diff --git a/sys/alpha/isa/mcclock_isa.c b/sys/alpha/isa/mcclock_isa.c
new file mode 100644
index 000000000000..34b9a90031fe
--- /dev/null
+++ b/sys/alpha/isa/mcclock_isa.c
@@ -0,0 +1,105 @@
+/* $Id$ */
+/* $NetBSD: mcclock_tlsb.c,v 1.8 1998/05/13 02:50:29 thorpej Exp $ */
+
+/*
+ * Copyright (c) 1997 by Matthew Jacob
+ * NASA AMES Research Center.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice immediately at the beginning of the file, without modification,
+ *    this list of conditions, and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/systm.h>
+#include <sys/module.h>
+#include <sys/bus.h>
+
+#include <machine/clockvar.h>
+#include <dev/dec/mcclockvar.h>
+
+#include <dev/dec/mc146818reg.h>
+
+static int	mcclock_isa_probe(device_t dev);
+static int	mcclock_isa_attach(device_t dev);
+static void	mcclock_isa_write(device_t, u_int, u_int);
+static u_int	mcclock_isa_read(device_t, u_int);
+
+static device_method_t mcclock_isa_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,		mcclock_isa_probe),
+	DEVMETHOD(device_attach,	mcclock_isa_attach),
+
+	/* mcclock interface */
+	DEVMETHOD(mcclock_write,	mcclock_isa_write),
+	DEVMETHOD(mcclock_read,		mcclock_isa_read),
+
+	/* clock interface */
+	DEVMETHOD(clock_init,		mcclock_init),
+	DEVMETHOD(clock_get,		mcclock_get),
+	DEVMETHOD(clock_set,		mcclock_set),
+
+	{ 0, 0 }
+};
+
+static driver_t mcclock_isa_driver = {
+	"mcclock",
+	mcclock_isa_methods,
+	DRIVER_TYPE_MISC,
+	1,			/* XXX no softc */
+};
+
+static devclass_t mcclock_devclass;
+
+int
+mcclock_isa_probe(device_t dev)
+{
+	device_set_desc(dev, "MC146818A real time clock");
+	return 0;
+}
+
+int
+mcclock_isa_attach(device_t dev)
+{
+	mcclock_attach(dev);
+	return 0;
+}
+
+static void
+mcclock_isa_write(device_t dev, u_int reg, u_int val)
+{
+	outb(0x70, reg);
+	outb(0x71, val);
+}
+
+static u_int
+mcclock_isa_read(device_t dev, u_int reg)
+{
+	outb(0x70, reg);
+	return inb(0x71);
+}
+
+/* XXX put it on the root for now, later on isa */
+DRIVER_MODULE(mcclock_isa, root, mcclock_isa_driver, mcclock_devclass, 0, 0);