59 lines
2.2 KiB
Swift
59 lines
2.2 KiB
Swift
//
|
|
// Overrides.swift
|
|
// FruitMachine
|
|
//
|
|
// Created by Christopher Rohl on 7/27/17.
|
|
// Copyright © 2017 Christopher Rohl. All rights reserved.
|
|
//
|
|
|
|
import Cocoa
|
|
|
|
class PIAOverrides: NSObject {
|
|
static let writeDSP = WriteOverride(start: 0xD012, end: 0xD012, writeAnyway: false, action: PIAOverrides.actionWriteDSP)
|
|
static func actionWriteDSP(terminal: AnyObject, byte: UInt8?) -> UInt8? {
|
|
|
|
let pia = AppleI.sharedInstance.pia["display"]!
|
|
|
|
if(pia.getMode() == .Output) {
|
|
//Writing to DSP sets DSP.7
|
|
AppleI.sharedInstance.pia["display"]!.data = byte! | 0x80
|
|
|
|
//Output our character to the terminal
|
|
AppleI.sharedInstance.terminal.putCharacter(charIndex: byte!)
|
|
|
|
AppleI.sharedInstance.pia["display"]!.data = byte! & ~(0x80)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
static let writeDSPCR = WriteOverride(start: 0xD013, end: 0xD013, writeAnyway: false, action: PIAOverrides.actionWriteDSPCR)
|
|
static func actionWriteDSPCR(terminal: AnyObject, byte: UInt8?) -> UInt8? {
|
|
AppleI.sharedInstance.pia["display"]?.control = byte!
|
|
return nil
|
|
}
|
|
|
|
static let readDSP = ReadOverride(start: 0xD012, end: 0xD012, readAnyway: false, action: PIAOverrides.actionReadDSP)
|
|
static func actionReadDSP(terminal: AnyObject, byte: UInt8?) -> UInt8? {
|
|
|
|
//DSP.7 is unset when the character is accepted by the terminal
|
|
return AppleI.sharedInstance.pia["display"]!.data
|
|
}
|
|
/* */
|
|
|
|
static let readKBDCR = ReadOverride(start: 0xD011, end: 0xD011, readAnyway: false, action: PIAOverrides.actionReadKBDCR)
|
|
static func actionReadKBDCR(terminal: AnyObject, byte: UInt8?) -> UInt8? {
|
|
return AppleI.sharedInstance.pia["keyboard"]!.control
|
|
}
|
|
|
|
/* */
|
|
static let readKBD = ReadOverride(start: 0xD010, end: 0xD010, readAnyway: false, action: PIAOverrides.actionReadKBD)
|
|
static func actionReadKBD(terminal: AnyObject, byte: UInt8?) -> UInt8? {
|
|
//Reading KBD clears KBDCR.7
|
|
AppleI.sharedInstance.pia["keyboard"]!.control = AppleI.sharedInstance.pia["keyboard"]!.control & ~(0x80)
|
|
|
|
//KBD.7 is tied to +5V
|
|
return AppleI.sharedInstance.pia["keyboard"]!.data | 0x80
|
|
}
|
|
|
|
}
|