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diff --git a/circuitpython/shared-bindings/multiterminal/__init__.c b/circuitpython/shared-bindings/multiterminal/__init__.c
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+++ b/circuitpython/shared-bindings/multiterminal/__init__.c
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+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "shared-bindings/multiterminal/__init__.h"
+
+#include "py/obj.h"
+#include "py/mphal.h"
+#include "py/runtime.h"
+#include "supervisor/shared/translate.h"
+
+//| """Manage additional terminal sources
+//|
+//| The `multiterminal` module allows you to configure an additional serial
+//| terminal source. Incoming characters are accepted from both the internal
+//| serial connection and the optional secondary connection."""
+//|
+
+//| def get_secondary_terminal() -> Optional[typing.BinaryIO]:
+//|     """Returns the current secondary terminal."""
+//|     ...
+//|
+STATIC mp_obj_t multiterminal_obj_get_secondary_terminal() {
+    return common_hal_multiterminal_get_secondary_terminal();
+}
+MP_DEFINE_CONST_FUN_OBJ_0(multiterminal_get_secondary_terminal_obj, multiterminal_obj_get_secondary_terminal);
+
+//| def set_secondary_terminal(stream: typing.BinaryIO) -> None:
+//|     """Read additional input from the given stream and write out back to it.
+//|     This doesn't replace the core stream (usually UART or native USB) but is
+//|     mixed in instead.
+//|
+//|     :param stream stream: secondary stream"""
+//|     ...
+//|
+STATIC mp_obj_t multiterminal_obj_set_secondary_terminal(mp_obj_t secondary_terminal) {
+    mp_obj_t write_m[3];
+    mp_load_method_maybe(secondary_terminal, MP_QSTR_write, write_m);
+    mp_obj_t readinto_m[3];
+    mp_load_method_maybe(secondary_terminal, MP_QSTR_readinto, readinto_m);
+    if (write_m[0] == MP_OBJ_NULL || readinto_m[0] == MP_OBJ_NULL) {
+        mp_raise_ValueError(translate("Stream missing readinto() or write() method."));
+        return mp_const_none;
+    }
+    common_hal_multiterminal_set_secondary_terminal(secondary_terminal);
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_1(multiterminal_set_secondary_terminal_obj, multiterminal_obj_set_secondary_terminal);
+
+//| def clear_secondary_terminal() -> None:
+//|     """Clears the secondary terminal."""
+//|     ...
+//|
+STATIC mp_obj_t multiterminal_obj_clear_secondary_terminal() {
+    common_hal_multiterminal_clear_secondary_terminal();
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_0(multiterminal_clear_secondary_terminal_obj, multiterminal_obj_clear_secondary_terminal);
+
+//| def schedule_secondary_terminal_read(socket: socket.socket) -> None:
+//|     """In cases where the underlying OS is doing task scheduling, this notifies
+//|     the OS when more data is available on the socket to read. This is useful
+//|     as a callback for lwip sockets."""
+//|     ...
+//|
+// TODO(tannewt): This is a funny API. Replace it with a direct call into the OS
+// by the lwip object.
+STATIC mp_obj_t multiterminal_obj_schedule_secondary_terminal_read(mp_obj_t socket) {
+    common_hal_multiterminal_schedule_secondary_terminal_read(socket);
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_1(multiterminal_schedule_secondary_terminal_read_obj, multiterminal_obj_schedule_secondary_terminal_read);
+
+// TODO(tannewt): Expose the internal serial connection as `primary_terminal`
+
+STATIC const mp_rom_map_elem_t multiterminal_module_globals_table[] = {
+    { MP_ROM_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(MP_QSTR_multiterminal) },
+    { MP_ROM_QSTR(MP_QSTR_get_secondary_terminal), MP_ROM_PTR(&multiterminal_get_secondary_terminal_obj) },
+    { MP_ROM_QSTR(MP_QSTR_set_secondary_terminal), MP_ROM_PTR(&multiterminal_set_secondary_terminal_obj) },
+    { MP_ROM_QSTR(MP_QSTR_clear_secondary_terminal), MP_ROM_PTR(&multiterminal_clear_secondary_terminal_obj) },
+    { MP_ROM_QSTR(MP_QSTR_schedule_secondary_terminal_read), MP_ROM_PTR(&multiterminal_schedule_secondary_terminal_read_obj) },
+};
+
+STATIC MP_DEFINE_CONST_DICT(multiterminal_module_globals, multiterminal_module_globals_table);
+
+const mp_obj_module_t multiterminal_module = {
+    .base = { &mp_type_module },
+    .globals = (mp_obj_dict_t *)&multiterminal_module_globals,
+};