diff --git a/src/debugger/command.rs b/src/debugger/command.rs
new file mode 100644
index 0000000..3dca54d
--- /dev/null
+++ b/src/debugger/command.rs
@@ -0,0 +1,107 @@
+use crate::debugger::Debugger;
+use crate::disass::Disassembler;
+
+use colored::*;
+use hexdump;
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum Command {
+    Info,
+    SingleStep,
+    Continue,
+    HexDump(u32, usize),
+    Disass(u32, usize),
+    AddBreakpoint(u32),
+    DelBreakpoint(u32),
+    ClearBreakpoints,
+    ListBreakpoints,
+    Reset,
+    Quit,
+}
+
+impl Command {
+    pub fn run(&self, debugger: &mut Debugger) {
+        use Command::*;
+        match *self {
+            Info => println!("{}", debugger.cpu),
+            SingleStep => {
+                if let Some(bp) = debugger.check_breakpoint() {
+                    println!("breakpoint #{} reached!", bp);
+                    debugger.delete_breakpoint(bp);
+                } else {
+                    match debugger.cpu.step(&mut debugger.sysbus) {
+                        Ok(_) => (),
+                        Err(e) => {
+                            println!("{}: {}", "cpu encountered an error".red(), e);
+                            println!("cpu: {:#x?}", debugger.cpu)
+                        }
+                    }
+                }
+            }
+            Continue => loop {
+                if let Some(bp) = debugger.check_breakpoint() {
+                    println!("breakpoint #{} reached!", bp);
+                    debugger.delete_breakpoint(bp);
+                    break;
+                }
+                match debugger.cpu.step(&mut debugger.sysbus) {
+                    Ok(_) => (),
+                    Err(e) => {
+                        println!("{}: {}", "cpu encountered an error".red(), e);
+                        println!("cpu: {:#x?}", debugger.cpu);
+                        break;
+                    }
+                };
+            },
+            HexDump(addr, nbytes) => {
+                let bytes = match debugger.sysbus.get_bytes(addr, nbytes) {
+                    Some(bytes) => bytes,
+                    None => {
+                        println!("requested content out of bounds");
+                        return;
+                    }
+                };
+                hexdump::hexdump(bytes);
+            }
+            Disass(addr, n) => {
+                let bytes = match debugger.sysbus.get_bytes(addr, 4 * n) {
+                    Some(bytes) => bytes,
+                    None => {
+                        println!("requested content out of bounds");
+                        return;
+                    }
+                };
+                let disass = Disassembler::new(addr, bytes);
+                for line in disass {
+                    println!("{}", line)
+                }
+            }
+            Quit => {
+                print!("Quitting!");
+                debugger.stop();
+            }
+            AddBreakpoint(addr) => {
+                if !debugger.breakpoints.contains(&addr) {
+                    let new_index = debugger.breakpoints.len();
+                    debugger.breakpoints.push(addr);
+                    println!("added breakpoint [{}] 0x{:08x}", new_index, addr);
+                } else {
+                    println!("breakpoint already exists!")
+                }
+            }
+            DelBreakpoint(addr) => debugger.delete_breakpoint(addr),
+            ClearBreakpoints => debugger.breakpoints.clear(),
+            ListBreakpoints => {
+                println!("breakpoint list:");
+                for (i, b) in debugger.breakpoints.iter().enumerate() {
+                    println!("[{}] 0x{:08x}", i, b)
+                }
+            }
+            Reset => {
+                println!("resetting cpu...");
+                debugger.cpu.reset();
+                println!("cpu is restarted!")
+            }
+        }
+    }
+}
diff --git a/src/debugger/mod.rs b/src/debugger/mod.rs
index 1f04599..8eeb684 100644
--- a/src/debugger/mod.rs
+++ b/src/debugger/mod.rs
@@ -3,16 +3,15 @@ use rustyline::Editor;
 
 use colored::*;
 
-use hexdump;
-
 use super::arm7tdmi::cpu;
 use super::sysbus::SysBus;
 
-use crate::disass::Disassembler;
-
 mod parser;
 use parser::{parse_expr, Expr, Value};
 
+mod command;
+use command::Command;
+
 #[derive(Debug, PartialEq)]
 pub enum DebuggerError {
     ParsingError(String),
@@ -30,107 +29,13 @@ impl From<cpu::CpuError> for DebuggerError {
 
 type DebuggerResult<T> = Result<T, DebuggerError>;
 
-#[derive(Debug, PartialEq, Clone)]
-pub enum Command {
-    Info,
-    SingleStep,
-    Continue,
-    HexDump(u32, usize),
-    Disass(u32, usize),
-    AddBreakpoint(u32),
-    ListBreakpoints,
-    Reset,
-    Quit,
-}
-
-impl Command {
-    fn run(&self, debugger: &mut Debugger) {
-        use Command::*;
-        match *self {
-            Info => println!("{}", debugger.cpu),
-            SingleStep => {
-                match debugger.cpu.step(&mut debugger.sysbus) {
-                    Ok(_) => (),
-                    Err(e) => {
-                        println!("{}: {}", "cpu encountered an error".red(), e);
-                        println!("cpu: {:#x?}", debugger.cpu);
-                    }
-                };
-                if debugger.is_breakpoint_reached() {
-                    println!("breakpoint 0x{:08x} reached!", debugger.cpu.pc)
-                }
-            }
-            Continue => loop {
-                match debugger.cpu.step(&mut debugger.sysbus) {
-                    Ok(_) => (),
-                    Err(e) => {
-                        println!("{}: {}", "cpu encountered an error".red(), e);
-                        println!("cpu: {:#x?}", debugger.cpu);
-                        break;
-                    }
-                };
-                if debugger.is_breakpoint_reached() {
-                    println!("breakpoint 0x{:08x} reached!", debugger.cpu.pc)
-                }
-            },
-            HexDump(addr, nbytes) => {
-                let bytes = match debugger.sysbus.get_bytes(addr, nbytes) {
-                    Some(bytes) => bytes,
-                    None => {
-                        println!("requested content out of bounds");
-                        return;
-                    }
-                };
-                hexdump::hexdump(bytes);
-            }
-            Disass(addr, n) => {
-                let bytes = match debugger.sysbus.get_bytes(addr, 4 * n) {
-                    Some(bytes) => bytes,
-                    None => {
-                        println!("requested content out of bounds");
-                        return;
-                    }
-                };
-                let disass = Disassembler::new(addr, bytes);
-                for line in disass {
-                    println!("{}", line)
-                }
-            }
-            Quit => {
-                print!("Quitting!");
-                debugger.stop();
-            }
-            AddBreakpoint(addr) => {
-                if !debugger.breakpoints.contains(&addr) {
-                    let new_index = debugger.breakpoints.len();
-                    debugger.breakpoints.push(addr);
-                    println!("added breakpoint [{}] 0x{:08x}", new_index, addr);
-                } else {
-                    println!("breakpoint already exists!")
-                }
-            }
-            ListBreakpoints => {
-                println!("breakpoint list:");
-                for (i, b) in debugger.breakpoints.iter().enumerate() {
-                    println!("[{}] 0x{:08x}", i, b)
-                }
-            }
-            Reset => {
-                println!("resetting cpu...");
-                debugger.cpu.reset();
-                println!("cpu is restarted!")
-            }
-        }
-    }
-}
-
 #[derive(Debug)]
 pub struct Debugger {
-    cpu: cpu::Core,
-    sysbus: SysBus,
+    pub cpu: cpu::Core,
+    pub sysbus: SysBus,
     running: bool,
     breakpoints: Vec<u32>,
-    previous_command: Option<Command>,
+    pub previous_command: Option<Command>,
 }
 
 impl Debugger {
@@ -140,46 +45,57 @@ impl Debugger {
             sysbus: sysbus,
             breakpoints: Vec::new(),
             running: false,
-            previous_command: None
+            previous_command: None,
         }
     }
 
-    fn is_breakpoint_reached(&self) -> bool {
-        let pc = self.cpu.pc;
-        for b in &self.breakpoints {
-            if *b == pc {
-                return true;
+    pub fn check_breakpoint(&self) -> Option<u32> {
+        let pc = self.cpu.get_reg(15);
+        for bp in &self.breakpoints {
+            if *bp == pc {
+                return Some(pc);
             }
         }
 
-        false
+        None
     }
 
+    pub fn delete_breakpoint(&mut self, addr: u32) {
+        self.breakpoints.retain(|&a| a != addr);
+    }
 
     fn decode_reg(&self, s: &str) -> DebuggerResult<usize> {
         let reg_names = vec![
-            "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "fp", "ip", "sp", "lr",
-            "pc"];
+            "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "fp", "ip", "sp",
+            "lr", "pc",
+        ];
 
         match reg_names.into_iter().position(|r| r == s) {
             Some(index) => Ok(index),
-            None => Err(DebuggerError::InvalidArgument(format!("{:?} is not a register name", s)))
+            None => Err(DebuggerError::InvalidArgument(format!(
+                "{:?} is not a register name",
+                s
+            ))),
         }
     }
 
     fn val_reg(&self, arg: &Value) -> DebuggerResult<usize> {
         match arg {
-            Value::Name(reg) => {
-                self.decode_reg(&reg)
-            },
-            v => Err(DebuggerError::InvalidArgument(format!("expected a number, got {:?}", v)))
+            Value::Name(reg) => self.decode_reg(&reg),
+            v => Err(DebuggerError::InvalidArgument(format!(
+                "expected a number, got {:?}",
+                v
+            ))),
         }
     }
 
     fn val_number(&self, arg: &Value) -> DebuggerResult<u32> {
         match arg {
             Value::Num(n) => Ok(*n),
-            v => Err(DebuggerError::InvalidArgument(format!("expected a number, got {:?}", v)))
+            v => Err(DebuggerError::InvalidArgument(format!(
+                "expected a number, got {:?}",
+                v
+            ))),
         }
     }
 
@@ -190,7 +106,10 @@ impl Debugger {
                 let reg = self.decode_reg(&reg)?;
                 Ok(self.cpu.get_reg(reg))
             }
-            v => Err(DebuggerError::InvalidArgument(format!("addr: expected a number or register, got {:?}", v)))
+            v => Err(DebuggerError::InvalidArgument(format!(
+                "addr: expected a number or register, got {:?}",
+                v
+            ))),
         }
     }
 
@@ -206,10 +125,33 @@ impl Debugger {
             "i" | "info" => Ok(Command::Info),
             "s" | "step" => Ok(Command::SingleStep),
             "c" | "continue" => Ok(Command::Continue),
-            "xxd" => {
-                let addr = self.val_address(&args[0])?;
-                let nbytes = self.val_number(&args[1])?;
-                Ok(Command::HexDump(addr, nbytes as usize))
+            "x" | "hexdump" => {
+                let (addr, n) = match args.len() {
+                    2 => {
+                        let addr = self.val_address(&args[0])?;
+                        let n = self.val_number(&args[1])?;
+
+                        (addr, n as usize)
+                    }
+                    1 => {
+                        let addr = self.val_address(&args[0])?;
+
+                        (addr, 0x100)
+                    }
+                    0 => {
+                        if let Some(Command::HexDump(addr, n)) = self.previous_command {
+                            (addr + (4 * n as u32), 0x100)
+                        } else {
+                            (self.cpu.get_reg(15), 0x100)
+                        }
+                    }
+                    _ => {
+                        return Err(DebuggerError::InvalidCommandFormat(
+                            "xxd [addr] [n]".to_string(),
+                        ))
+                    }
+                };
+                Ok(Command::HexDump(addr, n))
             }
             "d" | "disass" => {
                 let (addr, n) = match args.len() {
@@ -243,13 +185,23 @@ impl Debugger {
             "b" | "break" => {
                 if args.len() != 1 {
                     Err(DebuggerError::InvalidCommandFormat(
-                        "disass <addr>".to_string(),
+                        "break <addr>".to_string(),
                     ))
                 } else {
-                    let addr =  self.val_address(&args[0])?;
+                    let addr = self.val_address(&args[0])?;
                     Ok(Command::AddBreakpoint(addr))
                 }
             }
+            "bd" | "breakdel" => match args.len() {
+                0 => Ok(Command::ClearBreakpoints),
+                1 => {
+                    let addr = self.val_address(&args[0])?;
+                    Ok(Command::DelBreakpoint(addr))
+                }
+                _ => Err(DebuggerError::InvalidCommandFormat(String::from(
+                    "breakdel [addr]",
+                ))),
+            },
             "bl" => Ok(Command::ListBreakpoints),
             "q" | "quit" => Ok(Command::Quit),
             "r" | "reset" => Ok(Command::Reset),
@@ -271,7 +223,7 @@ impl Debugger {
                 Ok(cmd) => {
                     self.previous_command = Some(cmd.clone());
                     cmd.run(self)
-                },
+                }
                 Err(DebuggerError::InvalidCommand(c)) => {
                     println!("{}: {:?}", "invalid command".red(), c)
                 }
@@ -284,9 +236,11 @@ impl Debugger {
                 Err(e) => println!("{} {:?}", "failed to build command".red(), e),
             },
             Expr::Assignment(lvalue, rvalue) => match self.eval_assignment(lvalue, rvalue) {
-                Err(DebuggerError::InvalidArgument(m)) => println!("{}: {}", "assignment error".red(), m),
-                _ => ()
-            }
+                Err(DebuggerError::InvalidArgument(m)) => {
+                    println!("{}: {}", "assignment error".red(), m)
+                }
+                _ => (),
+            },
             Expr::Empty => println!("Got empty expr"),
         }
     }
@@ -296,6 +250,7 @@ impl Debugger {
     }
 
     pub fn repl(&mut self) -> DebuggerResult<()> {
+        println!("Welcome to rustboyadvance-NG debugger 😎!\n");
         self.running = true;
         let mut rl = Editor::<()>::new();
         rl.load_history(".rustboyadvance_history");