diff --git a/mdl/m_input_crt.pas b/mdl/m_input_crt.pas
new file mode 100644
index 0000000..aac6866
--- /dev/null
+++ b/mdl/m_input_crt.pas
@@ -0,0 +1,71 @@
+{$I M_OPS.PAS}
+
+Unit m_Input_CRT;
+
+// This is a generic implementation of the Input class which relies on the
+// FPC CRT unit.  This is not really suitable to use but it can sometimes
+// be useful when beginning to port an MDL application to a new operating
+// system.  The CRT based I/O implementions not only rely on a usable CRT
+// implementation for that platform, but also are very inefficient.  They
+// should NOT be used.
+
+Interface
+
+Type
+  TInputCRT = Class
+
+    Constructor Create;
+    Destructor  Destroy; Override;
+
+    Function    ProcessQueue : Boolean;
+    Function    KeyWait (MS: LongInt) : Boolean;
+    Function    KeyPressed : Boolean;
+    Function    ReadKey : Char;
+  End;
+
+Implementation
+
+Uses
+  CRT;
+
+Constructor TInputCRT.Create;
+Begin
+  Inherited Create;
+End;
+
+Destructor TInputCRT.Destroy;
+Begin
+  Inherited Destroy;
+End;
+
+Function TInputCRT.ProcessQueue : Boolean;
+Begin
+  Result := CRT.KeyPressed;
+End;
+
+Function TInputCRT.KeyWait (MS: LongInt) : Boolean;
+Var
+  WaitTimer : LongInt = 0;
+Begin
+  Result := CRT.KeyPressed;
+
+  While Not Result And (WaitTimer < MS) Do Begin
+    CRT.Delay (20);
+
+    Inc (WaitTimer, 20);
+
+    Result := KeyPressed;
+  End;
+End;
+
+Function TInputCRT.ReadKey : Char;
+Begin
+  Result := CRT.ReadKey;
+End;
+
+Function TInputCRT.KeyPressed : Boolean;
+Begin
+  Result := CRT.KeyPressed;
+End;
+
+End.