37 lines
1.5 KiB
Swift
37 lines
1.5 KiB
Swift
//
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// SoftswitchOverrides.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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extension AppleII {
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class SoftswitchOverrides: NSObject {
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static let readKeyboard = ReadOverride(start: 0xC000, end: 0xC000, readAnyway: false, action: SoftswitchOverrides.actionReadKeyboard)
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static func actionReadKeyboard(dummy: AnyObject, byte: UInt8?) -> UInt8? {
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let b = CPU.sharedInstance.memoryInterface.readByte(offset: 0xC000, bypassOverrides: true)
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CPU.sharedInstance.memoryInterface.writeByte(offset: 0xC000, value: b)
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return b
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}
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static let clearKeypressStrobeR = ReadOverride(start: 0xC010, end: 0xC010, readAnyway: false, action: SoftswitchOverrides.actionClearKeypressStrobe)
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static let clearKeypressStrobeW = WriteOverride(start: 0xC010, end: 0xC010, writeAnyway: false, action: SoftswitchOverrides.actionClearKeypressStrobe)
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static func actionClearKeypressStrobe(dummy: AnyObject, byte: UInt8?) -> UInt8? {
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//Clears b7 of $C000 on write.
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let b = CPU.sharedInstance.memoryInterface.readByte(offset: 0xC000, bypassOverrides: true)
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CPU.sharedInstance.memoryInterface.writeByte(offset: 0xC000, value: b & 0x7F, bypassOverrides: true)
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//CPU.sharedInstance.memoryInterface.writeByte(offset: 0xC010, value: b & 0x7F, bypassOverrides: true)
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return b
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}
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}
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}
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