diff --git a/tools/splitreplica.js b/tools/splitreplica.js
new file mode 100644
index 0000000..b9c4090
--- /dev/null
+++ b/tools/splitreplica.js
@@ -0,0 +1,19 @@
+const fs = require('fs');
+
+//let bin = fs.readFileSync("replica1-firmware.double-ROM.bin");
+let bin = fs.readFileSync("replica1-firmware.double-ROM.modded.bin");
+
+let rom1 = new Uint8Array(bin.slice(0, 0x2000));
+let rom2 = new Uint8Array(bin.slice(0x2000, 0x4000));
+
+//fs.writeFileSync("replica.rom1.e000.bin", rom1);
+//fs.writeFileSync("replica.rom2.e000.bin", rom2);
+
+fs.writeFileSync("replica.rom1.e000.modded.bin", rom1);
+fs.writeFileSync("replica.rom2.e000.modded.bin", rom2);
+
+console.log(`written`);
+
+
+
+