211 lines
8.5 KiB
Swift
211 lines
8.5 KiB
Swift
//
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// AppleII.swift
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// FruitMachine
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//
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// Created by Christopher Rohl on 8/1/17.
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// Copyright © 2017 Christopher Rohl. All rights reserved.
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//
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import Cocoa
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final class AppleII: NSObject, EmulatedSystem {
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static let sharedInstance = AppleII(cpuFrequency: (14.31818 / 7 / 2) * 1000000, fps: 60.0)
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var frameCounter: Int = 0
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let cg = A2CharacterGenerator(romPath: "/Users/luigi/apple2/a2.chr");
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let keyboardController = KeyboardController()
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var videoSoftswitches = VideoSoftswitches()
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var videoMode: VideoMode
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//Peripherals
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var backplane = [Int: Peripheral?]()
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var CPU_FREQUENCY: Double
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var FRAMES_PER_SECOND: Double
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var CYCLES_PER_BATCH: Int
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let emulatorViewDelegate = AppleII.ScreenDelegate()
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let emulatorView = AppleII.ScreenView(frame: NSMakeRect(0, 16, 560, 384))
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let emuScreenLayer = CALayer()
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required init(cpuFrequency: Double, fps: Double) {
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CPU_FREQUENCY = cpuFrequency
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FRAMES_PER_SECOND = fps
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CYCLES_PER_BATCH = Int(cpuFrequency / fps)
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videoMode = .Text
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for i in 1...7 {
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backplane[i] = nil
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}
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backplane[6] = DiskII(slot: 6, romPath: "/Users/luigi/apple2/341-0027-a.p5")
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super.init()
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loadROMs()
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setupMemory(ramConfig: .fortyeightK)
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emuScreenLayer.shouldRasterize = true
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emuScreenLayer.delegate = emulatorViewDelegate
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emuScreenLayer.frame = emulatorView.bounds
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emulatorView.wantsLayer = true
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emuScreenLayer.setNeedsDisplay()
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emulatorView.layer?.addSublayer(emuScreenLayer)
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installOverrides()
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doReset()
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}
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func doReset() {
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videoSoftswitches.reset()
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videoMode = .Text
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CPU.sharedInstance.performReset()
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}
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func loadROMs() {
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CPU.sharedInstance.memoryInterface.loadBinary(path: "/Users/luigi/apple2/341-0001-00.e0", offset: 0xE000, length: 0x800)
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CPU.sharedInstance.memoryInterface.loadBinary(path: "/Users/luigi/apple2/341-0002-00.e8", offset: 0xE800, length: 0x800)
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CPU.sharedInstance.memoryInterface.loadBinary(path: "/Users/luigi/apple2/341-0003-00.f0", offset: 0xF000, length: 0x800)
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CPU.sharedInstance.memoryInterface.loadBinary(path: "/Users/luigi/apple2/341-0004-00.f8", offset: 0xF800, length: 0x800)
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}
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func installOverrides() {
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for (slotNum, peripheral) in backplane {
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if(peripheral != nil) {
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peripheral!.installOverrides()
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}
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}
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CPU.sharedInstance.memoryInterface.read_overrides.append(SoftswitchOverrides.readKeyboard)
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CPU.sharedInstance.memoryInterface.read_overrides.append(SoftswitchOverrides.clearKeypressStrobeR)
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CPU.sharedInstance.memoryInterface.write_overrides.append(SoftswitchOverrides.clearKeypressStrobeW)
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CPU.sharedInstance.memoryInterface.read_overrides.append(SoftswitchOverrides.switchC050R)
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CPU.sharedInstance.memoryInterface.read_overrides.append(SoftswitchOverrides.switchC051R)
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CPU.sharedInstance.memoryInterface.read_overrides.append(SoftswitchOverrides.switchC052R)
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CPU.sharedInstance.memoryInterface.read_overrides.append(SoftswitchOverrides.switchC053R)
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CPU.sharedInstance.memoryInterface.read_overrides.append(SoftswitchOverrides.switchC054R)
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CPU.sharedInstance.memoryInterface.read_overrides.append(SoftswitchOverrides.switchC055R)
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CPU.sharedInstance.memoryInterface.read_overrides.append(SoftswitchOverrides.switchC056R)
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CPU.sharedInstance.memoryInterface.read_overrides.append(SoftswitchOverrides.switchC057R)
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CPU.sharedInstance.memoryInterface.write_overrides.append(SoftswitchOverrides.switchC050W)
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CPU.sharedInstance.memoryInterface.write_overrides.append(SoftswitchOverrides.switchC051W)
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CPU.sharedInstance.memoryInterface.write_overrides.append(SoftswitchOverrides.switchC052W)
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CPU.sharedInstance.memoryInterface.write_overrides.append(SoftswitchOverrides.switchC053W)
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CPU.sharedInstance.memoryInterface.write_overrides.append(SoftswitchOverrides.switchC054W)
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CPU.sharedInstance.memoryInterface.write_overrides.append(SoftswitchOverrides.switchC055W)
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CPU.sharedInstance.memoryInterface.write_overrides.append(SoftswitchOverrides.switchC056W)
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CPU.sharedInstance.memoryInterface.write_overrides.append(SoftswitchOverrides.switchC057W)
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}
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func runFrame() {
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frameCounter = (frameCounter + 1) % 60
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if(frameCounter % 15) == 0 {
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emulatorViewDelegate.flashIsInverse = !emulatorViewDelegate.flashIsInverse
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}
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CPU.sharedInstance.cycles = 0
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CPU.sharedInstance.cyclesInBatch = CYCLES_PER_BATCH
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CPU.sharedInstance.runCyclesBatch()
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//update the video display
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CVPixelBufferLockBaseAddress(emulatorViewDelegate.pixels!, CVPixelBufferLockFlags(rawValue: 0))
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let pixelBase = CVPixelBufferGetBaseAddress(emulatorViewDelegate.pixels!)
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let buf = pixelBase?.assumingMemoryBound(to: BitmapPixelsLE555.PixelData.self)
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videoMode = getCurrentVideoMode(switches: videoSoftswitches)
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if(videoMode == .Text)
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{
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//Text mode: Get character codes from $0400-$07FF
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putGlyphs(buffer: buf!, start: 0x400, end: 0x7F8)
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}
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else if(videoMode == .Lores)
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{
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putLoresPixels(buffer: buf!, start: 0x400, end: 0x7F8)
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}
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else if(videoMode == .MixedLores) {
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//Draw the lores pixel rows.
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putLoresPixels(buffer: buf!, start: 0x400, end: 0x650)
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putLoresPixels(buffer: buf!, start: 0x680, end: 0x6A8)
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putLoresPixels(buffer: buf!, start: 0x700, end: 0x728)
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putLoresPixels(buffer: buf!, start: 0x780, end: 0x7A8)
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putLoresPixels(buffer: buf!, start: 0x6A8, end: 0x6D0)
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putLoresPixels(buffer: buf!, start: 0x728, end: 0x750)
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putLoresPixels(buffer: buf!, start: 0x7A8, end: 0x7D0)
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//Draw the bottom 4 text rows.
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putGlyphs(buffer: buf!, start: 0x650, end: 0x678)
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putGlyphs(buffer: buf!, start: 0x6D0, end: 0x6F8)
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putGlyphs(buffer: buf!, start: 0x750, end: 0x778)
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putGlyphs(buffer: buf!, start: 0x7D0, end: 0x7F8)
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} else {
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print("Unimplemented video mode!")
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}
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CVPixelBufferUnlockBaseAddress(emulatorViewDelegate.pixels!, CVPixelBufferLockFlags(rawValue: 0))
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emulatorView.setNeedsDisplay(emulatorView.frame)
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}
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func putLoresPixels(buffer: UnsafeMutablePointer<BitmapPixelsLE555.PixelData>, start: UInt16, end: UInt16) {
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for address in start ..< end {
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let pixelData = CPU.sharedInstance.memoryInterface.readByte(offset: UInt16(address), bypassOverrides: true)
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LoresMode.putLoresPixel(buffer: buffer,
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pixel: pixelData,
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address: UInt16(address))
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}
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}
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func putGlyphs(buffer: UnsafeMutablePointer<BitmapPixelsLE555.PixelData>, start: UInt16, end: UInt16) {
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for address in start ... end {
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let charCode = CPU.sharedInstance.memoryInterface.readByte(offset: UInt16(address), bypassOverrides: true)
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TextMode.putGlyph(buffer: buffer,
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glyph: cg.glyphs[Int(charCode & 0x3F)],
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attributes: charCode & 0xC0, //d6 and d7
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pixelPosition: VideoHelpers.getPixelOffset(memoryOffset: Int(address - 0x400)))
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}
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}
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enum MemoryConfiguration {
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case fourK
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case sixteenK
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case fortyeightK
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}
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func setupMemory(ramConfig: MemoryConfiguration) {
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let ramPages: Int
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switch ramConfig {
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case .fourK:
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ramPages = 4096 / 256
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case .sixteenK:
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ramPages = 16384 / 256
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case .fortyeightK:
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ramPages = 49152 / 256
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}
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for page in 0 ..< ramPages {
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CPU.sharedInstance.memoryInterface.pages[page] = MemoryInterface.pageMode.rw //RAM
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}
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for page in ramPages ..< 192 {
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CPU.sharedInstance.memoryInterface.pages[page] = MemoryInterface.pageMode.null //not connected
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}
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for page in 224 ..< 256 {
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CPU.sharedInstance.memoryInterface.pages[page] = MemoryInterface.pageMode.ro //ROM
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}
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}
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@objc func debuggerBreak() {
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}
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}
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