From f6a662a276e990e037a94d3f941f6fcf26c397f6 Mon Sep 17 00:00:00 2001
From: mgcaret <mgcaret@users.noreply.github.com>
Date: Fri, 17 Mar 2017 09:06:30 -0700
Subject: [PATCH] Update rom5_zeros.txt

---
 notes/rom5_zeros.txt | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/notes/rom5_zeros.txt b/notes/rom5_zeros.txt
index 43f3ede..6db3743 100644
--- a/notes/rom5_zeros.txt
+++ b/notes/rom5_zeros.txt
@@ -27,3 +27,13 @@ FCC9 - 55 bytes
 FE96 - 352 bytes - but reserve 65816 vectors
                  - Future ROM 5X accelerator enhancements
 
+Other potential usable space:
+Aux Bank
+D249-D32B - 227 bytes
+This is the ROM checksum diagnostic, and we currently patch around it
+because it fails with the ROM 5X patches in place, for obvious reasons.
+We could fix the checksum, or reclaim the space.
+To patch around it in a reclaimable fashion, a the JSR instruction at
+C53D and the following carry check and JSR must be patched out, easiest
+by placing BRA C555 at C53D.
+