diff --git a/tests/production_tests/main.py b/tests/production_tests/main.py
new file mode 100644
index 0000000000..34d86c3d10
--- /dev/null
+++ b/tests/production_tests/main.py
@@ -0,0 +1,154 @@
+import utime
+
+from trezor import io
+from trezor import ui
+
+usb_vcp = io.VCP(
+    iface_num=0x00,
+    data_iface_num=0x01,
+    ep_in=0x81,
+    ep_out=0x01,
+    ep_cmd=0x82,
+)
+
+usb = io.USB(
+    vendor_id=0x1209,
+    product_id=0x53C1,
+    release_num=0x0002,
+    manufacturer="SatoshiLabs",
+    product="TREZOR",
+    serial_number="000000000000000000000000",
+)
+
+usb.add(usb_vcp)
+
+usb.open()
+
+d = ui.display
+sd = io.SDCard()
+sbu = io.SBU()
+
+
+def test_display(colors):
+    d.clear()
+    m = {
+        'R': 0xF800,
+        'G': 0x07E0,
+        'B': 0x001F,
+        'W': 0xFFFF,
+    }
+    w = 240 // len(colors)
+    for i, c in enumerate(colors):
+        c = m.get(c, 0x0000)
+        d.bar(i * w, 0, i * w + w, 240, c)
+    d.refresh()
+    print('OK')
+
+
+def test_touch(v):
+    d.clear()
+    c, t = int(v[0]), int(v[1])
+    deadline = utime.ticks_add(utime.ticks_us(), t * 1000000)
+    if c == 1:
+        d.bar(0, 0, 120, 120, 0xFFFF)
+    elif c == 2:
+        d.bar(120, 0, 120, 120, 0xFFFF)
+    elif c == 3:
+        d.bar(120, 120, 120, 120, 0xFFFF)
+    else:
+        d.bar(0, 120, 120, 120, 0xFFFF)
+    d.refresh()
+    r = [0, 0]
+    # flush all events
+    while io.poll([io.TOUCH], r, 10000):
+        pass
+    # wait for event
+    while True:
+        if io.poll([io.TOUCH], r, 10000) and r[0] == io.TOUCH and r[1][0] == io.TOUCH_END:
+            print('OK %d %d' % (r[1][1], r[1][2]))
+            break
+        if utime.ticks_us() > deadline:
+            print('ERROR TIMEOUT')
+            break
+    # flush all events
+    while io.poll([io.TOUCH], r, 10000):
+        pass
+    d.clear()
+    d.refresh()
+
+
+def test_pwm(v):
+    d.backlight(int(v))
+    d.refresh()
+    print('OK')
+
+
+def test_sd():
+    if sd.present():
+        sd.power(True)
+        buf1 = bytearray(8 * 1024)
+        sd.read(0, buf1)
+        sd.write(0, buf1)
+        buf2 = bytearray(8 * 1024)
+        sd.read(0, buf2)
+        if buf1 == buf2:
+            print('OK')
+        else:
+            print('ERROR DATA MISMATCH')
+        sd.power(False)
+    else:
+        print('ERROR NOCARD')
+
+
+def test_sbu(v):
+    sbu1 = (v[0] == '1')
+    sbu2 = (v[1] == '1')
+    sbu.set(sbu1, sbu2)
+    print('OK')
+
+
+def test_otp_read(v):
+    # FIXME: really read
+    otp = '00000'
+    print('OK', otp)
+
+
+def test_otp_write(v):
+    # FIXME: really write
+    print('OK')
+
+
+while True:
+
+    try:
+        line = input()
+
+        if line == 'PING':
+            print('OK')
+
+        elif line.startswith('DISP '):
+            test_display(line[5:])
+
+        elif line.startswith('TOUCH '):
+            test_touch(line[6:])
+
+        elif line.startswith('PWM '):
+            test_pwm(line[4:])
+
+        elif line == 'SD':
+            test_sd()
+
+        elif line.startswith('SBU '):
+            test_sbu(line[4:])
+
+        elif line.startswith('OTP READ'):
+            test_otp_read(line[8:])
+
+        elif line.startswith('OTP WRITE '):
+            test_otp_write(line[10:])
+
+        else:
+            print('UNKNOWN')
+
+    except Exception as ex:
+        print('ERROR', ex)