diff --git a/SConscript.boardloader b/SConscript.boardloader
index 786557a37a..6d1289f034 100644
--- a/SConscript.boardloader
+++ b/SConscript.boardloader
@@ -121,7 +121,7 @@ env.Replace(
         'vendor/micropython/lib/cmsis/inc',
     ] + CPPPATH_MOD,
     CPPDEFINES=[
-        'TREZOR_STM32',
+        'TREZOR_MODEL_T',
         'MCU_SERIES_F4',
         'STM32F427xx',
         'USE_HAL_DRIVER',
diff --git a/SConscript.bootloader b/SConscript.bootloader
index 07fe7ef7b6..9ae742d328 100644
--- a/SConscript.bootloader
+++ b/SConscript.bootloader
@@ -143,7 +143,7 @@ env.Replace(
         'vendor/micropython/lib/cmsis/inc',
     ] + CPPPATH_MOD,
     CPPDEFINES=[
-        'TREZOR_STM32',
+        'TREZOR_MODEL_T',
         'MCU_SERIES_F4',
         'STM32F427xx',
         'USE_HAL_DRIVER',
diff --git a/SConscript.firmware b/SConscript.firmware
index 3db755a130..805a983783 100644
--- a/SConscript.firmware
+++ b/SConscript.firmware
@@ -328,7 +328,7 @@ env.Replace(
         'vendor/micropython/ports/stm32',
     ] + CPPPATH_MOD,
     CPPDEFINES=[
-        'TREZOR_STM32',
+        'TREZOR_MODEL_T',
         'MCU_SERIES_F4',
         'STM32F427xx',
         'USE_HAL_DRIVER',
diff --git a/SConscript.prodtest b/SConscript.prodtest
index 161c43e06d..449dec4880 100644
--- a/SConscript.prodtest
+++ b/SConscript.prodtest
@@ -110,7 +110,7 @@ env.Replace(
         'vendor/micropython/ports/stm32',
     ] + CPPPATH_MOD,
     CPPDEFINES=[
-        'TREZOR_STM32',
+        'TREZOR_MODEL_T',
         'MCU_SERIES_F4',
         'STM32F427xx',
         ('STM32_HAL_H', '"<stm32f4xx_hal.h>"'),
diff --git a/SConscript.reflash b/SConscript.reflash
index e81c938da2..57c4acae19 100644
--- a/SConscript.reflash
+++ b/SConscript.reflash
@@ -110,7 +110,7 @@ env.Replace(
         'vendor/micropython/ports/stm32',
     ] + CPPPATH_MOD,
     CPPDEFINES=[
-        'TREZOR_STM32',
+        'TREZOR_MODEL_T',
         'MCU_SERIES_F4',
         'STM32F427xx',
         ('STM32_HAL_H', '"<stm32f4xx_hal.h>"'),
diff --git a/SConscript.unix b/SConscript.unix
index 429c6441ec..6e6a71a326 100644
--- a/SConscript.unix
+++ b/SConscript.unix
@@ -261,7 +261,7 @@ env.Replace(
     ] + CPPPATH_MOD,
     CPPDEFINES=[
         'UNIX',
-        'TREZOR_UNIX',
+        'TREZOR_MODEL_EMU',
         'MICROPY_USE_READLINE',
         ('MP_CONFIGFILE', '\\"embed/unix/mpconfigport.h\\"'),
     ] + CPPDEFINES_MOD,
diff --git a/embed/extmod/modtrezorio/modtrezorio-sdcard.h b/embed/extmod/modtrezorio/modtrezorio-sdcard.h
index d66c666125..635b7853a1 100644
--- a/embed/extmod/modtrezorio/modtrezorio-sdcard.h
+++ b/embed/extmod/modtrezorio/modtrezorio-sdcard.h
@@ -33,7 +33,7 @@ STATIC mp_obj_t mod_trezorio_SDCard_make_new(const mp_obj_type_t *type, size_t n
     mp_arg_check_num(n_args, n_kw, 0, 0, false);
     mp_obj_SDCard_t *o = m_new_obj(mp_obj_SDCard_t);
     o->base.type = type;
-#if defined TREZOR_UNIX
+#if defined TREZOR_MODEL_EMU
     sdcard_init();
 #endif
     return MP_OBJ_FROM_PTR(o);
diff --git a/embed/extmod/modtrezorui/display.c b/embed/extmod/modtrezorui/display.c
index 389d970105..83d5c102d5 100644
--- a/embed/extmod/modtrezorui/display.c
+++ b/embed/extmod/modtrezorui/display.c
@@ -44,9 +44,9 @@ static struct {
     int x, y;
 } DISPLAY_OFFSET;
 
-#if defined TREZOR_STM32
+#if defined TREZOR_MODEL_T
 #include "display-stm32.h"
-#elif defined TREZOR_UNIX
+#elif defined TREZOR_MODEL_EMU
 #include "display-unix.h"
 #else
 #error Unsupported TREZOR port. Only STM32 and UNIX ports are supported.
@@ -385,7 +385,7 @@ void display_print(const char *text, int textlen)
     display_refresh();
 }
 
-#ifdef TREZOR_UNIX
+#ifdef TREZOR_MODEL_EMU
 #define mini_vsnprintf vsnprintf
 #include <stdio.h>
 #else
diff --git a/embed/extmod/modtrezorutils/modtrezorutils.c b/embed/extmod/modtrezorutils/modtrezorutils.c
index a017ba6984..d609c03156 100644
--- a/embed/extmod/modtrezorutils/modtrezorutils.c
+++ b/embed/extmod/modtrezorutils/modtrezorutils.c
@@ -113,7 +113,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_trezorutils_halt_obj, 0, 1, mod_t
 ///     Set unprivileged mode.
 ///     '''
 STATIC mp_obj_t mod_trezorutils_set_mode_unprivileged(void) {
-#if defined TREZOR_STM32
+#if defined TREZOR_MODEL_T
     __asm__ volatile("msr control, %0" :: "r" (0x1));
     __asm__ volatile("isb");
 #endif
@@ -146,6 +146,21 @@ STATIC mp_obj_t mod_trezorutils_symbol(mp_obj_t name) {
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_trezorutils_symbol_obj, mod_trezorutils_symbol);
 
+/// def model() -> str:
+///     '''
+///     Return which hardware model we are running on.
+///     '''
+STATIC mp_obj_t mod_trezorutils_model(void) {
+    const char *model = NULL;
+#if defined TREZOR_MODEL_T
+    model = "T";
+#elif defined TREZOR_MODEL_EMU
+    model = "EMU";
+#endif
+    return model ? mp_obj_new_str(model, strlen(model), false) : mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_0(mod_trezorutils_model_obj, mod_trezorutils_model);
+
 STATIC const mp_rom_map_elem_t mp_module_trezorutils_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_trezorutils) },
     { MP_ROM_QSTR(MP_QSTR_consteq), MP_ROM_PTR(&mod_trezorutils_consteq_obj) },
@@ -153,6 +168,7 @@ STATIC const mp_rom_map_elem_t mp_module_trezorutils_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_halt), MP_ROM_PTR(&mod_trezorutils_halt_obj) },
     { MP_ROM_QSTR(MP_QSTR_set_mode_unprivileged), MP_ROM_PTR(&mod_trezorutils_set_mode_unprivileged_obj) },
     { MP_ROM_QSTR(MP_QSTR_symbol), MP_ROM_PTR(&mod_trezorutils_symbol_obj) },
+    { MP_ROM_QSTR(MP_QSTR_model), MP_ROM_PTR(&mod_trezorutils_model_obj) },
 };
 
 STATIC MP_DEFINE_CONST_DICT(mp_module_trezorutils_globals, mp_module_trezorutils_globals_table);
diff --git a/src/apps/homescreen/__init__.py b/src/apps/homescreen/__init__.py
index 08018d41a2..7cb3fd80b6 100644
--- a/src/apps/homescreen/__init__.py
+++ b/src/apps/homescreen/__init__.py
@@ -1,5 +1,5 @@
 from trezor import config
-from trezor.utils import unimport, symbol
+from trezor.utils import unimport, symbol, model
 from trezor.wire import register, protobuf_workflow
 from trezor.messages import wire_types
 from trezor.messages.Features import Features
@@ -31,7 +31,8 @@ async def respond_Features(ctx, msg):
     f.passphrase_cached = cache.has_passphrase()
     f.needs_backup = storage.needs_backup()
     f.flags = storage.get_flags()
-    f.model = 'T'
+    if model() in ['T', 'EMU']:  # emulator currently emulates model T
+        f.model = 'T'
 
     return f
 
diff --git a/src/trezor/ui/__init__.py b/src/trezor/ui/__init__.py
index dac6ef78fb..eac273cd58 100644
--- a/src/trezor/ui/__init__.py
+++ b/src/trezor/ui/__init__.py
@@ -1,6 +1,5 @@
 from micropython import const
 
-import sys
 import math
 import utime
 
@@ -10,11 +9,12 @@ from trezor import io
 from trezor import loop
 from trezor import res
 from trezor import workflow
+from trezor.utils import model
 
 display = Display()
 
 # for desktop platforms, we need to refresh the display after each frame
-if sys.platform != 'trezor':
+if model() == 'EMU':
     loop.after_step_hook = display.refresh
 
 # import constants from modtrezorui
diff --git a/src/trezor/utils.py b/src/trezor/utils.py
index c6f8701424..ca2eab057e 100644
--- a/src/trezor/utils.py
+++ b/src/trezor/utils.py
@@ -1,7 +1,7 @@
 import sys
 import gc
 
-from trezorutils import halt, memcpy, set_mode_unprivileged, symbol  # noqa: F401
+from trezorutils import halt, memcpy, set_mode_unprivileged, symbol, model  # noqa: F401
 
 
 def unimport(genfunc):
diff --git a/tests/unittest.py b/tests/unittest.py
index c065c36a55..dad094971c 100644
--- a/tests/unittest.py
+++ b/tests/unittest.py
@@ -1,5 +1,6 @@
 from trezor.utils import ensure
 
+
 class SkipTest(Exception):
     pass