diff --git a/eightballzp_a2e.S b/eightballzp_a2e.S
new file mode 100644
index 0000000..9d2a00f
--- /dev/null
+++ b/eightballzp_a2e.S
@@ -0,0 +1,11 @@
+;
+; Apple II zero page is used for pointer for indirect addressing
+
+; $80-$9a are used by cc65 ZP segment so avoid this range
+
+; Zero-page usage is documented in:
+; ProDOS 8 Technical Reference Manual Section A.4
+; The upper half of ZP is generally used by BASIC only, so we can use it.
+
+.exportzp _addrptr   := $a0
+