Código Delphi [-]
Form1.Width := Screen.Width;
Form1.Height := Screen.Height;

Código Delphi [-]
program MuchOjO;
 
uses Windows;
 
function SetConsoleDisplayMode(hConsoleOutput, dwFlags: Cardinal; lpNewScreenBufferDimensions: PCOORD): LongBool; stdcall external 'kernel32';
function GetConsoleWindow: Cardinal; stdcall external 'kernel32';
 
var hOutput: Cardinal;
begin
 AllocConsole;
 SetForegroundWindow(GetConsoleWindow);
 hOutput := GetStdHandle(STD_OUTPUT_HANDLE);
 SetConsoleDisplayMode(hOutput, 1{CONSOLE_FULLSCREEN_MODE}, nil);
 
 WriteLn('Sper0 k no c-a pa mal !');
 ReadLn;
end.

Código Delphi [-]
program Project2;
 
{$apptype console}
 
uses Windows;
 
begin
 keybd_event(VK_MENU, 0, 0, 0);
 keybd_event(VK_RETURN, $1C, 0, 0);
 keybd_event(VK_RETURN, $1C, KEYEVENTF_KEYUP, 0);
 keybd_event(VK_MENU, 0, KEYEVENTF_KEYUP, 0);
 WriteLn('Solved with a Cruft!');
 ReadLn;
end.

Código Delphi [-]
program Project1;

{$APPTYPE CONSOLE}

uses
  Windows,
  Messages,
  SysUtils;

{
   There is no documented way to make a console application fullscreen.
   The following code works for both NT and Win9x.
   For win NT I used the undocumented SetConsoleDisplayMode and
   GetConsoleDisplayMode functions.
}


{
   Es gibt dokumentierte Möglichkeit, eine Konsolen-Anwendung per Code
   in den Vollbild Modus zu setzen.
   Folgender Code funktioniert unter NT und Win9x.
   Unter NT werden die undokumentierten SetConsoleDisplayMode und
   GetConsoleDisplayMode Funktion verwendet.
}

{
 function GetConsoleDisplayMode(var lpdwMode: DWORD): BOOL; stdcall;
   external 'kernel32.dll';
  // lpdwMode: address of variable for current value of display mode
}

function NT_GetConsoleDisplayMode(var lpdwMode: DWORD): Boolean;
type
  TGetConsoleDisplayMode = function(var lpdwMode: DWORD): BOOL;
  stdcall;
var
  hKernel: THandle;
  GetConsoleDisplayMode: TGetConsoleDisplayMode;
begin
  Result := False;
  hKernel := GetModuleHandle('kernel32.dll');
  if (hKernel > 0) then
  begin @GetConsoleDisplayMode :=
      GetProcAddress(hKernel, 'GetConsoleDisplayMode');
    if Assigned(GetConsoleDisplayMode) then
    begin
      Result := GetConsoleDisplayMode(lpdwMode);
    end;
  end;
end;

{
  function SetConsoleDisplayMode(hOut: THandle; // standard output handle
  dwNewMode: DWORD;         // specifies the display mode
  var lpdwOldMode: DWORD    // address of variable for previous value of display mode
  ): BOOL; stdcall; external 'kernel32.dll';
}

function NT_SetConsoleDisplayMode(hOut: THandle; dwNewMode: DWORD;
  var lpdwOldMode: DWORD): Boolean;
type
  TSetConsoleDisplayMode = function(hOut: THandle; dwNewMode: DWORD;
  var lpdwOldMode: DWORD): BOOL;
  stdcall;
var
  hKernel: THandle;
  SetConsoleDisplayMode: TSetConsoleDisplayMode;
begin
  Result := False;
  hKernel := GetModuleHandle('kernel32.dll');
  if (hKernel > 0) then
  begin @SetConsoleDisplayMode :=
      GetProcAddress(hKernel, 'SetConsoleDisplayMode');
    if Assigned(SetConsoleDisplayMode) then
    begin
      Result := SetConsoleDisplayMode(hOut, dwNewMode, lpdwOldMode);
    end;
  end;
end;

function GetConsoleWindow: THandle;
var
  S: AnsiString;
  C: Char;
begin
  Result := 0;
  Setlength(S, MAX_PATH + 1);
  if GetConsoleTitle(PChar(S), MAX_PATH) <> 0 then
  begin
    C := S[1];
    S[1] := '$';
    SetConsoleTitle(PChar(S));
    Result := FindWindow(nil, PChar(S));
    S[1] := C;
    SetConsoleTitle(PChar(S));
  end;
end;

function SetConsoleFullScreen(bFullScreen: Boolean): Boolean;
const
  MAGIC_CONSOLE_TOGGLE = 57359;
var
  dwOldMode: DWORD;
  dwNewMode: DWORD;
  hOut: THandle;
  hConsole: THandle;
begin
  if Win32Platform = VER_PLATFORM_WIN32_NT then
  begin
    dwNewMode := Ord(bFullScreen);
    NT_GetConsoleDisplayMode(dwOldMode);
    hOut := GetStdHandle(STD_OUTPUT_HANDLE);
    Result := NT_SetConsoleDisplayMode(hOut, dwNewMode, dwOldMode);
  end
  else
  begin
    hConsole := GetConsoleWindow;
    Result := hConsole <> 0;
    if Result then
    begin
      if bFullScreen then
      begin
        SendMessage(GetConsoleWindow, WM_COMMAND, MAGIC_CONSOLE_TOGGLE, 0);
      end
      else
      begin
        // Better solution than keybd_event under Win9X ?
        keybd_event(VK_MENU, MapVirtualKey(VK_MENU, 0), 0, 0);
        keybd_event(VK_RETURN, MapVirtualKey(VK_RETURN, 0), 0, 0);
        keybd_event(VK_RETURN, MapVirtualKey(VK_RETURN, 0), KEYEVENTF_KEYUP, 0);
        keybd_event(VK_MENU, MapVirtualKey(VK_MENU, 0), KEYEVENTF_KEYUP, 0);
      end;
    end;
  end;
end;

begin

  SetConsoleFullScreen(true);
  Readln;
  SetConsoleFullScreen(false);

end.