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diff --git a/bsps/i386/pc386/btimer/timerisr.S b/bsps/i386/pc386/btimer/timerisr.S
new file mode 100644
index 0000000000..da2a07845a
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+++ b/bsps/i386/pc386/btimer/timerisr.S
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+/*-------------------------------------------------------------------------+
+| timerisr.s v1.1 - PC386 BSP - 1997/08/07
++--------------------------------------------------------------------------+
+| This file contains the PC386 timer interrupt handler.
++--------------------------------------------------------------------------+
+| (C) Copyright 1997 -
+| - NavIST Group - Real-Time Distributed Systems and Industrial Automation
+|
+| http://pandora.ist.utl.pt
+|
+| Instituto Superior Tecnico * Lisboa * PORTUGAL
++--------------------------------------------------------------------------+
+| Disclaimer:
+|
+| This file is provided "AS IS" without warranty of any kind, either
+| expressed or implied.
++--------------------------------------------------------------------------+
+| This code is base on:
+|   timerisr.s,v 1.5 1995/12/19 20:07:45 joel Exp - go32 BSP
+| With the following copyright notice:
+| **************************************************************************
+| *  COPYRIGHT (c) 1989-1999.
+| *  On-Line Applications Research Corporation (OAR).
+| *
+| *  The license and distribution terms for this file may be
+| *  found in the file LICENSE in this distribution or at
+| *  http://www.rtems.org/license/LICENSE.
+| **************************************************************************
++--------------------------------------------------------------------------*/
+
+#include <rtems/asm.h>
+
+BEGIN_CODE
+
+	EXTERN(Ttimer_val)
+
+/*-------------------------------------------------------------------------+
+|         Function: rtems_isr timerisr(rtems_vector_number);
+|      Description: ISR for the timer. The timer is set up to generate an
+|                   interrupt at maximum intervals.
+| Global Variables: None.
+|        Arguments: standard - see RTEMS documentation.
+|          Returns: standard return value - see RTEMS documentation.
++--------------------------------------------------------------------------*/
+	PUBLIC(timerisr)
+SYM (timerisr):
+	incl	Ttimer_val	# another tick
+	pushl	eax
+	movb	$0x20, al
+	outb	al, $0x20	# signal generic End Of Interrupt (EOI) to PIC
+	popl	eax
+	iret
+
+END_CODE
+
+END