From 54c3c197ab7833c1bd1a51827391312f8c4dc536 Mon Sep 17 00:00:00 2001
From: Christian Speckner <christian.speckner@mayflower.de>
Date: Thu, 19 Jun 2025 19:48:49 +0200
Subject: [PATCH] Properly initialise the shadow registers for HMxy.

---
 src/emucore/tia/TIA.cxx | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/emucore/tia/TIA.cxx b/src/emucore/tia/TIA.cxx
index 5d3d29e37..0b41306e4 100644
--- a/src/emucore/tia/TIA.cxx
+++ b/src/emucore/tia/TIA.cxx
@@ -151,6 +151,7 @@ void TIA::initialize()
   myXAtRenderingStart = 0;
 
   myShadowRegisters.fill(0);
+  for (auto reg: {HMP0, HMP1, HMM0, HMM1, HMBL}) myShadowRegisters[reg] = 0x80;
 
   myBackground.reset();
   myPlayfield.reset();