diff --git a/mdl/m_protocol_base.pas b/mdl/m_protocol_base.pas
index e11b7f8..0f4c264 100644
--- a/mdl/m_protocol_base.pas
+++ b/mdl/m_protocol_base.pas
@@ -36,6 +36,8 @@ Type
     Queue       : TProtocolQueue;
     EndTransfer : Boolean;
     Connected   : Boolean;
+    StatusCheck : Word;
+    StatusTimer : LongInt;
     ReceivePath : String;
 
     Constructor Create (Var C: TSocketClass; Var Q: TProtocolQueue); Virtual;
@@ -44,6 +46,9 @@ Type
     Function    AbortTransfer   : Boolean;
     Procedure   StatusUpdate    (Starting, Ending: Boolean);
     Function    ReadByteTimeOut (hSec: LongInt) : SmallInt;
+
+    Procedure   QueueReceive; Virtual;
+    Procedure   QueueSend; Virtual;
   End;
 
 Implementation
@@ -62,6 +67,8 @@ Begin
   ReceivePath := '';
   StatusProc  := NIL;
   AbortProc   := @NoAbortProc;
+  StatusCheck := 100;
+  StatusTimer := 0;
 
   FillChar(Status, SizeOf(Status), 0);
 End;
@@ -84,10 +91,10 @@ Begin
   Result := -1;
 
   If Client.DataWaiting Then Begin
-    Connected := Client.ReadBuf(Res, 1) <> -1;
+    Connected := Client.ReadBuf(Res, 1) >= 0;
     Result    := Res;
   End Else
-    Case Client.WaitForData(HSec * 10) of
+    Case Client.WaitForData(hSec * 10) of
       -1 : Connected := False;
       0  : ;
     Else
@@ -104,4 +111,12 @@ Begin
   AbortTransfer := EndTransfer;
 End;
 
+Procedure TProtocolBase.QueueReceive;
+Begin
+End;
+
+Procedure TProtocolBase.QueueSend;
+Begin
+End;
+
 End.
diff --git a/mdl/m_protocol_queue.pas b/mdl/m_protocol_queue.pas
index 14afa18..a1d5e65 100644
--- a/mdl/m_protocol_queue.pas
+++ b/mdl/m_protocol_queue.pas
@@ -72,6 +72,7 @@ Begin
   Assign (F, fPath + fName);
 
   {$I-} Reset(F, 1); {$I+}
+
   If IoResult = 0 Then Begin
     QData[QSize]^.FileSize := FileSize(F);
     QData[QSize]^.Status   := QueuePending;
diff --git a/mdl/m_protocol_xmodem.pas b/mdl/m_protocol_xmodem.pas
index f9121ec..a5737b7 100644
--- a/mdl/m_protocol_xmodem.pas
+++ b/mdl/m_protocol_xmodem.pas
@@ -5,12 +5,32 @@ Unit m_Protocol_XModem;
 Interface
 
 Uses
-  m_Protocol_Base;
+  m_Socket_Class,
+  m_Protocol_Base,
+  m_Protocol_Queue;
 
 Type
   TProtocolXmodem = Class(TProtocolBase)
+    DoCRC : Boolean;
+    Do1K  : Boolean;
+
+    Constructor Create (Var C: TSocketClass; Var Q: TProtocolQueue); Override;
+    Destructor  Destroy; Override;
   End;
 
 Implementation
 
-End.
\ No newline at end of file
+Constructor TProtocolXmodem.Create (Var C: TSocketClass; Var Q: TProtocolQueue);
+Begin
+  Inherited Create(C, Q);
+
+  DoCRC := True;
+  Do1K  := True;
+End;
+
+Destructor TProtocolXmodem.Destroy;
+Begin
+  Inherited Destroy;
+End;
+
+End.
diff --git a/mdl/m_protocol_ymodem.pas b/mdl/m_protocol_ymodem.pas
index bba56dd..1a744e0 100644
--- a/mdl/m_protocol_ymodem.pas
+++ b/mdl/m_protocol_ymodem.pas
@@ -5,12 +5,30 @@ Unit m_Protocol_YModem;
 Interface
 
 Uses
+  m_Socket_Class,
+  m_Protocol_Queue,
   m_Protocol_Xmodem;
 
 Type
   TProtocolYmodem = Class(TProtocolXmodem)
+    UseG : Boolean;
+
+    Constructor Create (Var C: TSocketClass; Var Q: TProtocolQueue); Override;
+    Destructor  Destroy; Override;
   End;
 
 Implementation
 
+Constructor TProtocolYModem.Create (Var C: TSocketClass; Var Q: TProtocolQueue);
+Begin
+  Inherited Create(C, Q);
+
+  UseG := False;
+End;
+
+Destructor TProtocolYModem.Destroy;
+Begin
+  Inherited Destroy;
+End;
+
 End.
\ No newline at end of file
diff --git a/mdl/m_protocol_zmodem.pas b/mdl/m_protocol_zmodem.pas
index 875ca29..4a6261d 100644
--- a/mdl/m_protocol_zmodem.pas
+++ b/mdl/m_protocol_zmodem.pas
@@ -2,7 +2,7 @@ Unit m_Protocol_Zmodem;
 
 {$I M_OPS.PAS}
 
-{.$DEFINE ZDEBUG}
+{$DEFINE ZDEBUG}
 
 Interface
 
@@ -21,8 +21,6 @@ Const
   ZBufSize    = 1024;  // 1024 only maybe 8k ZEDZAP someday
   ZAttnLen    = 32;
   RxTimeOut   : Word = 500;
-  StatusCheck : Word = 50;
-  StatusTimer : LongInt = 0;
 
 Type
   ZHdrType = Array[0..3] of Byte;
@@ -49,8 +47,9 @@ Type
     Constructor Create (Var C: TSocketClass; Var Q: TProtocolQueue); Override;
     Destructor  Destroy; Override;
 
-    Procedure   QueueReceive; Virtual;
-    Procedure   QueueSend; Virtual;
+    Procedure   QueueReceive; Override;
+    Procedure   QueueSend; Override;
+
     Function    ZInitReceiver        : SmallInt;
     Function    ZGetByte             : SmallInt;
     Function    ZDLRead              : SmallInt;
@@ -80,6 +79,7 @@ Implementation
 Const
   CANBRK     = 4;
   EscAll     = $0040;
+  ZCRC       = 13;
   ZABORT     = 7;
   ZRQINIT    = 0;
   ZPAD       = 42;
@@ -843,7 +843,7 @@ Var
 Begin
   {$IFDEF ZDEBUG} ZLog(''); {$ENDIF}
   {$IFDEF ZDEBUG} ZLog('ZSendFile -> begin'); {$ENDIF}
-  {$IFDEF ZDEBUG} ZLog('ZSendFile -> file:' + Queue^.QData[Queue^.QPos]^.FName); {$ENDIF}
+  {$IFDEF ZDEBUG} ZLog('ZSendFile -> file:' + Queue.QData[Queue.QPos].FileName); {$ENDIF}
 
   Result := ZERROR;
 
@@ -897,14 +897,22 @@ Begin
         ZFIN,
         ZTIMEOUT  : Begin
                       Close (WrkFile);
+
                       Exit;
                     End;
         ZSKIP     : Begin
                       Close (WrkFile);
                       ZSendFile := ZSKIP;
+
                       Exit;
                     End;
-        ZRPOS     : Goto start;
+        ZCRC :      Begin
+                      ZPutLong(FileCRC32(Status.FilePath + Status.FileName));
+                      ZSendHexHeader(ZCRC);
+
+                      Continue;
+                    End;
+        ZRPOS     : Goto Start;
       End;
     Until (C <> ZRINIT);
   Until False;
@@ -1118,7 +1126,7 @@ Begin
 
     FillChar (TxHdr, SizeOf(TxHdr), 0); // zero out all flags
 
-    TxHdr[ZF0] := CANFDX OR CANOVIO OR CANFC32 {OR CANBRK};
+    TxHdr[ZF0] := CANFDX OR CANOVIO OR CANFC32 OR CANBRK;
 
     If EscapeAll Then
       TxHdr[ZF0] := TxHdr[ZF0] or ESCALL;
@@ -1673,4 +1681,4 @@ Begin
   StatusUpdate(False, True);
 End;
 
-End.
+End.
\ No newline at end of file