from './mapper019'
 import {Mapper023, Mapper025} from './mapper023'
 import {Mapper024, Mapper026} from './mapper024'
 import {Mapper032} from './mapper032'
+import {Mapper033} from './mapper033'
 import {Mapper066} from './mapper066'
 import {Mapper069} from './mapper069'
 import {Mapper073} from './mapper073'
@@ -37,6 +38,7 @@ export const kMapperTable: Record<number, (options: MapperOptions) => Mapper> =
   26: Mapper026.create,
   30: Mapper030.create,
   32: Mapper032.create,
+  33: Mapper033.create,
   66: Mapper066.create,
   69: Mapper069.create,
   73: Mapper073.create,  // INES Mapper 073: Konami VRC3