diff --git a/src/main.rs b/src/main.rs
index 4f1c1c7..a7202f4 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -7,6 +7,7 @@ mod disas;
 mod instruction;
 mod location;
 mod m68k;
+mod peek;
 mod ram;
 mod rom;
 mod storage;
@@ -24,104 +25,15 @@ use disas::DisassemblyError;
 use indexmap::IndexSet;
 use itertools::Itertools;
 use parse_int::parse;
+use peek::{PeekFormat, PeekSize};
 use reedline_repl_rs::{
     clap::{builder::BoolishValueParser, Arg, ArgAction, Command},
     Error as ReplError, Repl,
 };
 use serde::Deserialize;
 use serde_yaml::Mapping;
-use std::{convert::TryFrom, fs, path::Path, process};
+use std::{fs, path::Path, process};
 use symbol_tables::SymbolTables;
-use thiserror::Error;
-
-#[derive(Copy, Clone, Debug)]
-enum PeekFormat {
-    Octal,
-    Hex,
-    Decimal,
-    UnsignedDecimal,
-    Binary,
-}
-
-impl PeekFormat {
-    pub fn format(self, num: u32, size: PeekSize) -> String {
-        match self {
-            Self::Octal => format!("Oo{:0>width$o}", num, width = size.byte_count()),
-            Self::Hex => format!("0x{:0>width$x}", num, width = size.byte_count() * 2),
-            Self::Decimal => {
-                let num = match size {
-                    PeekSize::Byte => num as u8 as i8 as i32,
-                    PeekSize::Word => num as u16 as i16 as i32,
-                    PeekSize::LongWord => num as i32,
-                };
-                format!("{}", num)
-            }
-            Self::UnsignedDecimal => format!("{}", num),
-            Self::Binary => format!("0b{:0>width$b}", num, width = size.byte_count() * 8),
-        }
-    }
-}
-
-#[derive(Debug, Copy, Clone, Error)]
-#[error("Invalid peek format")]
-struct InvalidPeekFormat;
-
-impl TryFrom<char> for PeekFormat {
-    type Error = InvalidPeekFormat;
-
-    fn try_from(value: char) -> Result<Self, Self::Error> {
-        match value {
-            'o' => Ok(Self::Octal),
-            'x' => Ok(Self::Hex),
-            'd' => Ok(Self::Decimal),
-            'u' => Ok(Self::UnsignedDecimal),
-            'b' => Ok(Self::Binary),
-            _ => Err(InvalidPeekFormat),
-        }
-    }
-}
-
-#[derive(Copy, Clone, Debug)]
-enum PeekSize {
-    Byte,
-    Word,
-    LongWord,
-}
-
-impl PeekSize {
-    fn byte_count(self) -> usize {
-        match self {
-            PeekSize::Byte => 1,
-            PeekSize::Word => 2,
-            PeekSize::LongWord => 4,
-        }
-    }
-
-    fn chunk_size(self) -> usize {
-        match self {
-            PeekSize::Byte => 8,
-            PeekSize::Word => 8,
-            PeekSize::LongWord => 4,
-        }
-    }
-}
-
-#[derive(Debug, Copy, Clone, Error)]
-#[error("Invalid peek size")]
-struct InvalidPeekSize;
-
-impl TryFrom<char> for PeekSize {
-    type Error = InvalidPeekSize;
-
-    fn try_from(value: char) -> Result<Self, Self::Error> {
-        match value {
-            'b' => Ok(Self::Byte),
-            'w' => Ok(Self::Word),
-            'l' => Ok(Self::LongWord),
-            _ => Err(InvalidPeekSize),
-        }
-    }
-}
 
 #[derive(Deserialize, Debug)]
 struct CardConfig<'a> {
diff --git a/src/peek.rs b/src/peek.rs
new file mode 100644
index 0000000..f01bfe8
--- /dev/null
+++ b/src/peek.rs
@@ -0,0 +1,90 @@
+use thiserror::Error;
+
+#[derive(Copy, Clone, Debug)]
+pub enum PeekFormat {
+    Octal,
+    Hex,
+    Decimal,
+    UnsignedDecimal,
+    Binary,
+}
+
+impl PeekFormat {
+    pub fn format(self, num: u32, size: PeekSize) -> String {
+        match self {
+            Self::Octal => format!("Oo{:0>width$o}", num, width = size.byte_count()),
+            Self::Hex => format!("0x{:0>width$x}", num, width = size.byte_count() * 2),
+            Self::Decimal => {
+                let num = match size {
+                    PeekSize::Byte => num as u8 as i8 as i32,
+                    PeekSize::Word => num as u16 as i16 as i32,
+                    PeekSize::LongWord => num as i32,
+                };
+                format!("{}", num)
+            }
+            Self::UnsignedDecimal => format!("{}", num),
+            Self::Binary => format!("0b{:0>width$b}", num, width = size.byte_count() * 8),
+        }
+    }
+}
+
+#[derive(Debug, Copy, Clone, Error)]
+#[error("Invalid peek format")]
+pub struct InvalidPeekFormat;
+
+impl TryFrom<char> for PeekFormat {
+    type Error = InvalidPeekFormat;
+
+    fn try_from(value: char) -> Result<Self, Self::Error> {
+        match value {
+            'o' => Ok(Self::Octal),
+            'x' => Ok(Self::Hex),
+            'd' => Ok(Self::Decimal),
+            'u' => Ok(Self::UnsignedDecimal),
+            'b' => Ok(Self::Binary),
+            _ => Err(InvalidPeekFormat),
+        }
+    }
+}
+
+#[derive(Copy, Clone, Debug)]
+pub enum PeekSize {
+    Byte,
+    Word,
+    LongWord,
+}
+
+impl PeekSize {
+    pub fn byte_count(self) -> usize {
+        match self {
+            PeekSize::Byte => 1,
+            PeekSize::Word => 2,
+            PeekSize::LongWord => 4,
+        }
+    }
+
+    pub fn chunk_size(self) -> usize {
+        match self {
+            PeekSize::Byte => 8,
+            PeekSize::Word => 8,
+            PeekSize::LongWord => 4,
+        }
+    }
+}
+
+#[derive(Debug, Copy, Clone, Error)]
+#[error("Invalid peek size")]
+pub struct InvalidPeekSize;
+
+impl TryFrom<char> for PeekSize {
+    type Error = InvalidPeekSize;
+
+    fn try_from(value: char) -> Result<Self, Self::Error> {
+        match value {
+            'b' => Ok(Self::Byte),
+            'w' => Ok(Self::Word),
+            'l' => Ok(Self::LongWord),
+            _ => Err(InvalidPeekSize),
+        }
+    }
+}