diff --git a/sys/pc98/cbus/sio.c b/sys/pc98/cbus/sio.c
index 87f00dd4fe47..3ccfdf3ca9a7 100644
--- a/sys/pc98/cbus/sio.c
+++ b/sys/pc98/cbus/sio.c
@@ -132,7 +132,7 @@
 #define COM_IF_MCRS98		0x14	/* same as COM_IF_MC16550II */
 #define COM_IF_RSB3000		0x15
 #define COM_IF_RSB384		0x16
-#define COM_IF_MODEM_CARD	0x17	/* same as COM_IF_NS16550 */
+#define COM_IF_MODEM_CARD	0x17
 #define COM_IF_RSA98III		0x18
 #define COM_IF_ESP98		0x19
 #define COM_IF_END2		COM_IF_ESP98
@@ -929,7 +929,11 @@ sio_pccard_probe(dev)
 {
 	/* Do not probe IRQ - pccard doesn't turn on the interrupt line */
 	/* until bus_setup_intr */
+#ifdef PC98
+	SET_FLAG(dev, COM_C_NOPROBE | SET_IFTYPE(COM_IF_MODEM_CARD));
+#else
 	SET_FLAG(dev, COM_C_NOPROBE);
+#endif
 
 	return (sioprobe(dev, 0));
 }
@@ -1147,7 +1151,7 @@ sio_isa_probe(dev)
 #ifdef PC98
 	logical_id = isa_get_logicalid(dev);
 	if (logical_id == 0x0100e4a5)		/* RSA-98III */
-		device_set_flags(dev, SET_IFTYPE(COM_IF_RSA98III));
+		SET_FLAG(dev, SET_IFTYPE(COM_IF_RSA98III));
 #endif
 	return (sioprobe(dev, 0));
 }
@@ -1191,7 +1195,8 @@ sioprobe(dev, xrid)
 	if (IS_8251(iod.if_type)) {
 		port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
 					  0, ~0, 1, RF_ACTIVE);
-	} else if (iod.if_type == COM_IF_RSA98III ||
+	} else if (iod.if_type == COM_IF_MODEM_CARD ||
+		   iod.if_type == COM_IF_RSA98III ||
 		   isa_get_vendorid(dev)) {
 		port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 0, ~0,
 		  if_16550a_type[iod.if_type & 0x0f].iatsz, RF_ACTIVE);
@@ -1729,7 +1734,8 @@ sioattach(dev, xrid)
 	if (IS_8251(if_type)) {
 		port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
 					  0, ~0, 1, RF_ACTIVE);
-	} else if (if_type == COM_IF_RSA98III ||
+	} else if (if_type == COM_IF_MODEM_CARD ||
+		   if_type == COM_IF_RSA98III ||
 		   isa_get_vendorid(dev)) {
 		port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 0, ~0,
 			  if_16550a_type[if_type & 0x0f].iatsz, RF_ACTIVE);
diff --git a/sys/pc98/pc98/sio.c b/sys/pc98/pc98/sio.c
index 87f00dd4fe47..3ccfdf3ca9a7 100644
--- a/sys/pc98/pc98/sio.c
+++ b/sys/pc98/pc98/sio.c
@@ -132,7 +132,7 @@
 #define COM_IF_MCRS98		0x14	/* same as COM_IF_MC16550II */
 #define COM_IF_RSB3000		0x15
 #define COM_IF_RSB384		0x16
-#define COM_IF_MODEM_CARD	0x17	/* same as COM_IF_NS16550 */
+#define COM_IF_MODEM_CARD	0x17
 #define COM_IF_RSA98III		0x18
 #define COM_IF_ESP98		0x19
 #define COM_IF_END2		COM_IF_ESP98
@@ -929,7 +929,11 @@ sio_pccard_probe(dev)
 {
 	/* Do not probe IRQ - pccard doesn't turn on the interrupt line */
 	/* until bus_setup_intr */
+#ifdef PC98
+	SET_FLAG(dev, COM_C_NOPROBE | SET_IFTYPE(COM_IF_MODEM_CARD));
+#else
 	SET_FLAG(dev, COM_C_NOPROBE);
+#endif
 
 	return (sioprobe(dev, 0));
 }
@@ -1147,7 +1151,7 @@ sio_isa_probe(dev)
 #ifdef PC98
 	logical_id = isa_get_logicalid(dev);
 	if (logical_id == 0x0100e4a5)		/* RSA-98III */
-		device_set_flags(dev, SET_IFTYPE(COM_IF_RSA98III));
+		SET_FLAG(dev, SET_IFTYPE(COM_IF_RSA98III));
 #endif
 	return (sioprobe(dev, 0));
 }
@@ -1191,7 +1195,8 @@ sioprobe(dev, xrid)
 	if (IS_8251(iod.if_type)) {
 		port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
 					  0, ~0, 1, RF_ACTIVE);
-	} else if (iod.if_type == COM_IF_RSA98III ||
+	} else if (iod.if_type == COM_IF_MODEM_CARD ||
+		   iod.if_type == COM_IF_RSA98III ||
 		   isa_get_vendorid(dev)) {
 		port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 0, ~0,
 		  if_16550a_type[iod.if_type & 0x0f].iatsz, RF_ACTIVE);
@@ -1729,7 +1734,8 @@ sioattach(dev, xrid)
 	if (IS_8251(if_type)) {
 		port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
 					  0, ~0, 1, RF_ACTIVE);
-	} else if (if_type == COM_IF_RSA98III ||
+	} else if (if_type == COM_IF_MODEM_CARD ||
+		   if_type == COM_IF_RSA98III ||
 		   isa_get_vendorid(dev)) {
 		port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 0, ~0,
 			  if_16550a_type[if_type & 0x0f].iatsz, RF_ACTIVE);