diff --git a/lab1/src/main/scala/board/z710/Top.scala b/lab1/src/main/scala/board/z710/Top.scala
index bcecb92..634180b 100644
--- a/lab1/src/main/scala/board/z710/Top.scala
+++ b/lab1/src/main/scala/board/z710/Top.scala
@@ -42,7 +42,6 @@ class Top(binaryFilename: String = "say_goodbye.asmbin") extends Module {
   uart.io.bundle <> dummy.io.bundle
   io.tx := uart.io.txd
   uart.io.rxd := io.rx
-  io.tx := 0.U
 
   val instruction_rom = Module(new InstructionROM(binaryFilename))
   val rom_loader = Module(new ROMLoader(instruction_rom.capacity))