diff --git a/src/main.cpp b/src/main.cpp
index 45ba042..4e068b8 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,4 +1,11 @@
-//#include "stddefs.h"
+/*
+ * Subject: Interrupt Controller (IRQ), irq@MuraxSoc (RV32I)
+ * Lang_s: asm, c, c++
+ * Env: Bare Metal verilated MuraxSoc
+ * Tested: gdb@jtag
+ * mpabi@2024/PI
+ */
+
 #include <stdint.h>
 
 #include "murax.h"
@@ -14,12 +21,6 @@ void println(const char*str){
 //	uart_write(UART,'\n');
 }
 
-void delay(uint32_t loops){
-	for(int i=0;i<loops;i++){
-		int tmp = GPIO_A->OUTPUT;
-	}
-}
-
 volatile int mati = 0;
 
 
@@ -41,12 +42,8 @@ const Timer_Reg* TimeR::ptr = reinterpret_cast<const Timer_Reg*>(0xF0020040);
 
 int main() {
 
-    GPIO_A->OUTPUT_ENABLE = 0x0000000F;
-	GPIO_A->OUTPUT = 0x00000001;
-    println("hello world arty a7 v1");
+//      println("hello world arty a7 v1");
 
-    const int nleds = 4;
-	const int nloops = 10;
 
         interruptCtrl_init(TIMER_INTERRUPT);
         prescaler_init(TIMER_PRESCALER);