toptensoftware

[EntryPoint(0x0021)]
public bool TextOut(HDC hDC, nint x, nint y, uint pszString, nint cbString)
{
    // Get the buffer backing pszString
    int offset;
    var buf = _machine.GlobalHeap.GetBuffer(pszString, false, out offset);
    if (buf == null)
        return false;
    
    // Read the string from the buffer, using length param

toptensoftware

class CPU
{
    // Registers
    public ushort ax;
    public ushort bx;
    // etc...
    
    // Busses
    public IMemoryBus MemoryBus { get; set; }
    public IPortBus PortBus { get; set; }

toptensoftware

void RunCode()
{
    _cpu = new CPU();
    _cpu.MemoryBus = new GlobalHeap();
    
    while (!_theEndOfTime)
    {
        _cpu.Step();
    }
}

toptensoftware

public interface IDebugger
{
    bool OnStep();
    bool OnSoftwareInterrupt(byte interruptNumber);
} 

toptensoftware

public interface IDebugger
{
    bool OnStep();
    bool OnSoftwareInterrupt(byte interruptNumber);
} 

toptensoftware

public class Disassembler
{
    // Machine code read from here
    public IMemoryBus MemoryBus { get; set; }
    
    // Using this address
    public ushort cs { get; set; }
    public ushort ip { get; set; }

    // Read disassembled instruction here

toptensoftware

public abstract class BreakPoint
{
    // Check if this break point wants the debugger to stop
    public abstract bool ShouldBreak(DebuggerCore debugger);

    [Json("number")]
    public int Number { get; set; }

    [Json("enabled")]
    public bool Enabled { get; set; }

toptensoftware

public class CodeBreakPoint : BreakPoint
{
    public CodeBreakPoint(ushort segment, ushort offset)
    {
        Segment = segment;
        Offset = offset;
    }

    public ushort Segment;
    public ushort Offset;

toptensoftware

public class CodeBreakPoint : BreakPoint
{
    public CodeBreakPoint(ushort segment, ushort offset)
    {
        Segment = segment;
        Offset = offset;
    }

    public ushort Segment;
    public ushort Offset;

toptensoftware

void IDebugger.OnStep()
{
    // Test all break points
    for (int i=0; i<_allBreakPoints.Count; i++)
    {
        if (bp.Enabled && bp.ShouldBreak(this))
        {
            _break = true;
        }
    }