diff --git a/src/main.rs b/src/main.rs
index 6cc5fcd..4e97d48 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -132,6 +132,7 @@ impl Memory {
     }
 
     fn set(&mut self, address: Address, data: u8) {
+        println!("write addr: {:#X}, data: {:#X}", address, data);
         match address {
             0x0..0x100 => {
                 if !self.bootrom_enabled {
diff --git a/src/processor.rs b/src/processor.rs
index f2d4e5a..54c8c9f 100644
--- a/src/processor.rs
+++ b/src/processor.rs
@@ -31,6 +31,10 @@ impl CPU {
         unsafe { self.last_instruction_addr = self.state.pc.as_u16 };
         let opcode = self.next_opcode();
         self.last_instruction = opcode;
+        println!(
+            "exec {:#4X} from pc: {:#X}",
+            opcode, self.last_instruction_addr
+        );
 
         match opcode {
             0x0 => {