diff --git a/src/backplane.rs b/src/backplane.rs
index 7806a91..b7d1175 100644
--- a/src/backplane.rs
+++ b/src/backplane.rs
@@ -148,7 +148,7 @@ impl Backplane {
             .get(card_num as usize)
             .ok_or_else(|| anyhow!("Card {} does not exist", card_num))?
             .borrow_mut()
-            .cmd(cmd)
+            .cmd(cmd, &self)
     }
 
     pub fn read_word(&self, address: u32, supervisor: bool) -> Result<u16, BusError> {
diff --git a/src/card.rs b/src/card.rs
index 3643580..9e53509 100644
--- a/src/card.rs
+++ b/src/card.rs
@@ -112,7 +112,7 @@ pub trait Card: Debug + Display + mopa::Any {
         NullableResult::Ok(())
     }
 
-    fn cmd(&mut self, _cmd: &[&str]) -> anyhow::Result<()> {
+    fn cmd(&mut self, _cmd: &[&str], _backplane: &Backplane) -> anyhow::Result<()> {
         Ok(())
     }
 
diff --git a/src/m68k.rs b/src/m68k.rs
index 2388ba8..644a4b7 100644
--- a/src/m68k.rs
+++ b/src/m68k.rs
@@ -1690,7 +1690,7 @@ impl M68K {
                 } else {
                     Ok(pc.wrapping_sub((-d as u16).into()))
                 }
-            },
+            }
             EffectiveAddress::AbsoluteShort(x) => Ok(u32::from(x)),
             EffectiveAddress::AbsoluteLong(x) => Ok(x),
             EffectiveAddress::DataReg(_)
diff --git a/src/mmu.rs b/src/mmu.rs
index 6a4959e..c75df9f 100644
--- a/src/mmu.rs
+++ b/src/mmu.rs
@@ -3,7 +3,7 @@ use std::fmt::Display;
 use nullable_result::NullableResult;
 
 use crate::{
-    backplane::Backplane,
+    backplane::{self, Backplane},
     card::{u16_get_be_byte, u32_get_be_byte, u32_set_be_byte, Card, Mmu},
     m68k::BusError,
     register,
@@ -114,7 +114,7 @@ impl Card for MmuCard {
         NullableResult::Ok(())
     }
 
-    fn cmd(&mut self, cmd: &[&str]) -> anyhow::Result<()> {
+    fn cmd(&mut self, cmd: &[&str], backplane: &Backplane) -> anyhow::Result<()> {
         if cmd[0] == "debug" && cmd.len() >= 2 {
             self.print_debug = cmd[1].parse()?;
         }
diff --git a/src/rom.rs b/src/rom.rs
index ee739ea..6002c7d 100644
--- a/src/rom.rs
+++ b/src/rom.rs
@@ -7,9 +7,7 @@ use serde::Deserialize;
 use toml::Value;
 
 use crate::{
-    card::{u16_get_be_byte, u16_set_be_byte, Card},
-    m68k::BusError,
-    register,
+    backplane::{self, Backplane}, card::{u16_get_be_byte, u16_set_be_byte, Card}, m68k::BusError, register
 };
 
 const ID: u16 = 1;
@@ -99,7 +97,7 @@ impl Card for Rom {
         NullableResult::Ok(())
     }
 
-    fn cmd(&mut self, cmd: &[&str]) -> anyhow::Result<()> {
+    fn cmd(&mut self, cmd: &[&str], _backplane: &Backplane) -> anyhow::Result<()> {
         if cmd[0] == "load" && cmd.len() >= 2 {
             let mut file = File::open(cmd[1])
                 .map_err(|e| anyhow!("Couldn't open ROM image file {} ({})", cmd[1], e))?;
diff --git a/src/storage.rs b/src/storage.rs
index e68568c..245c9b8 100644
--- a/src/storage.rs
+++ b/src/storage.rs
@@ -139,7 +139,7 @@ impl Card for Storage {
         NullableResult::Ok(())
     }
 
-    fn cmd(&mut self, cmd: &[&str]) -> anyhow::Result<()> {
+    fn cmd(&mut self, cmd: &[&str], _backplane: &Backplane) -> anyhow::Result<()> {
         if cmd[0] == "load" && cmd.len() >= 2 {
             let file = File::open(cmd[1])
                 .map_err(|e| anyhow!("Couldn't open disk image file {} ({})", cmd[1], e))?;