diff --git a/mdl/m_io_stdio.pas b/mdl/m_io_stdio.pas
new file mode 100644
index 0000000..456da13
--- /dev/null
+++ b/mdl/m_io_stdio.pas
@@ -0,0 +1,157 @@
+Unit m_io_stdio;
+
+{$I M_OPS.PAS}
+
+Interface
+
+Uses
+  BaseUnix,
+  m_io_Base;
+
+Const
+  STDIO_IN  = 0;
+  STDIO_OUT = 1;
+
+Type
+  TSTDIO = Class(TIOBase)
+    Constructor Create;
+    Destructor  Destroy; Override;
+    Function    DataWaiting      : Boolean; Override;
+    Function    WriteBuf         (Var Buf; Len: LongInt) : LongInt; Override;
+    Function    ReadBuf          (Var Buf; Len: LongInt) : LongInt; Override;
+    Procedure   BufWriteChar     (Ch: Char); Override;
+    Procedure   BufWriteStr      (Str: String); Override;
+    Procedure   BufFlush;        Override;
+    Function    WriteLine        (Str: String) : LongInt; Override;
+    Function    ReadLine         (Var Str: String) : LongInt; Override;
+    Function    WaitForData      (TimeOut: LongInt) : LongInt; Override;
+    Function    PeekChar         (Num: Byte) : Char; Override;
+    Function    ReadChar         : Char; Override;
+  End;
+
+Implementation
+
+Constructor TSTDIO.Create;
+Begin
+  Inherited Create;
+
+  FInBufPos  := 0;
+  FInBufEnd  := 0;
+  FOutBufPos := 0;
+End;
+
+Destructor TSTDIO.Destroy;
+Begin
+  Inherited Destroy;
+End;
+
+Function TSTDIO.DataWaiting : Boolean;
+Begin
+  Result := (FInBufPos < FInBufEnd) or (WaitForData(0) > 0);
+End;
+
+Function TSTDIO.WriteBuf (Var Buf; Len: LongInt) : LongInt;
+Begin
+  Result := fpWrite(STDIO_OUT, Buf, Len);
+End;
+
+Procedure TSTDIO.BufFlush;
+Begin
+  If FOutBufPos > 0 Then Begin
+    fpWrite (STDIO_OUT, FOutBuf, FOutBufPos);
+
+    FOutBufPos := 0;
+  End;
+End;
+
+Procedure TSTDIO.BufWriteChar (Ch: Char);
+Begin
+  FOutBuf[FOutBufPos] := Ch;
+
+  Inc(FOutBufPos);
+
+  If FOutBufPos > TIOBufferSize Then
+    BufFlush;
+End;
+
+Procedure TSTDIO.BufWriteStr (Str: String);
+Var
+  Count : LongInt;
+Begin
+  For Count := 1 to Length(Str) Do
+    BufWriteChar(Str[Count]);
+End;
+
+Function TSTDIO.ReadChar : Char;
+Begin
+  ReadBuf(Result, 1);
+End;
+
+Function TSTDIO.PeekChar (Num: Byte) : Char;
+Begin
+  If (FInBufPos = FInBufEnd) and DataWaiting Then
+    ReadBuf(Result, 0);
+
+  If FInBufPos + Num < FInBufEnd Then
+    Result := FInBuf[FInBufPos + Num];
+End;
+
+Function TSTDIO.ReadBuf (Var Buf; Len: LongInt) : LongInt;
+Begin
+  If FInBufPos = FInBufEnd Then Begin
+    FInBufEnd := fpRead(STDIO_IN, @FInBuf, TIOBufferSize);
+    FInBufPos := 0;
+
+    If FInBufEnd <= 0 Then Begin
+      FInBufEnd := 0;
+      Result    := -1;
+      Exit;
+    End;
+  End;
+
+  If Len > FInBufEnd - FInBufPos Then Len := FInBufEnd - FInBufPos;
+
+  Move (FInBuf[FInBufPos], Buf, Len);
+  Inc  (FInBufPos, Len);
+
+  Result := Len;
+End;
+
+Function TSTDIO.ReadLine (Var Str: String) : LongInt;
+Var
+  Ch  : Char;
+  Res : LongInt;
+Begin
+  Str := '';
+  Res := 0;
+
+  Repeat
+    If FInBufPos = FInBufEnd Then Res := ReadBuf(Ch, 0);
+
+    Ch := FInBuf[FInBufPos];
+
+    Inc (FInBufPos);
+
+    If (Ch <> #10) And (Ch <> #13) And (FInBufEnd > 0) Then Str := Str + Ch;
+  Until (Ch = #10) Or (Res < 0) Or (FInBufEnd = 0);
+
+  If Res < 0 Then Result := -1 Else Result := Length(Str);
+End;
+
+Function TSTDIO.WriteLine (Str: String) : LongInt;
+Begin
+  Str    := Str + #13#10;
+  Result := fpWrite(STDIO_OUT, Str[1], Length(Str));
+End;
+
+Function TSTDIO.WaitForData (TimeOut: LongInt) : LongInt;
+Var
+  FDSIN : TFDSET;
+Begin
+  fpFD_Zero (FDSIN);
+  fpFD_Set  (STDIO_IN, FDSIN);
+
+  Result := fpSelect (STDIO_IN + 1, @FDSIN, NIL, NIL, TimeOut);
+End;
+
+End.