diff --git a/sys/dev/isa/ast.c b/sys/dev/isa/ast.c
index a7df838b24dc..8aa9705406a7 100644
--- a/sys/dev/isa/ast.c
+++ b/sys/dev/isa/ast.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: ast.c,v 1.36 1997/08/23 14:06:17 drochner Exp $	*/
+/*	$NetBSD: ast.c,v 1.37 1997/09/12 13:31:10 drochner Exp $	*/
 
 /*
  * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
@@ -147,15 +147,18 @@ astattach(parent, self, aux)
 	struct isa_attach_args *ia = aux;
 	struct commulti_attach_args ca;
 	bus_space_tag_t iot = ia->ia_iot;
-	int i;
+	int i, iobase;
 
 	sc->sc_iot = ia->ia_iot;
 	sc->sc_iobase = ia->ia_iobase;
 
-	for (i = 0; i < NSLAVES; i++)
-		if (bus_space_map(iot, sc->sc_iobase + i * COM_NPORTS,
-		    COM_NPORTS, 0, &sc->sc_slaveioh[i]))
+	for (i = 0; i < NSLAVES; i++) {
+		iobase = sc->sc_iobase + i * COM_NPORTS;
+		if (!com_is_console(iot, iobase, &sc->sc_slaveioh[i]) &&
+		    bus_space_map(iot, iobase, COM_NPORTS, 0,
+			&sc->sc_slaveioh[i]))
 			panic("astattach: couldn't map slave %d", i);
+	}
 
 	/*
 	 * Enable the master interrupt.
diff --git a/sys/dev/isa/boca.c b/sys/dev/isa/boca.c
index 80b923820724..8a10ef14dd51 100644
--- a/sys/dev/isa/boca.c
+++ b/sys/dev/isa/boca.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: boca.c,v 1.23 1997/08/23 14:06:18 drochner Exp $	*/
+/*	$NetBSD: boca.c,v 1.24 1997/09/12 13:31:11 drochner Exp $	*/
 
 /*
  * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
@@ -147,15 +147,18 @@ bocaattach(parent, self, aux)
 	struct isa_attach_args *ia = aux;
 	struct commulti_attach_args ca;
 	bus_space_tag_t iot = ia->ia_iot;
-	int i;
+	int i, iobase;
 
 	sc->sc_iot = ia->ia_iot;
 	sc->sc_iobase = ia->ia_iobase;
 
-	for (i = 0; i < NSLAVES; i++)
-		if (bus_space_map(iot, sc->sc_iobase + i * COM_NPORTS,
-		    COM_NPORTS, 0, &sc->sc_slaveioh[i]))
+	for (i = 0; i < NSLAVES; i++) {
+		iobase = sc->sc_iobase + i * COM_NPORTS;
+		if (!com_is_console(iot, iobase, &sc->sc_slaveioh[i]) &&
+		    bus_space_map(iot, iobase, COM_NPORTS, 0,
+			&sc->sc_slaveioh[i]))
 			panic("bocaattach: couldn't map slave %d", i);
+	}
 
 	printf("\n");
 
diff --git a/sys/dev/isa/rtfps.c b/sys/dev/isa/rtfps.c
index eba82a10e12f..2f7272cd2006 100644
--- a/sys/dev/isa/rtfps.c
+++ b/sys/dev/isa/rtfps.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: rtfps.c,v 1.31 1997/08/23 14:06:19 drochner Exp $	*/
+/*	$NetBSD: rtfps.c,v 1.32 1997/09/12 13:31:12 drochner Exp $	*/
 
 /*
  * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
@@ -155,7 +155,7 @@ rtfpsattach(parent, self, aux)
 		IOBASEUNK, IOBASEUNK, IOBASEUNK, IOBASEUNK
 	};
 	bus_space_tag_t iot = ia->ia_iot;
-	int i;
+	int i, iobase;
 
 	sc->sc_iot = ia->ia_iot;
 	sc->sc_iobase = ia->ia_iobase;
@@ -164,10 +164,13 @@ rtfpsattach(parent, self, aux)
 		panic("rtfpsattach: invalid irq");
 	sc->sc_irqport = irqport[ia->ia_irq];
 
-	for (i = 0; i < NSLAVES; i++)
-		if (bus_space_map(iot, sc->sc_iobase + i * COM_NPORTS,
-		    COM_NPORTS, 0, &sc->sc_slaveioh[i]))
+	for (i = 0; i < NSLAVES; i++) {
+		iobase = sc->sc_iobase + i * COM_NPORTS;
+		if (!com_is_console(iot, iobase, &sc->sc_slaveioh[i]) &&
+		    bus_space_map(iot, iobase, COM_NPORTS, 0,
+			&sc->sc_slaveioh[i]))
 			panic("rtfpsattach: couldn't map slave %d", i);
+	}
 	if (bus_space_map(iot, sc->sc_irqport, 1, 0, &sc->sc_irqioh))
 		panic("rtfpsattach: couldn't map irq port at 0x%x\n",
 		    sc->sc_irqport);