131 lines
4.8 KiB
Swift
131 lines
4.8 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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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 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, 0, 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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super.init()
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loadROMs()
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setupMemory(ramConfig: .sixteenK)
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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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CPU.sharedInstance.performReset()
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}
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func loadROMs() {
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/*
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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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CPU.sharedInstance.memoryInterface.loadBinary(path: "/Users/luigi/6502/test.bin", offset: 0x0000, length: 0x10000)
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}
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func installOverrides() {
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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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}
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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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//TODO
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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: BitmapPixelsBE555.PixelData.self)
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//Text mode: Get character codes from $0400-$07FF
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for address in 0x0400 ..< 0x07F8 {
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let charCode = CPU.sharedInstance.memoryInterface.readByte(offset: UInt16(address), bypassOverrides: true)
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emulatorViewDelegate.putGlyph(buffer: buf,
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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: emulatorViewDelegate.getPixelOffset(memoryOffset: address - 0x400))
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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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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 //not connected
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}
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}
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}
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