From 386f572e9a8e53a4b60c23b89b062e386ae48b97 Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Thu, 4 Jan 2024 11:11:26 -0500
Subject: [PATCH] Add assert.

---
 Machines/Apple/AppleIIgs/MemoryMap.hpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Machines/Apple/AppleIIgs/MemoryMap.hpp b/Machines/Apple/AppleIIgs/MemoryMap.hpp
index 866952d7c..92033f339 100644
--- a/Machines/Apple/AppleIIgs/MemoryMap.hpp
+++ b/Machines/Apple/AppleIIgs/MemoryMap.hpp
@@ -71,6 +71,7 @@ class MemoryMap {
 
 		bool is_shadowed(const Region &region, uint32_t address) const {
 			const auto physical = physical_address(region, address);
+			assert(physical >= 0 && physical <= 0xff'ffff);
 			return shadow_pages_[(physical >> 10) & 127] & shadow_banks_[physical >> 17];
 		}
 		void write(const Region &region, uint32_t address, uint8_t value) {