diff --git a/coco/src/fn_fuji/fuji_copy_file.c b/coco/src/fn_fuji/fuji_copy_file.c
index 322cad4..06d5031 100644
--- a/coco/src/fn_fuji/fuji_copy_file.c
+++ b/coco/src/fn_fuji/fuji_copy_file.c
@@ -6,6 +6,24 @@
 
 bool fuji_copy_file(uint8_t src_slot, uint8_t dst_slot, char *copy_spec)
 {
-    // TODO: Implement in firmware.
-    return BUS_ERROR;
+    struct _cf
+    {
+        uint8_t opcode;
+        uint8_t cmd;
+        uint8_t src_slot;
+        uint8_t dst_slot;
+        char copy_spec[256];
+    } cf;
+
+    cf.opcode = OP_FUJI;
+    cf.cmd = FUJICMD_COPY_FILE;
+    cf.src_slot = src_slot;
+    cf.dst_slot = dst_slot;
+    strcpy(cf.copy_spec, copy_spec);
+    
+    bus_ready();
+
+    dwwrite((uint8_t *)&cf, sizeof(cf));
+
+    return !fuji_get_error();
 }