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diff --git a/c/src/lib/libbsp/i386/force386/timer/timerisr.s b/c/src/lib/libbsp/i386/force386/timer/timerisr.s
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+/* timer_isr()
+ *
+ * This routine provides the ISR for the Z8036 timer on the MVME136
+ * board. The timer is set up to generate an interrupt at maximum
+ * intervals.
+ *
+ * Input parameters: NONE
+ *
+ * Output parameters: NONE
+ *
+ * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
+ * On-Line Applications Research Corporation (OAR).
+ * All rights assigned to U.S. Government, 1994.
+ *
+ * This material may be reproduced by or for the U.S. Government pursuant
+ * to the copyright license under the clause at DFARS 252.227-7013. This
+ * notice must appear in all copies of this file and its derivatives.
+ *
+ * $Id$
+ */
+
+#include "asm.h"
+
+ BEGIN_CODE
+
+ EXTERN (Ttimer_val)
+
+ PUBLIC (timerisr)
+SYM (timerisr):
+ addl $250, SYM (Ttimer_val) # another 250 microseconds
+ iret
+
+END_CODE
+END