diff --git a/ecplorer/src/args.rs b/ecplorer/src/args.rs
index 03e83a6..cf10753 100644
--- a/ecplorer/src/args.rs
+++ b/ecplorer/src/args.rs
@@ -38,7 +38,9 @@ pub enum Operation {
     },
     /// Write a pattern to the whole address space
     WritePattern {
-        // TODO
+        /// Bytes to write to every address
+        #[arg(value_parser = clap_num::maybe_hex::<u8>)]
+        bytes: Vec<u8>,
     },
     /// Write a value to a specific address
     Write {
diff --git a/ecplorer/src/main.rs b/ecplorer/src/main.rs
index 9ec5d06..08b4002 100644
--- a/ecplorer/src/main.rs
+++ b/ecplorer/src/main.rs
@@ -4,6 +4,7 @@ use smokepatio::ec::EmbeddedController;
 
 fn main() {
     let cli = args::Args::load();
+    #[cfg(debug_assertions)]
     println!("args: {:?}", cli);
 
     let mut ec = EmbeddedController::new(cli.data_address, cli.cmd_address);
@@ -15,11 +16,34 @@ fn main() {
     }
 
     match cli.op {
-        args::Operation::ReadAll => todo!(),
+        args::Operation::ReadAll => {
+            let (bytes_per_line, range) = if cli.extended { (16, 0..=u16::MAX) } else { (8, 0..=(u8::MAX as u16)) };
+            for addr in range {
+                let addr_mod = addr % bytes_per_line;
+                if addr_mod == 0 {
+                    print!("{:#02x}: ", addr);
+                }
+                print!("{:#02x} ", ec.get(addr));
+                if addr_mod == (bytes_per_line - 1) {
+                    println!("");
+                } else {
+                    print!(" ");
+                }
+            }
+            println!("");
+        },
         args::Operation::Read { address } => {
             println!("{:#02x}", ec.get(address));
         },
-        args::Operation::WritePattern {  } => todo!(),
+        args::Operation::WritePattern { bytes } => {
+            let range = if cli.extended { 0..=u16::MAX } else { 0..=(u8::MAX as u16) };
+            for addr in range {
+                println!("{:#02x}", addr);
+                for b in bytes.iter() {
+                    ec.set(addr, *b);
+                }
+            }
+        },
         args::Operation::Write { address, value } => {
             ec.set(address, value);
         },