From: Toni Wilen <twilen@winuae.net>
Date: Mon, 13 Jan 2025 19:34:52 +0000 (+0200)
Subject: Fix BPLCON4 update
X-Git-Url: https://git.unchartedbackwaters.co.uk/w/?a=commitdiff_plain;h=61a123036148f138b4818c9321ada343bf550c03;p=francis%2Fwinuae.git

Fix BPLCON4 update
---

diff --git a/drawing.cpp b/drawing.cpp
index 694f86f9..6c0fc6ce 100644
--- a/drawing.cpp
+++ b/drawing.cpp
@@ -2780,7 +2780,7 @@ static void expand_bplcon4_spr(uae_u16 v)
 static void expand_bplcon4_bm(uae_u16 v)
 {
 	bplcon4_denise &= 0x00ff;
-	bplcon4_denise = v & 0xff00;
+	bplcon4_denise |= v & 0xff00;
 	// Sprite bank change is 1 hires pixel faster than bitplane XOR change
 	if (aga_mode && (bplcon4_denise >> 8) != bplcon4_denise_xor_val2) {
 		bplcon4_denise_xor_val2 = bplcon4_denise >> 8;