diff --git a/INC/IO.IIC.I.txt b/INC/IO.IIC.I.txt
new file mode 100644
index 00000000..f4d7ba9f
--- /dev/null
+++ b/INC/IO.IIC.I.txt
@@ -0,0 +1,16 @@
+NEW
+  AUTO 3,1
+				.LIST OFF
+*--------------------------------------
+IO.IIC.RDVBLMSK	.EQ $C041				R, B7=1: VBL interrupts enabled
+*--------------------------------------
+* The action taken for the soft switches 
+* from $C058 ... $C05F is only taken if access 
+* has first been enabled by writing to IOUDISOFF ($C07F).] 
+*--------------------------------------
+IO.IIC.DISVBL	.EQ $C05A				W, Disable VBL interrupts
+IO.IIC.ENVBL	.EQ $C05B				W, Enable VBL interrupts
+IO.IIC.CLRVBLIRQ .EQ $C070				R, Clear the VBL interrupt condition 
+*--------------------------------------
+MAN
+SAVE INC/IO.IIC.I
diff --git a/INC/IO.IICI.txt b/INC/IO.IICI.txt
deleted file mode 100644
index bc520bde..00000000
--- a/INC/IO.IICI.txt
+++ /dev/null
@@ -1,11 +0,0 @@
-NEW
-  AUTO 3,1
-				.LIST OFF
-*--------------------------------------
-IO.IIC.RDVBLMSK	.EQ $C041
-IO.IIC.DISVBL 	.EQ $C05A				W,Disable VBL interrupts
-IO.IIC.ENVBL	.EQ $C05B
-IO.IIC.CLRVBLIRQ	.EQ $C070
-*--------------------------------------
-MAN
-SAVE INC/IO.IIC.I