diff --git a/wasp/boards/simulator/display.py b/wasp/boards/simulator/display.py
index 8efbb9c..379760c 100644
--- a/wasp/boards/simulator/display.py
+++ b/wasp/boards/simulator/display.py
@@ -37,6 +37,11 @@ class ST7789Sim(object):
         self.cmd = 0
 
     def write(self, data):
+        # Converting data to a memoryview ensures we act more like spi.write()
+        # when running in a real device (e.g. data must be  bytes-like object
+        # that implements the buffer protocol)
+        data = memoryview(data)
+
         if len(data) == 1:
             # Assume if we get a byte at a time then it is command.
             # This is a simplification do we don't have to track
diff --git a/wasp/drivers/st7789.py b/wasp/drivers/st7789.py
index 013ee1b..be4b109 100644
--- a/wasp/drivers/st7789.py
+++ b/wasp/drivers/st7789.py
@@ -181,8 +181,8 @@ class ST7789_SPI(ST7789):
 
         Send data to the display as part of an optimized write sequence.
 
-        :param bytearray buf: Data, must be in a form that can be directly
-                              consumed by the SPI bus.
+        :param bytes-like buf: Data, must be in a form that can be directly
+                               consumed by the SPI bus.
     """
     def __init__(self, width, height, spi, cs, dc, res=None, rate=8000000):
         """Configure the display.