Apple II+ boots

FruitMachine/AppleII/AppleIIBase.swift

@@ -0,0 +1,198 @@
+//
+//  EmulatedSystem.swift
+//  FruitMachine
+//
+//  Created by Christopher Rohl on 8/1/17.
+//  Copyright © 2017 Christopher Rohl. All rights reserved.
+//
+
+import Cocoa
+
+protocol EmulatedSystem {
+    var CPU_FREQUENCY: Double { get }
+    var FRAMES_PER_SECOND: Double { get }
+    var CYCLES_PER_BATCH: Int { get }
+    
+    init(cpuFrequency: Double, fps: Double, delegate: AppleIIBase.ScreenDelegate, view: AppleIIBase.ScreenView)
+    func installOverrides()
+    func loadROMs()
+}
+
+var EmulatedSystemInstance: AppleIIBase?
+
+class AppleIIBase: NSObject, EmulatedSystem {
+    //Peripherals
+    var backplane = [Int: Peripheral?]()
+    var frameCounter: Int = 0
+    
+    var CPU_FREQUENCY: Double
+    var FRAMES_PER_SECOND: Double
+    var CYCLES_PER_BATCH: Int
+    
+    var videoSoftswitches = VideoSoftswitches()
+    var videoMode: VideoMode = .Text
+    
+    let cg = A2CharacterGenerator(romPath: "/Users/luigi/apple2/a2.chr");
+    let keyboardController = KeyboardController()
+    
+    var emulatorViewDelegate: ScreenDelegate
+    var emulatorView: ScreenView
+    var emuScreenLayer = CALayer()
+    
+    required init(cpuFrequency: Double, fps: Double, delegate: ScreenDelegate, view: ScreenView) {
+        CPU_FREQUENCY = cpuFrequency
+        FRAMES_PER_SECOND = fps
+        CYCLES_PER_BATCH = Int(CPU_FREQUENCY / FRAMES_PER_SECOND)
+        
+        emulatorViewDelegate = delegate
+        emulatorView = view
+        
+        super.init()
+        
+        for i in 0...7 {
+            backplane[i] = nil
+        }
+        
+        setupMemory(ramConfig: .fortyeightK)
+        setupPeripherals()
+
+        emuScreenLayer.shouldRasterize = true
+        emuScreenLayer.delegate = emulatorViewDelegate
+        emuScreenLayer.frame = emulatorView.bounds
+        
+        emulatorView.wantsLayer = true
+        emulatorView.layer?.addSublayer(emuScreenLayer)
+        
+        installOverrides()
+    }
+    
+    enum MemoryConfiguration {
+        case fourK
+        case sixteenK
+        case fortyeightK
+    }
+    
+    func setupMemory(ramConfig: MemoryConfiguration) {
+        let ramPages: Int
+        
+        switch ramConfig {
+        case .fourK:
+            ramPages = 4096 / 256
+        case .sixteenK:
+            ramPages = 16384 / 256
+        case .fortyeightK:
+            ramPages = 49152 / 256
+        }
+        
+        for page in 0 ..< ramPages {
+            CPU.sharedInstance.memoryInterface.pages[page] = MemoryInterface.pageMode.rw    //RAM
+        }
+        for page in ramPages ..< 192 {
+            CPU.sharedInstance.memoryInterface.pages[page] = MemoryInterface.pageMode.null  //not connected
+        }
+        for page in 208 ..< 256 {
+            CPU.sharedInstance.memoryInterface.pages[page] = MemoryInterface.pageMode.ro    //ROM
+        }
+    }
+    
+    func setupPeripherals() {
+        let defaults = UserDefaults.standard
+        
+        /*
+        let slot0 = defaults.string(forKey: "a2_Peripherals_Slot0")
+        if(slot0 == "Language Card (16K)") {
+            backplane[0] = LanguageCard16K(slot: 0, romPath: "/Users/luigi/apple2/341-0020-00.f8")
+        }
+         */
+        
+        let slot6 = defaults.string(forKey: "a2_Peripherals_Slot6")
+        if(slot6 == "Disk II") {
+            backplane[6] = DiskII(slot: 6, romPath: "/Users/luigi/apple2/341-0027-a.p5")
+            
+            let drive = backplane[6]! as! DiskII
+            //drive.attachDiskImage(imagePath: "/Users/luigi/apple2/Apex II - Apple II Diagnostic (v4.7-1986).DSK")
+            drive.attachDiskImage(imagePath: "/Users/luigi/apple2/clean332sysmas.do")
+        }
+    }
+    
+    func doReset() {
+        videoSoftswitches.reset()
+        videoMode = .Text
+        CPU.sharedInstance.performReset()
+    }
+    
+    func runFrame() {
+        frameCounter = (frameCounter + 1) % 60
+        if(frameCounter % 15) == 0 {
+            emulatorViewDelegate.flashIsInverse = !emulatorViewDelegate.flashIsInverse
+        }
+        
+        CPU.sharedInstance.cycles = 0
+        CPU.sharedInstance.cyclesInBatch = CYCLES_PER_BATCH
+        CPU.sharedInstance.runCyclesBatch()
+        
+        //update the video display
+        CVPixelBufferLockBaseAddress(emulatorViewDelegate.pixels!, CVPixelBufferLockFlags(rawValue: 0))
+        let pixelBase = CVPixelBufferGetBaseAddress(emulatorViewDelegate.pixels!)
+        let buf = pixelBase?.assumingMemoryBound(to: BitmapPixelsLE555.PixelData.self)
+        
+        videoMode = getCurrentVideoMode(switches: videoSoftswitches)
+        
+        if(videoMode == .Text)
+        {
+            //Text mode: Get character codes from $0400-$07FF
+            putGlyphs(buffer: buf!, start: 0x400, end: 0x7F8)
+        }
+        else if(videoMode == .Lores)
+        {
+            putLoresPixels(buffer: buf!, start: 0x400, end: 0x7F8)
+        }
+        else if(videoMode == .MixedLores) {
+            //Draw the lores pixel rows.
+            putLoresPixels(buffer: buf!, start: 0x400, end: 0x650)
+            putLoresPixels(buffer: buf!, start: 0x680, end: 0x6A8)
+            putLoresPixels(buffer: buf!, start: 0x700, end: 0x728)
+            putLoresPixels(buffer: buf!, start: 0x780, end: 0x7A8)
+            putLoresPixels(buffer: buf!, start: 0x6A8, end: 0x6D0)
+            putLoresPixels(buffer: buf!, start: 0x728, end: 0x750)
+            putLoresPixels(buffer: buf!, start: 0x7A8, end: 0x7D0)
+            
+            //Draw the bottom 4 text rows.
+            putGlyphs(buffer: buf!, start: 0x650, end: 0x678)
+            putGlyphs(buffer: buf!, start: 0x6D0, end: 0x6F8)
+            putGlyphs(buffer: buf!, start: 0x750, end: 0x778)
+            putGlyphs(buffer: buf!, start: 0x7D0, end: 0x7F8)
+        } else {
+            print("Unimplemented video mode!")
+        }
+        
+        CVPixelBufferUnlockBaseAddress(emulatorViewDelegate.pixels!, CVPixelBufferLockFlags(rawValue: 0))
+        emulatorView.setNeedsDisplay(emulatorView.frame)
+    }
+    
+    /* Video */
+    func putLoresPixels(buffer: UnsafeMutablePointer<BitmapPixelsLE555.PixelData>, start: UInt16, end: UInt16) {
+        for address in start ..< end {
+            let pixelData = CPU.sharedInstance.memoryInterface.readByte(offset: UInt16(address), bypassOverrides: true)
+            
+            LoresMode.putLoresPixel(buffer: buffer,
+                                    pixel: pixelData,
+                                    address: UInt16(address))
+        }
+    }
+    
+    func putGlyphs(buffer: UnsafeMutablePointer<BitmapPixelsLE555.PixelData>, start: UInt16, end: UInt16) {
+        for address in start ... end {
+            let charCode = CPU.sharedInstance.memoryInterface.readByte(offset: UInt16(address), bypassOverrides: true)
+            
+            TextMode.putGlyph(buffer: buffer,
+                              glyph: cg.glyphs[Int(charCode & 0x3F)],
+                              attributes: charCode & 0xC0, //d6 and d7
+                pixelPosition: VideoHelpers.getPixelOffset(memoryOffset: Int(address - 0x400)))
+        }
+    }
+    
+    func installOverrides() { }
+    func loadROMs() { }
+    
+}

FruitMachine/AppleIIViewController.swift

@@ -21,7 +21,7 @@ class AppleIIViewController: NSViewController {
     override func viewDidLoad() {
         super.viewDidLoad()
         // Do view setup here.
-        EmulatedSystemInstance = AppleII.sharedInstance
+        EmulatedSystemInstance = AppleIIPlus.sharedInstance
         
         preferencesWindowController = PreferencesWindowController()
         self.view.addSubview(EmulatedSystemInstance!.emulatorView)