diff --git a/vasm/src/vasm.pest b/vasm/src/vasm.pest
index ccd4804..f311863 100644
--- a/vasm/src/vasm.pest
+++ b/vasm/src/vasm.pest
@@ -22,7 +22,7 @@ number = { dec_number | hex_number | bin_number | oct_number | dec_zero | neg_nu
 
 // A label can be any sequence of C-identifier-y characters, as long as it doesn't start with
 // a digit:
-label_char = { ASCII_ALPHA_LOWER | ASCII_ALPHA_UPPER | "_" }
+label_char = { ASCII_ALPHA_LOWER | ASCII_ALPHA_UPPER | "_" | "$" }
 label = @{ label_char ~ (label_char | ASCII_DIGIT | "$")* }
 label_def = { label ~ ":" }
 
diff --git a/vasm/src/vasm_assembler.rs b/vasm/src/vasm_assembler.rs
index 25599fe..1c1a5cc 100644
--- a/vasm/src/vasm_assembler.rs
+++ b/vasm/src/vasm_assembler.rs
@@ -182,16 +182,21 @@ pub fn assemble_snippet<T: IntoIterator<Item = String>>(
     assemble_line_results(line_results)
 }
 
+/// Assemble a file from the filesystem, opening other files as it includes them.
 pub fn assemble_file(filename: &str) -> Result<Vec<u8>, AssembleError> {
     let lines = lines_from_file(filename)?;
     let line_results: Vec<Result<Line, AssembleError>> = LineSource::new(filename, lines, |file| {
+        println!("Including {}", file);
         lines_from_file(file.as_str())
-    }).collect();
+    })
+    .collect();
 
     assemble_line_results(line_results)
 }
 
-fn assemble_line_results(mut line_results: Vec<Result<Line, AssembleError>>) -> Result<Vec<u8>, AssembleError> {
+fn assemble_line_results(
+    mut line_results: Vec<Result<Line, AssembleError>>,
+) -> Result<Vec<u8>, AssembleError> {
     if let Some(Err(error)) = line_results.iter().find(|line| line.is_err()) {
         Err(error.clone())
     } else {
@@ -204,7 +209,8 @@ fn assemble_line_results(mut line_results: Vec<Result<Line, AssembleError>>) ->
 }
 
 fn lines_from_file(filename: &str) -> Result<Vec<String>, AssembleError> {
-    let file = fs::read_to_string(filename).map_err(|_e| AssembleError::FileError(filename.into()))?;
+    let file =
+        fs::read_to_string(filename).map_err(|_e| AssembleError::FileError(filename.into()))?;
     Ok(file.lines().map(String::from).collect())
 }
 
@@ -510,7 +516,8 @@ mod test {
                                     hlt
                                     blah: mul 2
                                     ret"
-                .lines().map(String::from)
+                .lines()
+                .map(String::from)
             ),
             Ok(vec![
                 0x01, 0x03, // nop 3
@@ -524,15 +531,19 @@ mod test {
 
     #[test]
     fn test_relative_blanks() {
-        assert_eq!(assemble_snippet(".org 0x400
+        assert_eq!(
+            assemble_snippet(
+                ".org 0x400
                                     nop $+2
 
                                     nop 0x111111
-                                    nop 0x222222".lines().map(String::from)),
-        Ok(vec![
-            0x03, 0x08, 0x04, 0x00,
-            0x03, 0x11, 0x11, 0x11,
-            0x03, 0x22, 0x22, 0x22
-        ]))
+                                    nop 0x222222"
+                    .lines()
+                    .map(String::from)
+            ),
+            Ok(vec![
+                0x03, 0x08, 0x04, 0x00, 0x03, 0x11, 0x11, 0x11, 0x03, 0x22, 0x22, 0x22
+            ])
+        )
     }
 }
diff --git a/vemu/src/main.rs b/vemu/src/main.rs
index b5b5663..950ae86 100644
--- a/vemu/src/main.rs
+++ b/vemu/src/main.rs
@@ -11,8 +11,10 @@ use winit::{
 use crate::keyboard::convert_keycode;
 use pixels::{Pixels, SurfaceTexture};
 use std::collections::VecDeque;
+use std::fs::File;
+use std::io::Read;
 use std::time::{Duration, Instant};
-use vasm::assemble_snippet;
+use vasm::{assemble_file, assemble_snippet};
 use vcore::cpu::CPU;
 use vcore::memory::{Memory, PeekPoke};
 use vcore::word::Word;
@@ -43,7 +45,11 @@ fn main() {
     let memory = Memory::from(rng);
     let mut cpu = CPU::new(memory);
     display::reset(&mut cpu);
-    let code = assemble_snippet(include_str!("typewriter.asm").lines().map(String::from)).expect("Assemble error");
+    // let code = assemble_snippet(include_str!("typewriter.asm").lines().map(String::from)).expect("Assemble error");
+    // let code = assemble_file("init.asm").expect("Assemble error");
+    let mut file = File::open("4th.rom").expect("ROM not found");
+    let mut code = Vec::new();
+    file.read_to_end(&mut code).expect("Couldn't read ROM");
     println!("ROM size: {} bytes", code.len());
     cpu.poke_slice(0x400.into(), code.as_slice());
     cpu.start();
@@ -103,7 +109,8 @@ fn window_loop(event_loop: EventLoop<()>, window: Window, mut pixels: Pixels, mu
                 let start = Instant::now();
                 draw(pixels.get_frame(), &mut cpu);
                 pixels.render().expect("Problem displaying framebuffer");
-                loop { // TODO: this will run the CPU at 100%, need to not spin while halted
+                loop {
+                    // TODO: this will run the CPU at 100%, need to not spin while halted
                     if let Some((int, arg)) = interrupt_events.pop_front() {
                         cpu.interrupt(int, arg)
                     }
diff --git a/vemu/src/typewriter.asm b/vemu/src/typewriter.asm
index da5f52e..a07a3b1 100644
--- a/vemu/src/typewriter.asm
+++ b/vemu/src/typewriter.asm
@@ -15,7 +15,7 @@ backspace: .equ 0x2a
     call set_video
     push msg
     push screen
-    call print
+    call print_to
 wfi_loop: hlt
     jmpr @wfi_loop
 ;;;;;
@@ -47,7 +47,7 @@ clear_screen:
     pop
     ret
 
-print: ; ( msg addr -- )
+print_to: ; ( msg addr -- )
     pushr
     #while
     dup