Chip6526.cs

using System;
using BizHawk.Common;

namespace BizHawk.Emulation.Cores.Computers.Commodore64.MOS
{
	// MOS technology 6526 "CIA"
	//
	// emulation notes:
	// * CS, R/W and RS# pins are not emulated. (not needed)
	// * A low RES pin is emulated via HardReset().

	public static class Chip6526
	{
	    public static Cia Create(C64.CiaType type, Func<int> readIec)
	    {
            switch (type)
            {
                case C64.CiaType.Ntsc:
                    return new Cia(14318181, 14*60, readIec)
                    {
                        DelayedInterrupts = true
                    };
                case C64.CiaType.NtscRevA:
                    return new Cia(14318181, 14 * 60, readIec)
                    {
                        DelayedInterrupts = false
                    };
                case C64.CiaType.Pal:
                    return new Cia(17734472, 18 * 50, readIec)
                    {
                        DelayedInterrupts = true
                    };
                case C64.CiaType.PalRevA:
                    return new Cia(17734472, 18 * 50, readIec)
                    {
                        DelayedInterrupts = false
                    };
                default:
                    throw new Exception("Unrecognized CIA timer type.");
            }
        }

        public static Cia Create(C64.CiaType type, Func<bool[]> keyboard, Func<bool[]> joysticks)
	    {
	        switch (type)
	        {
	            case C64.CiaType.Ntsc:
                    return new Cia(14318181, 14 * 60, keyboard, joysticks)
                    {
                        DelayedInterrupts = true
                    };
                case C64.CiaType.NtscRevA:
                    return new Cia(14318181, 14 * 60, keyboard, joysticks)
                    {
                        DelayedInterrupts = false
                    };
                case C64.CiaType.Pal:
                    return new Cia(17734472, 18 * 50, keyboard, joysticks)
                    {
                        DelayedInterrupts = true
                    };
                case C64.CiaType.PalRevA:
                    return new Cia(17734472, 18 * 50, keyboard, joysticks)
                    {
                        DelayedInterrupts = false
                    };
                default:
                    throw new Exception("Unrecognized CIA timer type.");
            }
        }
    }
}