Some fixes and code refactoring

2026-05-22 16:40:33 +01:00
parent cca1abf0be
commit b5695b5c2f
7 changed files with 233 additions and 190 deletions
--- a/Core/Memory/SmsMemoryBus.cs
+++ b/Core/Memory/SmsMemoryBus.cs
@@ -42,6 +42,11 @@ namespace Core.Memory

        public byte Read(ushort address)
        {
+            if (address < 0xC000 && !_isCartridgeLoaded)
+            {
+                return 0xFF;
+            }
+
            if (address < 0x4000)
            {
                if (address < 0x0400)
@@ -65,7 +70,7 @@ namespace Core.Memory
                    return _cartridgeRom[(_romBank2 * 0x4000) + (address - 0x8000)];
            }

-            // THE FIX 1: Bitwise AND perfectly forces 0xE000-0xFFFF to mirror down to 0xC000!
+            // Bitwise AND perfectly forces 0xE000-0xFFFF to mirror down to 0xC000!
            return _workRam[address & 0x1FFF];
        }