initial commit

.gitignore

@@ -44,6 +44,10 @@
 *.a
 *.o
 *.ocx
+*.res
+*.dproj
+basic*.bin
+kernal*.bin
 
 # Delphi autogenerated files (duplicated info)
 *.cfg

C64/ROMs/README.md

@@ -0,0 +1 @@
+Put your BASIC and Kernal ROMs here

C64/Source/C64.Thread.pas

@@ -0,0 +1,41 @@
+unit C64.Thread;
+
+interface
+
+uses
+  System.Classes, C64;
+
+type
+  TC64Thread = class(TThread)
+  private
+    C64: TC64;
+  protected
+  public
+    procedure Execute; override;
+    constructor Create(C64Instance: TC64);
+    destructor Destroy; override;
+  end;
+
+implementation
+
+{ TC64Thread }
+
+constructor TC64Thread.Create(C64Instance: TC64);
+begin
+  inherited Create(True);
+  C64 := C64Instance;
+end;
+
+destructor TC64Thread.Destroy;
+begin
+
+  inherited;
+end;
+
+procedure TC64Thread.Execute;
+begin
+  inherited;
+
+end;
+
+end.

C64/Source/C64.pas

@@ -0,0 +1,197 @@
+unit C64;
+
+interface
+
+uses
+  System.Classes, WinApi.Messages, MOS6502;
+
+const
+  WM_SCREEN_WRITE = WM_USER + 0;
+
+  CIA1 = $DC00;
+  KEY_TRANSLATION = '1£+9753'#8+#8'*piyrw'#13+#0';ljgda'#0+'2'#0'-0864'#0+' '#0'.mbcz'#0+#0'=:khfs'#0+'q'#0'@oute'#0+
+    #0'/,nvx'#0#0+'!'#0#0')'#39'%#'+#0+#0#0#0#0#0#0#0#13+#0']'#0#0#0#0#0#0+'"'#0#0#0'(&$'#0+' '#0'>'#0#0#0#0#0+
+    #0#0'['#0#0#0#0#0+#0#0#0#0#0#0#0#0+#0'?<';
+
+type
+  TC64 = class;
+  PC64 = ^TC64;
+
+  TC64Thread = class(TThread)
+  private
+    C64: TC64;
+  protected
+  public
+    procedure Execute; override;
+    constructor Create(C64Instance: TC64);
+  end;
+
+  TC64 = class(TMOS6502)
+  private
+    Thread: TC64Thread;
+    TimerHandle: Integer;
+    LastKey: Char;
+    procedure BusWrite(Adr: Word; Value: Byte);
+    function BusRead(Adr: Word): Byte;
+    function KeyRead: Byte;
+  protected
+    KeyMatrix: Array[0 .. 7, 0 .. 7] of Byte;
+    Memory: PByte;
+    InterruptRequest: Boolean;
+  public
+    WndHandle: THandle;
+    constructor Create;
+    destructor Destroy; override;
+    procedure LoadROM(Filename: String; Addr: Word);
+    procedure Exec;
+    procedure SetKey(Key: Char; Value: Byte);
+  end;
+
+implementation
+
+uses
+  System.SysUtils, Winapi.Windows, WinApi.MMSystem;
+
+{ TC64 }
+
+procedure TimerProcedure(TimerID, Msg: Uint; dwUser, dw1, dw2: DWORD); pascal;
+var
+  C64: TC64;
+begin
+  C64 := TC64(dwUser);
+
+  if C64.Status and $04 = 0 then // if IRQ allowed then set irq
+    C64.InterruptRequest := True;
+end;
+
+
+function TC64.BusRead(Adr: Word): Byte;
+begin
+  Result := Memory[Adr];
+end;
+
+procedure TC64.BusWrite(Adr: Word; Value: Byte);
+begin
+  // test for I/O requests
+  case Adr of
+    CIA1:
+      begin
+        // Handle keyboard reading
+        Memory[Adr] := Value;
+        Memory[CIA1 + 1] := KeyRead;
+      end;
+
+    CIA1 + 5: // Timer
+     if TimerHandle = 0 then
+       TimerHandle := TimeSetEvent(34, 2, @TimerProcedure, DWORD(Self), TIME_PERIODIC);
+  end;
+
+  if (Adr >= $A000) then  // treat anything above as ROM
+    Exit;
+
+  Memory[Adr] := Value;
+
+  // video RAM
+  if (Adr >= $400) and (Adr <= $07E7) then
+    PostMessage(WndHandle, WM_SCREEN_WRITE, Adr - $400, Value);
+end;
+
+constructor TC64.Create;
+begin
+  inherited Create(BusRead, BusWrite);
+
+  // create 64kB memory table
+  GetMem(Memory, 65536);
+
+  Thread := TC64Thread.Create(Self);
+end;
+
+destructor TC64.Destroy;
+begin
+  if TimerHandle <> 0 then
+    Timekillevent(TimerHandle);
+  Thread.Terminate;
+  Thread.WaitFor;
+  FreeMem(Memory);
+  inherited;
+end;
+
+procedure TC64.Exec;
+begin
+  Reset;
+  Thread.Start;
+end;
+
+function TC64.KeyRead: Byte;
+var
+  Row, Col, Cols: Byte;
+begin
+  Result := 0;
+  Cols := Memory[CIA1];
+  for Col := 0 to 7 do
+    if Cols and (1 shl Col) = 0 then  // a 0 indicates a column read
+      for Row := 0 to 7 do
+        if KeyMatrix[7 - Col, Row] = 1 then
+          Result := Result + (1 shl Row);
+  Result := not Result;
+end;
+
+procedure TC64.LoadROM(Filename: String; Addr: Word);
+var
+  Stream: TFileStream;
+begin
+  Stream := TFileStream.Create(Filename, fmOpenRead);
+  try
+    Stream.Read(Memory[Addr], Stream.Size);
+  finally
+    Stream.Free;
+  end;
+end;
+
+procedure TC64.SetKey(Key: Char; Value: Byte);
+var
+  KeyPos: Integer;
+begin
+  KeyPos := Pos(Key, KEY_TRANSLATION) - 1;
+  if KeyPos >= 0 then
+  begin
+    // always release last key on keypress
+    if Value = 1 then
+    begin
+      SetKey(LastKey, 0);
+      LastKey := Key;
+    end;
+
+    if KeyPos > 63 then  // set right shift on/off
+    begin
+      KeyMatrix[1, 4] := Value;
+      Dec(KeyPos, 64);
+    end;
+
+    KeyMatrix[KeyPos mod 8, KeyPos div 8] := Value;
+  end;
+end;
+
+{ TC64Thread }
+
+constructor TC64Thread.Create(C64Instance: TC64);
+begin
+  inherited Create(True);
+  C64 := C64Instance;
+end;
+
+procedure TC64Thread.Execute;
+begin
+  while (not Terminated) do
+  begin
+    if C64.InterruptRequest then
+    begin
+      C64.InterruptRequest := False;
+      C64.IRQ;
+    end;
+    C64.Step;
+    Sleep(0);
+  end;
+end;
+
+end.

C64/Source/C6Emu.dpr

@@ -0,0 +1,16 @@
+program C6Emu;
+
+uses
+  Vcl.Forms,
+  FormC64 in 'FormC64.pas' {FrmC64},
+  C64 in 'C64.pas',
+  MOS6502 in '..\..\Source\MOS6502.pas';
+
+{$R *.res}
+
+begin
+  Application.Initialize;
+  Application.MainFormOnTaskbar := True;
+  Application.CreateForm(TFrmC64, FrmC64);
+  Application.Run;
+end.

C64/Source/FormC64.dfm

@@ -0,0 +1,23 @@
+object FrmC64: TFrmC64
+  Left = 0
+  Top = 0
+  BorderStyle = bsDialog
+  Caption = 'C64Emu'
+  ClientHeight = 310
+  ClientWidth = 645
+  Color = clBtnFace
+  Font.Charset = DEFAULT_CHARSET
+  Font.Color = clWindowText
+  Font.Height = -11
+  Font.Name = 'Tahoma'
+  Font.Style = []
+  KeyPreview = True
+  OldCreateOrder = False
+  Position = poScreenCenter
+  OnCreate = FormCreate
+  OnDestroy = FormDestroy
+  OnKeyPress = FormKeyPress
+  OnKeyUp = FormKeyUp
+  PixelsPerInch = 96
+  TextHeight = 13
+end

C64/Source/FormC64.pas

@@ -0,0 +1,96 @@
+unit FormC64;
+
+interface
+
+uses
+  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
+  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, C64;
+
+const
+  ScreenZoom = 2;
+  ScreenWidth = 320 * ScreenZoom;
+  ScreenHeight = 200 * ScreenZoom;
+
+  ColorTable: array [0 .. 2] of Cardinal = ($801010, $D0A0A0, $D0A0A0);
+
+type
+  TFrmC64 = class(TForm)
+    procedure FormCreate(Sender: TObject);
+    procedure FormKeyUp(Sender: TObject; var Key: Word; Shift: TShiftState);
+    procedure FormKeyPress(Sender: TObject; var Key: Char);
+    procedure FormDestroy(Sender: TObject);
+  private
+    { Private declarations }
+    procedure OnScreenWrite(var Msg: TMessage); message WM_SCREEN_WRITE;
+  public
+    { Public declarations }
+    LastKey: Char;
+    C64: TC64;
+  end;
+
+var
+  FrmC64: TFrmC64;
+
+implementation
+
+{$R *.dfm}
+
+procedure TFrmC64.FormCreate(Sender: TObject);
+begin
+  ClientWidth := ScreenWidth;
+  ClientHeight := ScreenHeight;
+
+  Canvas.Font.Name := 'cbm';
+  Canvas.Font.Height := 8 * ScreenZoom;
+  Canvas.Brush.Style := bsSolid;
+
+  C64 := TC64.Create;
+  C64.WndHandle := Handle;
+  C64.LoadROM('..\ROMs\basic.901226-01.bin', $A000);
+  C64.LoadROM('..\ROMs\kernal.901227-03.bin', $E000);
+  C64.Exec;
+end;
+
+procedure TFrmC64.FormDestroy(Sender: TObject);
+begin
+  C64.Free;
+end;
+
+procedure TFrmC64.FormKeyPress(Sender: TObject; var Key: Char);
+begin
+  C64.SetKey(Key, 1);
+  LastKey := Key;
+end;
+
+procedure TFrmC64.FormKeyUp(Sender: TObject; var Key: Word; Shift: TShiftState);
+begin
+  if LastKey <> #0 then
+    C64.SetKey(LastKey, 0);
+  LastKey := #0;
+end;
+
+procedure TFrmC64.OnScreenWrite(var Msg: TMessage);
+var
+  Addr: Word;
+  Value: Integer;
+  X, Y: Integer;
+  Flag: Cardinal;
+  Q1: Byte;
+  Sc: Char;
+begin
+  Addr := Msg.WParam;
+  Value := Msg.LParam;
+
+  Y := (Addr div 40);
+  X := (Addr - Y*40);
+
+  Flag := (Value shr 7) and $FF;
+  Q1 := Value and $7F;
+  Sc := Char((Q1 + 32 * (ord(Q1 < 32) * 2 + ord(Q1 > 63) + ord(Q1 > 95))));
+
+  Canvas.Font.Color := ColorTable[1 - Flag];
+  Canvas.Brush.Color := ColorTable[Flag];
+  Canvas.TextOut(X * (8*ScreenZoom), Y * (8*ScreenZoom), Sc);
+end;
+
+end.

README.md

@@ -1 +1,27 @@
-# mos6502-delphi
+##MOS6502 Emulator in Delphi##
+
+This is the Delphi / Pascal port of the C++ implementation for the MOS Technology 6502 CPU by [Gianluca Ghettini](https://github.com/gianlucag/mos6502). The code is written to be more readable than fast, however some minor tricks have been introduced to greatly reduce the overall execution time.
+
+Main features:
+
+ * 100% coverage of legal opcodes
+ * decimal mode implemented
+ * read/write bus callback
+ * jump table opcode selection
+
+# mos6502-delphi
+
+The port was written with minor changes to the original file: the run(N) function was replaced by a single Step() function - if you need to run more than one cycle, just put that function inside a loop.
+
+# 6502 functional test
+
+The [6502 functional test](https://github.com/Klaus2m5/6502_65C02_functional_tests) (version 16-aug-2013) by Klaus Dormann is included.
+
+# C64 emulator
+
+A very basic C64 emulator is included. You need to download the BASIC ROM [basic.901226-01.bin](http://www.commodore.ca/manuals/funet/cbm/firmware/computers/c64/basic.901226-01.bin) and the Kernal ROM [kernal.901227-03.bin](http://www.commodore.ca/manuals/funet/cbm/firmware/computers/c64/kernal.901227-03.bin) and put both files inside the ROMs folder. Install the commodore [CBM.ttf](https://github.com/bobsummerwill/VICE/raw/master/data/fonts/CBM.ttf) font found in the VICE package.
+
+The C64 Emulator uses a symbolic keyboard translation thus any keyboard layout should work.
+
+This C64 emulator is just a a very basic 6502/6510 emulation example and is not feature complete. Please take a look at [VICE - Versatile Commodore Emulator](http://vice-emu.sourceforge.net/) instead.
+

Testsuite/Source/TestSuite.dpr

@@ -0,0 +1,116 @@
+program TestSuite;
+
+{$APPTYPE CONSOLE}
+
+{$R *.res}
+
+uses
+  System.Classes, System.SysUtils,
+  MOS6502 in '..\..\Source\MOS6502.pas';
+
+type
+  TMOS6502TestSuite = class(TMOS6502)
+  protected
+    procedure BusWrite(Adr: Word; Value: Byte);
+    function BusRead(Adr: Word): Byte;
+  public
+    Memory: PByte;
+    constructor Create;
+    destructor Destroy; override;
+    procedure RunTest(EndAddress: Word);
+    procedure Load(Filename: String);
+  end;
+
+{ TMOS6502TestSuite }
+
+function TMOS6502TestSuite.BusRead(Adr: Word): Byte;
+begin
+  Result := Memory[Adr];
+end;
+
+procedure TMOS6502TestSuite.BusWrite(Adr: Word; Value: Byte);
+begin
+  Memory[Adr] := Value;
+end;
+
+constructor TMOS6502TestSuite.Create;
+begin
+  inherited Create(BusRead, BusWrite);
+
+  // create memory
+  GetMem(Memory, 65536);
+end;
+
+destructor TMOS6502TestSuite.Destroy;
+begin
+  FreeMem(Memory);
+  inherited;
+end;
+
+
+procedure TMOS6502TestSuite.Load(Filename: String);
+var
+  Stream: TFileStream;
+begin
+  Stream := TFileStream.Create(Filename, fmOpenRead);
+  Stream.Read(Memory[0], Stream.Size);
+  Stream.Free;
+end;
+
+procedure TMOS6502TestSuite.RunTest(EndAddress: Word);
+var
+  LastPc: Word;
+  LastTest: Byte;
+begin
+  // reset (jump to $0400)
+  Reset;
+
+  LastTest := $FF;
+  repeat
+    LastPc := Pc;
+    if Memory[$200] <> LastTest then
+    begin
+      LastTest := Memory[$200];
+      Writeln('test case ' + LastTest.ToString + ' at $' +IntToHex(Pc, 4));
+    end;
+
+    // Run 1 instruction
+    Step;
+  until (IllegalOpcode) or (Pc = LastPC) or (Pc = EndAddress);
+
+  if Pc = EndAddress then
+    writeln('test successful')
+  else
+    writeln('failed at ' + IntToHex(Pc, 4));
+end;
+
+var
+  MOS6502: TMOS6502TestSuite;
+
+begin
+  try
+    MOS6502 := TMOS6502TestSuite.Create;
+    try
+      // load test bin
+      MOS6502.Load('..\Test-Files\6502_functional_test.bin');
+
+      // set reset vectors to $0400
+      MOS6502.Memory[$FFFC] := 0;
+      MOS6502.Memory[$FFFD] := 4;
+
+
+      // and run test suite, if PC reaches $3399 then test is successful
+      MOS6502.RunTest($3399);
+
+      Readln;
+
+    finally
+      MOS6502.Free;
+    end;
+
+  except
+    on E: Exception do
+      Writeln(E.ClassName, ': ', E.Message);
+  end;
+end.
+