diff --git a/address.txt b/address.txt
new file mode 100644
index 0000000..aa4fb4f
--- /dev/null
+++ b/address.txt
@@ -0,0 +1,10 @@
+$000000-$01FFFF ROM
+$100000-$1FFFFF RAM
+$F00000-$F000FF IO0
+$F00100-$F001FF IO1
+$F00200-$F002FF IO2
+$F00300-$F003FF IO3
+$F00400-$F004FF IO4
+$F00500-$F005FF IO5
+$F00600-$F006FF IO6
+$F00700-$F007FF IO7