From 1e55231f3c7db8c3c85eeb880652bfd43622a4d2 Mon Sep 17 00:00:00 2001
From: Thomas Jentzsch <tjentzsch@yahoo.de>
Date: Tue, 29 Jun 2021 17:44:08 +0200
Subject: [PATCH] extended single cycle access to everything except Flash

---
 src/emucore/Thumbulator.cxx | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/emucore/Thumbulator.cxx b/src/emucore/Thumbulator.cxx
index 811b3417a..c6473e5fe 100644
--- a/src/emucore/Thumbulator.cxx
+++ b/src/emucore/Thumbulator.cxx
@@ -2991,7 +2991,7 @@ void Thumbulator::incSCycles(uInt32 addr, AccessType accessType)
 {
   uInt32 cycles;
 
-  if((addr & 0xF0000000) == 0x40000000) // RAM
+  if(addr & 0xC0000000) // RAM, peripherals
     cycles = 1;
   else // Flash
   {
@@ -3013,7 +3013,7 @@ void Thumbulator::incNCycles(uInt32 addr, AccessType accessType)
 {
   uInt32 cycles;
 
-  if((addr & 0xF0000000) == 0x40000000) // RAM
+  if(addr & 0xC0000000) // RAM, peripherals
     cycles = 1;
   else // Flash
   {