diff --git a/sys/dev/ida/ida_eisa.c b/sys/dev/ida/ida_eisa.c
index f5e8af162af7..fd3fd29e2015 100644
--- a/sys/dev/ida/ida_eisa.c
+++ b/sys/dev/ida/ida_eisa.c
@@ -247,7 +247,6 @@ ida_eisa_probe(device_t dev)
 		return (ENXIO);
 	}
 
-	eisa_add_iospace(dev, io_base, 0x100, RESVADDR_NONE);
 	eisa_add_iospace(dev, (io_base + IDA_EISA_IOPORT_START),
 			 IDA_EISA_IOPORT_LEN, RESVADDR_NONE);
 
diff --git a/sys/dev/ida/idareg.h b/sys/dev/ida/idareg.h
index 8a28c1569f74..3ba79522907d 100644
--- a/sys/dev/ida/idareg.h
+++ b/sys/dev/ida/idareg.h
@@ -33,21 +33,20 @@
 /*
  * defines for older EISA controllers (IDA, IDA-2, IAES, SMART)
  */
-#define R_EISA_INT_MASK			0xC89
-#define R_EISA_LOCAL_MASK		0xC8C
-#define R_EISA_LOCAL_DOORBELL		0xC8D
-#define R_EISA_SYSTEM_MASK		0xC8E
-#define R_EISA_SYSTEM_DOORBELL		0xC8F
-#define R_EISA_LIST_ADDR		0xC90
-#define R_EISA_LIST_LEN			0xC94
-#define R_EISA_TAG			0xC97
-#define R_EISA_COMPLETE_ADDR		0xC98
-#define R_EISA_LIST_STATUS		0xC9E
+#define R_EISA_INT_MASK			0x01
+#define R_EISA_LOCAL_MASK		0x04
+#define R_EISA_LOCAL_DOORBELL		0x05
+#define R_EISA_SYSTEM_MASK		0x06
+#define R_EISA_SYSTEM_DOORBELL		0x07
+#define R_EISA_LIST_ADDR		0x08
+#define R_EISA_LIST_LEN			0x0c
+#define R_EISA_TAG			0x0f
+#define R_EISA_COMPLETE_ADDR		0x10
+#define R_EISA_LIST_STATUS		0x16
 
 #define EISA_CHANNEL_BUSY		0x01
 #define EISA_CHANNEL_CLEAR		0x02
 
-
 /*
  * board register offsets for SMART-2 controllers
  */
@@ -63,7 +62,6 @@
 #define INT_DISABLE	0x00
 #define INT_ENABLE	0x01
 
-
 /*
  * board offsets for the 42xx series
  */
@@ -79,7 +77,6 @@
 #define INT_DISABLE_42XX		0x08
 #define STATUS_42XX_INT_PENDING		0x08
 
-
 /*
  * return status codes
  */