diff --git a/n-link-core/components/CalcInfo.vue b/n-link-core/components/CalcInfo.vue
index f30684a..898cc86 100644
--- a/n-link-core/components/CalcInfo.vue
+++ b/n-link-core/components/CalcInfo.vue
@@ -36,6 +36,10 @@
     </button>
     <input v-if="nativeUpload" ref="upload" type="file" class="hidden" :accept="info.os_extension"
            @change="uploadNative"/>
+    <button class="mt-4 button gray-button"
+            @click="copyLogs">
+      Copy logs
+    </button>
   </div>
 </template>
 
@@ -73,6 +77,10 @@ export default class FileView extends Vue {
     const file = e.target.files?.[0];
     if (file) this.$devices.uploadOsFile(this.dev, file);
   }
+
+  copyLogs() {
+    navigator.clipboard.writeText(this.$devices.devices[this.dev].log).catch(alert);
+  }
 }
 </script>
 
diff --git a/web/components/devices.ts b/web/components/devices.ts
index 21bbeba..3773f0e 100644
--- a/web/components/devices.ts
+++ b/web/components/devices.ts
@@ -11,8 +11,6 @@ const PID = 0xe012;
 /// The USB vendor ID used by all CX II calculators.
 const PID_CX2 = 0xe022;
 
-async function promisified(...a: any[]): Promise<any> {
-}
 
 type WorkerExt = Worker & { rpc: RpcProvider };
 export type Device = {
@@ -25,6 +23,7 @@ export type Device = {
   progress?: Progress;
   queue?: Cmd[];
   running?: boolean;
+  log: string;
 };
 
 async function downloadFile(
@@ -178,6 +177,7 @@ class Devices extends Vue implements GenericDevices {
         name: device.productName,
         isCxIi: device.productId === PID_CX2,
         needsDrivers: false,
+        log: '',
       } as Device);
     } catch (e) {
       console.error(e);
@@ -189,7 +189,10 @@ class Devices extends Vue implements GenericDevices {
     await device.open();
     const worker: Worker & Partial<WorkerExt> = new UsbWorker();
     const sab = new SharedArrayBuffer(10000);
-    const compat = new UsbCompat(sab);
+    const writeMessage = (messages: any[]) => {
+      this.devices[dev].log += messages.map(message => ['string', 'number'].includes(typeof message) ? message : JSON.stringify(message)).join(' ') + '\n';
+    };
+    const compat = new UsbCompat(sab, writeMessage);
     const id = compat.addDevice(device);
     const rpc = new RpcProvider((message, transfer: any) =>
       worker.postMessage(message, transfer)
@@ -203,6 +206,10 @@ class Devices extends Vue implements GenericDevices {
       }
       rpc.dispatch(data);
     };
+    rpc.registerSignalHandler('log', (messages: any[]) => {
+      console.log(messages.join(' '));
+      writeMessage(messages);
+    });
     this.$set(this.devices[dev], 'worker', worker as WorkerExt);
 
     await rpc.rpc('init', {id, sab, vid: device.vendorId, pid: device.productId});
diff --git a/web/components/impl.ts b/web/components/impl.ts
index 97dd7a3..9f7e1ab 100644
--- a/web/components/impl.ts
+++ b/web/components/impl.ts
@@ -85,9 +85,11 @@ let count = 0;
 export default class UsbCompat {
   devices: Record<number, USBDevice> = {};
   arr: SharedArrayBuffer;
+  log: (data: any[]) => void;
 
-  constructor(arr: SharedArrayBuffer) {
+  constructor(arr: SharedArrayBuffer, log: (data: any[]) => void) {
     this.arr = arr;
+    this.log = log;
   }
 
   addDevice(dev: USBDevice) {
@@ -154,8 +156,10 @@ export default class UsbCompat {
   }
 
   async processCmd(cmd: Cmd) {
+    this.log(['in:', cmd]);
     console.log(cmd);
     const msg = await this._processCmd(cmd);
+    this.log(['out:', msg]);
     console.log(msg);
     const encoded = encoder.encode(msg);
 
diff --git a/web/components/usb.worker.ts b/web/components/usb.worker.ts
index 24fe9ca..e9f5017 100644
--- a/web/components/usb.worker.ts
+++ b/web/components/usb.worker.ts
@@ -4,7 +4,6 @@ import { RpcProvider } from 'worker-rpc';
 // eslint-disable-next-line import/no-absolute-path
 import type { Calculator } from 'web-libnspire';
 
-console.log('worker!');
 const ctx: Worker = self as any;
 const module = import('@/web-libusb/web-libnspire/pkg');
 let calc: Calculator | undefined;
@@ -13,6 +12,13 @@ const rpcProvider = new RpcProvider((message, transfer: any) =>
 );
 ctx.onmessage = (e) => rpcProvider.dispatch(e.data);
 
+const origLog = console.log;
+console.log = (...args: any[]) => {
+  origLog(...args);
+  rpcProvider.signal('log', args);
+};
+
+console.log('worker!');
 type Path = { path: string };
 type Data = { data: Uint8Array };
 type SrcDest = { src: string; dest: string };