implement MMC1.

miochen1226 · Oct 9, 2023 · 6f7ca42 · 6f7ca42
1 parent 7185bc5
commit 6f7ca42
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Showing 6 changed files with 312 additions and 5 deletions.
diff --git a/...U.xcodeproj/project.xcworkspace/xcuserdata/mio.xcuserdatad/UserInterfaceState.xcuserstate b/...U.xcodeproj/project.xcworkspace/xcuserdata/mio.xcuserdatad/UserInterfaceState.xcuserstate
diff --git a/NES_EMU.xcodeproj/xcuserdata/mio.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist b/NES_EMU.xcodeproj/xcuserdata/mio.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist
@@ -7,16 +7,90 @@
       <BreakpointProxy
          BreakpointExtensionID = "Xcode.Breakpoint.FileBreakpoint">
          <BreakpointContent
-            uuid = "950CC3D5-8506-4D9E-9016-6C7AD3469A23"
+            uuid = "B498D3E7-53C4-4221-8E2B-3BBCD0B8AD8C"
+            shouldBeEnabled = "No"
+            ignoreCount = "0"
+            continueAfterRunningActions = "No"
+            filePath = "Shared/NES/PPU/Ppu.swift"
+            startingColumnNumber = "9223372036854775807"
+            endingColumnNumber = "9223372036854775807"
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+            endingLineNumber = "1229">
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+         BreakpointExtensionID = "Xcode.Breakpoint.FileBreakpoint">
+         <BreakpointContent
+            uuid = "A1E72C46-D98A-4186-BAAC-C49BF04A2DEC"
+            shouldBeEnabled = "Yes"
+            ignoreCount = "0"
+            continueAfterRunningActions = "No"
+            filePath = "Shared/UI/GameScene.swift"
+            startingColumnNumber = "9223372036854775807"
+            endingColumnNumber = "9223372036854775807"
+            startingLineNumber = "187"
+            endingLineNumber = "187">
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+         BreakpointExtensionID = "Xcode.Breakpoint.FileBreakpoint">
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+            uuid = "BCE641D7-7956-4DF7-8BF6-E2B63D404DE3"
             shouldBeEnabled = "Yes"
             ignoreCount = "0"
             continueAfterRunningActions = "No"
             filePath = "Shared/NES/PPU/Ppu.swift"
             startingColumnNumber = "9223372036854775807"
             endingColumnNumber = "9223372036854775807"
-            startingLineNumber = "164"
-            endingLineNumber = "164"
-            landmarkName = "handleCpuWrite(_:value:)"
+            startingLineNumber = "1258"
+            endingLineNumber = "1258">
+         </BreakpointContent>
+      </BreakpointProxy>
+      <BreakpointProxy
+         BreakpointExtensionID = "Xcode.Breakpoint.FileBreakpoint">
+         <BreakpointContent
+            uuid = "0720870A-9115-43F0-B2A2-935A23656D43"
+            shouldBeEnabled = "Yes"
+            ignoreCount = "0"
+            continueAfterRunningActions = "No"
+            filePath = "Shared/NES/Cartridge/Mapper/Mapper.swift"
+            startingColumnNumber = "9223372036854775807"
+            endingColumnNumber = "9223372036854775807"
+            startingLineNumber = "31"
+            endingLineNumber = "31"
+            landmarkName = "CanWriteSavMemory()"
+            landmarkType = "7">
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+         BreakpointExtensionID = "Xcode.Breakpoint.FileBreakpoint">
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+            shouldBeEnabled = "Yes"
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+            filePath = "Shared/NES/Cartridge/Cartridge.swift"
+            startingColumnNumber = "9223372036854775807"
+            endingColumnNumber = "9223372036854775807"
+            startingLineNumber = "30"
+            endingLineNumber = "30"
+            landmarkName = "handlePpuWrite(_:value:)"
+            landmarkType = "7">
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+            filePath = "Shared/NES/Cartridge/Cartridge.swift"
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             landmarkType = "7">
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diff --git a/Roms.bundle/Chou-Wakusei Senki - MetaFight (J).nes b/Roms.bundle/Chou-Wakusei Senki - MetaFight (J).nes
diff --git a/Shared/NES/Cartridge/Cartridge.swift b/Shared/NES/Cartridge/Cartridge.swift
@@ -119,7 +119,15 @@ class Cartridge: ICartridge {
         //let filepath = bundleUrl!.appendingPathComponent("Super Mario Bros. (Japan, USA).nes")
         //let filepath = bundleUrl!.appendingPathComponent("Donkey Kong (Japan).nes")
         //let filepath = bundleUrl!.appendingPathComponent("Ice Climber (Japan).nes")
-        let filepath = bundleUrl!.appendingPathComponent("Super Mario Bros. 3 (USA).nes")
+        //let filepath = bundleUrl!.appendingPathComponent("Super Mario Bros. 3 (USA).nes")
+        //Takahashi Meijin no Bouken-jima (Japan).nes
+        //let filepath = bundleUrl!.appendingPathComponent("Blaster Master (USA).nes")
+
+
+        let filepath = bundleUrl!.appendingPathComponent("Chou-Wakusei Senki - MetaFight (J).nes")
+        //let filepath = bundleUrl!.appendingPathComponent("Super Mario Bros. 3 (USA).nes")
+        //Chou-Wakusei Senki - MetaFight (J)
+
         //if let filepath = Bundle.main.path(forResource: "Donkey Kong (Japan)", ofType: "nes")
         //if let filepath = Bundle.main.path(forResource: "Circus Charlie (J) [p1]", ofType: "nes")
         //if let filepath = Bundle.main.path(forResource: "Ice Climber (Japan)", ofType: "nes")
@@ -188,6 +196,10 @@ class Cartridge: ICartridge {
                 mapper = Mapper0()
                 mapper.Initialize(numPrgBanks: UInt8(numPrgBanks), numChrBanks: UInt8(numChrBanks), numSavBanks: UInt8(numSavBanks))
             }
+            else if mN == 1 {
+                mapper = Mapper1()
+                mapper.Initialize(numPrgBanks: UInt8(numPrgBanks), numChrBanks: UInt8(numChrBanks), numSavBanks: UInt8(numSavBanks))
+            }
             else if mN == 4 {
                 mapper = Mapper4()
                 mapper.Initialize(numPrgBanks: UInt8(numPrgBanks), numChrBanks: UInt8(numChrBanks), numSavBanks: UInt8(numSavBanks))
@@ -203,6 +215,11 @@ class Cartridge: ICartridge {
     }
 
     func getNameTableMirroring() -> NameTableMirroring {
+        let result = mapper.GetNameTableMirroring()
+        if result != NameTableMirroring.Undefined {
+            return result
+        }
+
         return cartNameTableMirroring
     }
 

diff --git a/Shared/NES/Cartridge/Mapper/Mapper.swift b/Shared/NES/Cartridge/Mapper/Mapper.swift
@@ -80,6 +80,10 @@ class Mapper {
         nametableMirroring = value
     }
 
+    func GetNameTableMirroring() -> NameTableMirroring {
+        return nametableMirroring
+    }
+
     func SetPrgBankIndex16k(cpuBankIndexIn:Int, cartBankIndexIn: UInt8) {
         let cpuBankIndex = cpuBankIndexIn * 4
         let cartBankIndex = cartBankIndexIn * 4
@@ -233,6 +237,10 @@ class Mapper {
         chrBankIndices[ppuBankIndex_ + 7] = cartBankIndex_ + 7;
     }
 
+    func PrgMemorySize() -> UInt {
+        return UInt(numPrgBanks) * Mapper.kPrgBankSize
+    }
+
     static var kPrgBankCount:UInt = 8
     static var kPrgBankSize:UInt = KB(4)
     static var kChrBankCount:UInt = 8

diff --git a/Shared/NES/Cartridge/Mapper/Mapper1.swift b/Shared/NES/Cartridge/Mapper/Mapper1.swift
@@ -6,6 +6,214 @@
 //
 
 import Foundation
+class LoadRegister {
+
+    init() {
+        Reset()
+    }
+
+    //func LoadRegister() {
+    //    Reset()
+    //}
+
+    func Reset() {
+        m_value.clearAll()
+        m_bitsWritten = 0
+    }
+
+    func SetBit(bit:UInt8) {
+
+        //"All bits already written, must Reset"
+        assert(m_bitsWritten < 5)
+
+        var enable:UInt8 = 0
+        if (bit & 0x01) != 0 {
+            enable = 1
+        }
+
+        m_value.setPos(bitPos: m_bitsWritten, enabled: enable)
+        //m_value.SetPos(m_bitsWritten, (bit & 0x01) != 0);
+        m_bitsWritten += 1
+    }
+
+    func AllBitsSet() -> Bool {
+        return m_bitsWritten == 5
+    }
+
+    func Value() -> UInt8 {
+        return m_value.value()
+    }
+
+    var m_bitsWritten:UInt8 = 0
+    var m_value:Bitfield8 = Bitfield8()
+}
+
 class Mapper1: Mapper {
 
+    override func OnCpuWrite(cpuAddress:UInt16, value:UInt8) {
+        if (cpuAddress < 0x8000) {
+            return
+        }
+
+        let reset:Bool = (value & BIT(7)) != 0
+
+        if reset {
+            m_loadReg.Reset()
+            m_controlReg.set(BITS([2,3]))
+        }
+        else {
+            let dataBit:UInt8 = value & BIT(0)
+            m_loadReg.SetBit(bit: dataBit)
+
+            if m_loadReg.AllBitsSet() {
+                switch (cpuAddress & 0xE000) {
+                    case 0x8000:
+                        m_controlReg.setValue(m_loadReg.Value())
+                        UpdatePrgBanks()
+                        UpdateChrBanks()
+                        UpdateMirroring()
+
+                        print("Load register")
+                        break
+
+                    case 0xA000:
+                        let value = m_loadReg.Value()
+                        m_chrReg0.setValue(m_loadReg.Value())
+
+                        // Hijacks CHR reg bit 4 to select PRG 256k bank
+                        if (m_boardType == BoardType.SUROM) {
+                            UpdatePrgBanks()
+                        }
+
+                        UpdateChrBanks()
+                        break
+
+                    case 0xC000:
+                        let value = m_loadReg.Value()
+                        m_chrReg1.setValue(m_loadReg.Value())
+                        //UpdateChrBanks()
+                        break;
+
+                    case 0xE000:
+                        let value = m_loadReg.Value()
+                        m_prgReg.setValue(m_loadReg.Value())
+                        UpdatePrgBanks()
+                        break
+
+                    default:
+                        assert(false)
+                        break
+                }
+
+                m_loadReg.Reset()
+            }
+        }
+    }
+
+    var m_controlReg:Bitfield8 = Bitfield8()
+    var m_chrReg0:Bitfield8 = Bitfield8()
+    var m_chrReg1:Bitfield8 = Bitfield8()
+    var m_prgReg:Bitfield8 = Bitfield8()
+
+    enum BoardType :UInt8{
+        case DEFAULT
+        case SUROM
+    }
+    var m_boardType:BoardType  = BoardType.DEFAULT
+
+    var m_loadReg:LoadRegister = LoadRegister()
+    override func postInitialize() {
+        m_boardType = BoardType.DEFAULT
+
+        if (PrgMemorySize() == KB(512)) {
+            m_boardType = BoardType.SUROM
+        }
+
+        m_loadReg.Reset()
+
+        m_controlReg.setValue(BITS([2,3]))
+        m_chrReg0.clearAll()
+        m_chrReg1.clearAll()
+        m_prgReg.clearAll()
+
+        UpdatePrgBanks()
+        UpdateChrBanks()
+        UpdateMirroring()
+    }
+
+    func UpdatePrgBanks() {
+        let bankMode = m_controlReg.read(BITS([2,3])) >> 2
+
+        // 32k mode
+        if (bankMode <= 1) {
+            let mask = NumPrgBanks32k() - 1
+            let cartBankIndex = (m_prgReg.read(BITS([0,1,2,3])) >> 1) & mask
+
+            SetPrgBankIndex32k(cpuBankIndexIn: 0, cartBankIndexIn: cartBankIndex)
+        }
+        // 16k mode
+        else {
+            var mask:UInt8 = NumPrgBanks16k() - 1
+            if mask > 16 {
+                mask = 16
+                assert(true)
+                print("ERROR")
+            }
+            var cartBankIndex = m_prgReg.read(BITS([0,1,2,3])) & mask
+            var firstBankIndex:UInt8 = 0
+            var lastBankIndex = (NumPrgBanks16k() - 1) & mask
+
+            if m_boardType == BoardType.SUROM {
+                let prgBankSelect256k = m_chrReg0.read(BIT(4))
+                cartBankIndex |= prgBankSelect256k
+                firstBankIndex |= prgBankSelect256k
+                lastBankIndex |= prgBankSelect256k
+            }
+
+            if bankMode == 2 {
+                SetPrgBankIndex16k(cpuBankIndexIn: 0, cartBankIndexIn: firstBankIndex)
+                SetPrgBankIndex16k(cpuBankIndexIn: 1, cartBankIndexIn: cartBankIndex)
+            }
+            else {
+                SetPrgBankIndex16k(cpuBankIndexIn: 0, cartBankIndexIn: cartBankIndex)
+                SetPrgBankIndex16k(cpuBankIndexIn: 1, cartBankIndexIn: lastBankIndex)
+            }
+        }
+
+        let bSavRamChipEnabled = m_prgReg.readPos(4) == 0
+        SetCanWriteSavMemory(bSavRamChipEnabled)
+    }
+
+    func UpdateChrBanks() {
+        let mode8k:Bool = m_controlReg.readPos(4) == 0
+
+        if mode8k {
+            let mask = NumChrBanks8k() - 1
+
+            let value = (m_chrReg0.value() >> 1) & mask
+            SetChrBankIndex8k(ppuBankIndexIn: 0, cartBankIndexIn: value)
+        }
+        else {
+            let mask = NumChrBanks4k() - 1
+            let value_0 = m_chrReg0.value() & mask
+            let value_1 = m_chrReg1.value() & mask
+            SetChrBankIndex4k(ppuBankIndex: 0, cartBankIndex: value_0)
+            SetChrBankIndex4k(ppuBankIndex: 1, cartBankIndex: value_1)
+        }
+    }
+
+    func UpdateMirroring() {
+        let table:[NameTableMirroring] =
+        [
+            NameTableMirroring.OneScreenLower,
+            NameTableMirroring.OneScreenUpper,
+            NameTableMirroring.Vertical,
+            NameTableMirroring.Horizontal,
+        ]
+
+        let mirroringType = m_controlReg.read(BITS([0,1]))
+
+        print("mirroringType->"+String(mirroringType))
+        SetNameTableMirroring(table[Int(mirroringType)])
+    }
 }