Initial VIC-20 emulator based on C64 source
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README.md
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README.md
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##MOS6502 Emulator in Delphi##
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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.
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Main features:
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* 100% coverage of legal opcodes
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* decimal mode implemented
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* read/write bus callback
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* jump table opcode selection
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# mos6502-delphi
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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.
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# 6502 functional test
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The [6502 functional test](https://github.com/Klaus2m5/6502_65C02_functional_tests) (version 16-aug-2013) by Klaus Dormann is included.
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# C64 emulator
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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.
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The C64 Emulator uses a symbolic keyboard translation thus any keyboard layout should work.
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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.
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##MOS6502 Emulator in Delphi##
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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.
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Main features:
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* 100% coverage of legal opcodes
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* decimal mode implemented
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* read/write bus callback
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* jump table opcode selection
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# mos6502-delphi
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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.
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# 6502 functional test
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The [6502 functional test](https://github.com/Klaus2m5/6502_65C02_functional_tests) (version 16-aug-2013) by Klaus Dormann is included.
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# C64 emulator
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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.
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The C64 Emulator uses a symbolic keyboard translation thus any keyboard layout should work.
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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.
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# VIC-20 emulator
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Based on the C64 emulator, a VIC-20 emulator is now included. You need to download the BASIC ROM [basic.901486-01.bin](http://www.commodore.ca/manuals/funet/cbm/firmware/computers/vic20/basic.901486-01.bin) and the Kernal ROM [kernal.901486-07.bin](http://www.commodore.ca/manuals/funet/cbm/firmware/computers/vic20/kernal.901486-07.bin) and put both files inside the ROMs folder. Changes compared to the C64 source are Addr and Keyboard matrix.
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Put your BASIC and Kernal ROMs here
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object FrmVC20: TFrmVC20
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Left = 0
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Top = 0
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BorderStyle = bsDialog
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Caption = 'VIC-20 Emu'
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ClientHeight = 393
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ClientWidth = 645
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Color = clBtnFace
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Font.Charset = DEFAULT_CHARSET
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Font.Color = clWindowText
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Font.Height = -11
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Font.Name = 'Tahoma'
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Font.Style = []
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KeyPreview = True
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OldCreateOrder = False
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Position = poScreenCenter
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OnCreate = FormCreate
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OnDestroy = FormDestroy
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OnKeyPress = FormKeyPress
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OnKeyUp = FormKeyUp
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PixelsPerInch = 96
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TextHeight = 13
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end
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unit FormV20;
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interface
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uses
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Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
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Vcl.Controls, Vcl.Forms, Vcl.Dialogs, VIC20, Vcl.StdCtrls, Vcl.ExtCtrls;
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const
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ScreenZoom = 2;
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ScreenWidth = 176 * ScreenZoom; // 320
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ScreenHeight = 184 * ScreenZoom; // 200
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ColorTable: array [0 .. 2] of Cardinal = ($801010, $D0A0A0, $D0A0A0);
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type
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TFrmVC20 = class(TForm)
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procedure FormCreate(Sender: TObject);
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procedure FormKeyUp(Sender: TObject; var Key: Word; Shift: TShiftState);
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procedure FormKeyPress(Sender: TObject; var Key: Char);
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procedure FormDestroy(Sender: TObject);
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private
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{ Private declarations }
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procedure OnScreenWrite(var Msg: TMessage); message WM_SCREEN_WRITE;
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public
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{ Public declarations }
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LastKey: Char;
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VC20: TVC20;
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end;
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var
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FrmVC20: TFrmVC20;
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implementation
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{$R *.dfm}
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procedure TFrmVC20.FormCreate(Sender: TObject);
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begin
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ClientWidth := ScreenWidth;
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ClientHeight := ScreenHeight;
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Canvas.Font.Name := 'cbm';
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Canvas.Font.Height := 8 * ScreenZoom;
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Canvas.Brush.Style := bsSolid;
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VC20 := TVC20.Create;
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VC20.WndHandle := Handle;
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VC20.LoadROM('..\ROMs\kernal.901486-06.bin', $E000); // E000-FFFF
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VC20.LoadROM('..\ROMs\basic.901486-01.bin', $C000); // C000-DFFF
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VC20.Exec;
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end;
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procedure TFrmVC20.FormDestroy(Sender: TObject);
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begin
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VC20.Free;
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end;
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procedure TFrmVC20.FormKeyPress(Sender: TObject; var Key: Char);
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begin
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VC20.SetKey(Key, 1);
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LastKey := Key;
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end;
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procedure TFrmVC20.FormKeyUp(Sender: TObject; var Key: Word; Shift: TShiftState);
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begin
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if LastKey <> #0 then
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VC20.SetKey(LastKey, 0);
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LastKey := #0;
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end;
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procedure TFrmVC20.OnScreenWrite(var Msg: TMessage);
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var
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Addr: Word;
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Value: Integer;
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X, Y: Integer;
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Flag: Cardinal;
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Q1: Byte;
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Sc: Char;
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begin
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Addr := Msg.WParam;
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Value := Msg.LParam;
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Y := (Addr div 22); //40
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X := (Addr - Y*22); //40
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Flag := (Value shr 7) and $FF;
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Q1 := Value and $7F;
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Sc := Char((Q1 + 32 * (ord(Q1 < 32) * 2 + ord(Q1 > 63) + ord(Q1 > 95))));
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Canvas.Font.Color := ColorTable[1 - Flag];
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Canvas.Brush.Color := ColorTable[Flag];
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Canvas.TextOut(X * (8*ScreenZoom), Y * (8*ScreenZoom), Sc);
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end;
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end.
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unit VIC20;
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interface
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uses
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System.Classes, WinApi.Messages, MOS6502;
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const
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WM_SCREEN_WRITE = WM_USER + 0;
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CIA1 = $9120; // $DC00;
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// VIC-20 keyboard matrix
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KEY_TRANSLATION = '2q'#0' '#27#0#0'1'+
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'4esz'#0'aw3'+
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'6tfcxdr5'+
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'8uhbvgy7'+
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'0okmnji9'+
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'-@:.,lp+'+
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#0#0'='#0'/;*£'+
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#0#0#0#0#0#0#13#8+
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'"'#0#0#0#0#0#0'!'+
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'$'#0#0#0#0#0#0'#'+
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'&'#0#0#0#0#0#0'%'+
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'('#0#0#0#0#0#0''''+
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'0'#0#0#0#0#0#0')'+
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'_'#0'[><l'#0#0+
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#0#0'='#0'?]'#0#0+
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#0#0#0#0#0#0#13#8;
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type
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TVC20 = class;
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TVC20Thread = class(TThread)
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private
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VC20: TVC20;
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protected
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public
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procedure Execute; override;
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constructor Create(VC20Instance: TVC20);
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end;
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TVC20 = class(TMOS6502)
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private
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Thread: TVC20Thread;
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TimerHandle: Integer;
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LastKey: Char;
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procedure BusWrite(Adr: Word; Value: Byte);
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function BusRead(Adr: Word): Byte;
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function KeyRead: Byte;
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protected
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KeyMatrix: Array[0 .. 7, 0 .. 7] of Byte;
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Memory: PByte;
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InterruptRequest: Boolean;
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public
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WndHandle: THandle;
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constructor Create;
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destructor Destroy; override;
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procedure LoadROM(Filename: String; Addr: Word);
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procedure Exec;
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procedure SetKey(Key: Char; Value: Byte);
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end;
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implementation
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uses
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System.SysUtils, Winapi.Windows, WinApi.MMSystem;
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{ TVC20 }
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procedure TimerProcedure(TimerID, Msg: Uint; dwUser, dw1, dw2: DWORD); pascal;
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var
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VC20: TVC20;
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begin
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VC20 := TVC20(dwUser);
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if VC20.Status and VC20.INTERRUPT = 0 then // if IRQ allowed then set irq
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VC20.InterruptRequest := True;
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end;
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function TVC20.BusRead(Adr: Word): Byte;
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begin
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Result := Memory[Adr];
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end;
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procedure TVC20.BusWrite(Adr: Word; Value: Byte);
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begin
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// test for I/O requests
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case Adr of
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CIA1:
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begin
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// Handle keyboard reading
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Memory[Adr] := Value;
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Memory[CIA1 + 1] := KeyRead;
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end;
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CIA1 + 5: // Timer
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if TimerHandle = 0 then
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TimerHandle := TimeSetEvent(34, 2, @TimerProcedure, DWORD(Self), TIME_PERIODIC);
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end;
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if (Adr >= $2000) then // $A000 // treat anything above as ROM
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Exit;
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Memory[Adr] := Value;
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// video RAM
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if (Adr >= $1E00) and (Adr <= $1FF9) then // $400 - $07E7
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PostMessage(WndHandle, WM_SCREEN_WRITE, Adr - $1E00, Value); // $400
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end;
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constructor TVC20.Create;
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begin
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inherited Create(BusRead, BusWrite);
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// create 64kB memory table
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GetMem(Memory, 65536);
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Thread := TVC20Thread.Create(Self);
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end;
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destructor TVC20.Destroy;
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begin
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if TimerHandle <> 0 then
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Timekillevent(TimerHandle);
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Thread.Terminate;
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Thread.WaitFor;
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FreeMem(Memory);
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inherited;
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end;
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procedure TVC20.Exec;
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begin
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Reset;
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Thread.Start;
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end;
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function TVC20.KeyRead: Byte;
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var
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Row, Col, Cols: Byte;
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begin
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Result := 0;
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Cols := Memory[CIA1];
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for Col := 0 to 7 do
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if Cols and (1 shl Col) = 0 then // a 0 indicates a column read
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for Row := 0 to 7 do
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if KeyMatrix[7 - Col, Row] = 1 then
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Result := Result + (1 shl Row);
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Result := not Result;
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end;
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procedure TVC20.LoadROM(Filename: String; Addr: Word);
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var
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Stream: TFileStream;
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begin
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Stream := TFileStream.Create(Filename, fmOpenRead);
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try
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Stream.Read(Memory[Addr], Stream.Size);
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finally
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Stream.Free;
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end;
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end;
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procedure TVC20.SetKey(Key: Char; Value: Byte);
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var
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KeyPos: Integer;
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begin
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KeyPos := Pos(Key, KEY_TRANSLATION) - 1;
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if KeyPos >= 0 then
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begin
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// always release last key on keypress
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if Value = 1 then
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begin
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SetKey(LastKey, 0);
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LastKey := Key;
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end;
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if KeyPos > 63 then // set right shift on/off
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begin
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KeyMatrix[3, 6] := Value; // 1, 4
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Dec(KeyPos, 64);
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end;
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KeyMatrix[KeyPos mod 8, KeyPos div 8] := Value;
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end;
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end;
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{ TVC20Thread }
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constructor TVC20Thread.Create(VC20Instance: TVC20);
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begin
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inherited Create(True);
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VC20 := VC20Instance;
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end;
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procedure TVC20Thread.Execute;
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begin
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while (not Terminated) do
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begin
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if VC20.InterruptRequest then
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begin
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VC20.InterruptRequest := False;
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VC20.IRQ;
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end;
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VC20.Step;
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Sleep(0);
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end;
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end;
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end.
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program VIC20Emu;
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uses
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Vcl.Forms,
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FormV20 in 'FormV20.pas' {FrmVC20},
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VIC20 in 'VIC20.pas',
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MOS6502 in '..\..\Source\MOS6502.pas';
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{$R *.res}
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begin
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Application.Initialize;
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Application.MainFormOnTaskbar := True;
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Application.CreateForm(TFrmVC20, FrmVC20);
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Application.Run;
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end.
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