M CHANGES → CHANGES

@@ -13,6 +13,7 @@ - GB MBC: Fix initializing MBC when no ROM is loaded
  - VFS: Fix resizing memory chunks when not needed
  - GB Memory: Fix patching ROM bank 0
  - GB: Fix audio not being deinitialized
+ - GBA Memory: Fix VCOUNT being writable
 Misc:
  - PSP2: Improved controller rumble
  - GB, GBA: Prevent loading null ROMs

M src/gba/io.c → src/gba/io.c

@@ -336,7 +336,7 @@ gba->memory.io[REG_BG3PD >> 1] = 0x100;
 }
 
 void GBAIOWrite(struct GBA* gba, uint32_t address, uint16_t value) {
-	if (address < REG_SOUND1CNT_LO && address != REG_DISPSTAT) {
+	if (address < REG_SOUND1CNT_LO && (address > REG_VCOUNT || address == REG_DISPCNT)) {
 		value = gba->video.renderer->writeVideoRegister(gba->video.renderer, address, value);
 	} else {
 		switch (address) {
@@ -344,6 +344,10 @@ // Video
 		case REG_DISPSTAT:
 			value &= 0xFFF8;
 			GBAVideoWriteDISPSTAT(&gba->video, value);
+			return;
+
+		case REG_VCOUNT:
+			mLOG(GBA_IO, GAME_ERROR, "Write to read-only I/O register: %03X", address);
 			return;
 
 		// Audio