ParsonsMasterSystem2026/Core/SmsMachine.cs

using Core.Cpu;
using Core.Io;
using Core.Memory;

namespace Core
{
    public class SmsMachine
    {
        public Z80 Cpu { get; private set; }
        public SmsMemoryBus MemoryBus { get; private set; }
        public SmsIoBus IoBus { get; private set; }
        public ushort? Breakpoint { get; set; } = null;

        // NTSC SMS T-States per frame
        public const int TStatesPerFrame = 59736;
        public long TotalFrameCount { get; private set; } = 0;
        public double FramesPerSecond { get; private set; } = 0;
        public double FrameTime { get; private set; } = 0;

        public SmsMachine()
        {
            MemoryBus = new SmsMemoryBus();
            IoBus = new SmsIoBus();
            Cpu = new Z80(MemoryBus, IoBus);
        }

        public void LoadCartridge(byte[] romData)
        {
            MemoryBus.LoadCartridge(romData);
            Reset();
        }

        public void Reset()
        {
            MemoryBus.CleanRAMData();
            Cpu.Reset();

            // We will reset the VDP and PSG here later!
        }

        public void RunFrame()
        {
            long currentFrameTStates = 0;

            while (currentFrameTStates < TStatesPerFrame)
            {
                int tStates = Cpu.Step();
                currentFrameTStates += tStates;

                // --- FUTURE EXPANSION ---
                // VideoProcessor.Update(tStates);
                // AudioProcessor.Update(tStates);

                // if (VideoProcessor.IsVBlanking && VideoProcessor.InterruptsEnabled)
                // {
                //     Cpu.RequestInterrupt();
                // }
            }
        }
    }
}