diff --git a/Cargo.toml b/Cargo.toml
index c1a939e..6c17652 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,6 +9,7 @@ members = [
 nursery = { level = "deny", priority = -1 }
 
 cast_possible_truncation = "allow"
+cognitive_complexity = "allow"
 doc_markdown = "allow"
 option_if_let_else = "allow"
 missing_const_for_fn = "allow"
diff --git a/core/src/mac/bus.rs b/core/src/mac/bus.rs
index 48feef1..33ccdb8 100644
--- a/core/src/mac/bus.rs
+++ b/core/src/mac/bus.rs
@@ -97,7 +97,7 @@ where
         let sound_alt_start = ram_size - Self::SOUND_ALT_OFFSET;
         let sound_main_start = ram_size - Self::SOUND_MAIN_OFFSET;
 
-        Self {
+        let mut bus = Self {
             cycles: 0,
             model,
             trace: false,
@@ -128,7 +128,15 @@ where
             scsi_enable: true,
             speed: EmulatorSpeed::Accurate,
             last_audiosample: 0,
+        };
+
+        // Disable memory test
+        if let Some((addr, value)) = model.disable_memtest() {
+            info!("Skipping memory test");
+            bus.write_ram(addr, value);
         }
+
+        bus
     }
 
     pub(crate) fn get_audio_channel(&self) -> AudioReceiver {
diff --git a/core/src/mac/mod.rs b/core/src/mac/mod.rs
index 2093250..a023e60 100644
--- a/core/src/mac/mod.rs
+++ b/core/src/mac/mod.rs
@@ -1,6 +1,6 @@
 use std::fmt::Display;
 
-use crate::{keymap::Keymap, tickable::Ticks};
+use crate::{bus::Address, keymap::Keymap, tickable::Ticks};
 
 pub mod adb;
 pub mod audio;
@@ -83,6 +83,14 @@ impl MacModel {
             Self::SE | Self::Classic => cycles % 16 >= 4,
         }
     }
+
+    pub const fn disable_memtest(self) -> Option<(Address, u32)> {
+        match self {
+            Self::Early128K | Self::Early512K => None,
+            Self::Plus => Some((0x0002AE, 0x0040_0000)),
+            Self::SE | Self::Classic => Some((0x000CFC, 0x574C5343)),
+        }
+    }
 }
 
 impl Display for MacModel {