fix ares sysbus peek function after latest update

fixes 72f1495 and closes #3991.

Author: Morilli

Assets/dll/ares64_interpreter.wbx.zst

@@ -735,28 +735,36 @@ static u8 PeekFunc(u64 address)
 
 	if (addr > 0x0403'ffff && addr <= 0x0407'ffff) // RSP
 	{
-		address = (address & 0x3ffff) >> 2;
+		address = (address & 0x1f) >> 2;
 		if (address == 7) // SP_SEMAPHORE
 		{
 			return GetByteFromWord(ares::Nintendo64::rsp.status.semaphore & 1, addr);
 		}
 	}
-	else if (addr > 0x0407'ffff && addr <= 0x040f'ffff) // RSP Status
+	else if (addr > 0x0407'ffff && addr <= 0x040b'ffff) // RSP Status
 	{
-		address = (address & 0x7ffff) >> 2;
+		address = (address & 0x1f) >> 2;
 		if (address == 0) // SP_PC_REG
 		{
 			return GetByteFromWord(ares::Nintendo64::rsp.ipu.pc & 0xFFF, addr);
 		}
 	}
+	else if (addr > 0x040b'ffff && addr <= 0x040f'ffff) // unmapped
+	{
+		return 0;
+	}
 	else if (addr > 0x046f'ffff && addr <= 0x047f'ffff) // RI
 	{
-		address = (address & 0xfffff) >> 2;
+		address = (address & 0x1f) >> 2;
 		if (address == 3) // RI_SELECT
 		{
 			return GetByteFromWord(ares::Nintendo64::ri.io.select, addr);
 		}
 	}
+	else if (addr > 0x048f'ffff && addr <= 0x04ff'ffff) // unmapped
+	{
+		return 0;
+	}
 
 	ares::Nintendo64::Thread unused;
 	return ares::Nintendo64::bus.read<ares::Nintendo64::Byte>(addr, unused, nullptr);