diff --git a/ioport.c b/ioport.c
index 8f50ffd..251972d 100644
--- a/ioport.c
+++ b/ioport.c
@@ -53,10 +53,12 @@ static struct ioport_operations *ioport_ops[USHRT_MAX] = {
 	[0x70]		= &cmos_ram_rtc_ops,
 
 	/* 0x0020 - 0x003F - 8259A PIC 1 */
-	[0x21]		= &dummy_write_only_ioport_ops,
+	[0x20]		= &dummy_read_write_ioport_ops,
+	[0x21]		= &dummy_read_write_ioport_ops,
 
 	/* 0x00A0 - 0x00AF - 8259A PIC 2 */
-	[0xA1]		= &dummy_write_only_ioport_ops,
+	[0xA0]		= &dummy_read_write_ioport_ops,
+	[0xA1]		= &dummy_read_write_ioport_ops,
 
 	/* 0x00F0 - 0x00FF - Math co-processor */
 	[0xF0]		= &dummy_write_only_ioport_ops,