diff --git a/ports/atmel-samd/boards/arduino_mkr1300/pins.c b/ports/atmel-samd/boards/arduino_mkr1300/pins.c
index de9f9769c8..a5a058acec 100644
--- a/ports/atmel-samd/boards/arduino_mkr1300/pins.c
+++ b/ports/atmel-samd/boards/arduino_mkr1300/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA02) },
diff --git a/ports/atmel-samd/boards/arduino_mkrzero/pins.c b/ports/atmel-samd/boards/arduino_mkrzero/pins.c
index 3ffd37fa6e..654c0d6dae 100644
--- a/ports/atmel-samd/boards/arduino_mkrzero/pins.c
+++ b/ports/atmel-samd/boards/arduino_mkrzero/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA02) },
@@ -31,7 +31,7 @@ STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_D13), MP_ROM_PTR(&pin_PB23) },
     { MP_ROM_QSTR(MP_QSTR_RX), MP_ROM_PTR(&pin_PB23) },
     { MP_ROM_QSTR(MP_QSTR_D14), MP_ROM_PTR(&pin_PB22) },
-    { MP_ROM_QSTR(MP_QSTR_TX), MP_ROM_PTR(&pin_PB22) },    
+    { MP_ROM_QSTR(MP_QSTR_TX), MP_ROM_PTR(&pin_PB22) },
     { MP_ROM_QSTR(MP_QSTR_SD_SCK), MP_ROM_PTR(&pin_PA13) },
     { MP_ROM_QSTR(MP_QSTR_SD_MOSI), MP_ROM_PTR(&pin_PA12) },
     { MP_ROM_QSTR(MP_QSTR_SD_MISO), MP_ROM_PTR(&pin_PA15) },
diff --git a/ports/atmel-samd/boards/arduino_zero/pins.c b/ports/atmel-samd/boards/arduino_zero/pins.c
index 8a7ff70e6d..f9403bb9ad 100644
--- a/ports/atmel-samd/boards/arduino_zero/pins.c
+++ b/ports/atmel-samd/boards/arduino_zero/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA02) },
diff --git a/ports/atmel-samd/boards/catwan_usbstick/pins.c b/ports/atmel-samd/boards/catwan_usbstick/pins.c
index 8997b653ff..87ee84c0be 100644
--- a/ports/atmel-samd/boards/catwan_usbstick/pins.c
+++ b/ports/atmel-samd/boards/catwan_usbstick/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_D0), MP_ROM_PTR(&pin_PA30) },
diff --git a/ports/atmel-samd/boards/circuitplayground_express/pins.c b/ports/atmel-samd/boards/circuitplayground_express/pins.c
index 14ae89c55e..70743366ed 100644
--- a/ports/atmel-samd/boards/circuitplayground_express/pins.c
+++ b/ports/atmel-samd/boards/circuitplayground_express/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA02) },
diff --git a/ports/atmel-samd/boards/circuitplayground_express_crickit/pins.c b/ports/atmel-samd/boards/circuitplayground_express_crickit/pins.c
index 14ae89c55e..70743366ed 100644
--- a/ports/atmel-samd/boards/circuitplayground_express_crickit/pins.c
+++ b/ports/atmel-samd/boards/circuitplayground_express_crickit/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA02) },
diff --git a/ports/atmel-samd/boards/cp32-m4/pins.c b/ports/atmel-samd/boards/cp32-m4/pins.c
index 93c169c8b5..9da67dfb44 100644
--- a/ports/atmel-samd/boards/cp32-m4/pins.c
+++ b/ports/atmel-samd/boards/cp32-m4/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 // This mapping only includes functional names because pins broken
 // out on connectors are labeled with their MCU name available from
diff --git a/ports/atmel-samd/boards/datalore_ip_m4/pins.c b/ports/atmel-samd/boards/datalore_ip_m4/pins.c
index 460fd6fefa..468a09a476 100644
--- a/ports/atmel-samd/boards/datalore_ip_m4/pins.c
+++ b/ports/atmel-samd/boards/datalore_ip_m4/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 // This mapping only includes functional names because pins broken
 // out on connectors are labeled with their MCU name available from
diff --git a/ports/atmel-samd/boards/feather_m0_adalogger/pins.c b/ports/atmel-samd/boards/feather_m0_adalogger/pins.c
index 0029bba1a3..d99e62c955 100644
--- a/ports/atmel-samd/boards/feather_m0_adalogger/pins.c
+++ b/ports/atmel-samd/boards/feather_m0_adalogger/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA02) },
diff --git a/ports/atmel-samd/boards/feather_m0_basic/pins.c b/ports/atmel-samd/boards/feather_m0_basic/pins.c
index 4400a253da..f9b6db63be 100644
--- a/ports/atmel-samd/boards/feather_m0_basic/pins.c
+++ b/ports/atmel-samd/boards/feather_m0_basic/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA02) },
diff --git a/ports/atmel-samd/boards/feather_m0_express/pins.c b/ports/atmel-samd/boards/feather_m0_express/pins.c
index cd6c351d49..1eaa98a586 100644
--- a/ports/atmel-samd/boards/feather_m0_express/pins.c
+++ b/ports/atmel-samd/boards/feather_m0_express/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA02) },
diff --git a/ports/atmel-samd/boards/feather_m0_express_crickit/pins.c b/ports/atmel-samd/boards/feather_m0_express_crickit/pins.c
index cd6c351d49..1eaa98a586 100644
--- a/ports/atmel-samd/boards/feather_m0_express_crickit/pins.c
+++ b/ports/atmel-samd/boards/feather_m0_express_crickit/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA02) },
diff --git a/ports/atmel-samd/boards/feather_m0_rfm69/pins.c b/ports/atmel-samd/boards/feather_m0_rfm69/pins.c
index 7e14b3f251..ba59cb69b6 100644
--- a/ports/atmel-samd/boards/feather_m0_rfm69/pins.c
+++ b/ports/atmel-samd/boards/feather_m0_rfm69/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA02) },
diff --git a/ports/atmel-samd/boards/feather_m0_rfm9x/pins.c b/ports/atmel-samd/boards/feather_m0_rfm9x/pins.c
index 4e77b7fb97..29a01d4056 100644
--- a/ports/atmel-samd/boards/feather_m0_rfm9x/pins.c
+++ b/ports/atmel-samd/boards/feather_m0_rfm9x/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA02) },
diff --git a/ports/atmel-samd/boards/feather_m0_supersized/pins.c b/ports/atmel-samd/boards/feather_m0_supersized/pins.c
index cd6c351d49..1eaa98a586 100644
--- a/ports/atmel-samd/boards/feather_m0_supersized/pins.c
+++ b/ports/atmel-samd/boards/feather_m0_supersized/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA02) },
diff --git a/ports/atmel-samd/boards/feather_radiofruit_zigbee/pins.c b/ports/atmel-samd/boards/feather_radiofruit_zigbee/pins.c
index cd111e1745..211596f786 100755
--- a/ports/atmel-samd/boards/feather_radiofruit_zigbee/pins.c
+++ b/ports/atmel-samd/boards/feather_radiofruit_zigbee/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PB02) },
diff --git a/ports/atmel-samd/boards/gemma_m0/pins.c b/ports/atmel-samd/boards/gemma_m0/pins.c
index c9c7ea555b..b24b458388 100644
--- a/ports/atmel-samd/boards/gemma_m0/pins.c
+++ b/ports/atmel-samd/boards/gemma_m0/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_A1),  MP_ROM_PTR(&pin_PA05) }, // pad 1
diff --git a/ports/atmel-samd/boards/hallowing_m0_express/board.c b/ports/atmel-samd/boards/hallowing_m0_express/board.c
index b47c5fbb22..2b12ae464f 100644
--- a/ports/atmel-samd/boards/hallowing_m0_express/board.c
+++ b/ports/atmel-samd/boards/hallowing_m0_express/board.c
@@ -27,6 +27,7 @@
 #include "boards/board.h"
 
 #include "shared-bindings/displayio/FourWire.h"
+#include "shared-module/displayio/__init__.h"
 #include "shared-module/displayio/mipi_constants.h"
 
 #include "tick.h"
@@ -68,13 +69,18 @@ uint8_t display_init_sequence[] = {
 };
 
 void board_init(void) {
-    board_display_obj.base.type = &displayio_fourwire_type;
-    common_hal_displayio_fourwire_construct(&board_display_obj,
-        &pin_PB23, // Clock
-        &pin_PB22, // Data
+    displayio_fourwire_obj_t* bus = &displays[0].fourwire_bus;
+    bus->base.type = &displayio_fourwire_type;
+    common_hal_displayio_fourwire_construct(bus,
+        board_spi(),
         &pin_PA28, // Command or data
         &pin_PA01, // Chip select
-        &pin_PA27, // Reset
+        &pin_PA27); // Reset
+
+    displayio_display_obj_t* display = &displays[0].display;
+    display->base.type = &displayio_display_type;
+    common_hal_displayio_display_construct(display,
+        bus,
         128, // Width
         128, // Height
         2, // column start
@@ -82,33 +88,9 @@ void board_init(void) {
         16, // Color depth
         MIPI_COMMAND_SET_COLUMN_ADDRESS, // Set column command
         MIPI_COMMAND_SET_PAGE_ADDRESS, // Set row command
-        MIPI_COMMAND_WRITE_MEMORY_START); // Write memory command
-
-    uint32_t i = 0;
-    common_hal_displayio_fourwire_begin_transaction(&board_display_obj);
-    while (i < sizeof(display_init_sequence)) {
-        uint8_t *cmd = display_init_sequence + i;
-        uint8_t data_size = *(cmd + 1);
-        bool delay = (data_size & DELAY) != 0;
-        data_size &= ~DELAY;
-        uint8_t *data = cmd + 2;
-        common_hal_displayio_fourwire_send(&board_display_obj, true, cmd, 1);
-        common_hal_displayio_fourwire_send(&board_display_obj, false, data, data_size);
-        if (delay) {
-            data_size++;
-            uint16_t delay_length_ms = *(cmd + 1 + data_size);
-            if (delay_length_ms == 255) {
-                delay_length_ms = 500;
-            }
-            uint64_t start = ticks_ms;
-            while (ticks_ms - start < delay_length_ms) {}
-        } else {
-            uint64_t start = ticks_ms;
-            while (ticks_ms - start < 10) {}
-        }
-        i += 2 + data_size;
-    }
-    common_hal_displayio_fourwire_end_transaction(&board_display_obj);
+        MIPI_COMMAND_WRITE_MEMORY_START, // Write memory command
+        display_init_sequence,
+        sizeof(display_init_sequence));
 }
 
 bool board_requests_safe_mode(void) {
@@ -116,5 +98,4 @@ bool board_requests_safe_mode(void) {
 }
 
 void reset_board(void) {
-    common_hal_displayio_fourwire_show(&board_display_obj, NULL);
 }
diff --git a/ports/atmel-samd/boards/hallowing_m0_express/pins.c b/ports/atmel-samd/boards/hallowing_m0_express/pins.c
index d1f8609ffa..3db1b17524 100644
--- a/ports/atmel-samd/boards/hallowing_m0_express/pins.c
+++ b/ports/atmel-samd/boards/hallowing_m0_express/pins.c
@@ -1,7 +1,8 @@
 #include "shared-bindings/board/__init__.h"
 
 #include "boards/board.h"
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
+#include "shared-module/displayio/__init__.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA02) },
@@ -62,6 +63,6 @@ STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
 
-    { MP_ROM_QSTR(MP_QSTR_DISPLAY), MP_ROM_PTR(&board_display_obj)}
+    { MP_ROM_QSTR(MP_QSTR_DISPLAY), MP_ROM_PTR(&displays[0].display)}
 };
 MP_DEFINE_CONST_DICT(board_module_globals, board_global_dict_table);
diff --git a/ports/atmel-samd/boards/itsybitsy_m0_express/pins.c b/ports/atmel-samd/boards/itsybitsy_m0_express/pins.c
index 25407bc147..912fba4edc 100644
--- a/ports/atmel-samd/boards/itsybitsy_m0_express/pins.c
+++ b/ports/atmel-samd/boards/itsybitsy_m0_express/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_D0), MP_ROM_PTR(&pin_PA11) },
diff --git a/ports/atmel-samd/boards/itsybitsy_m4_express/pins.c b/ports/atmel-samd/boards/itsybitsy_m4_express/pins.c
index 2a89c3037e..ed91c88ee7 100644
--- a/ports/atmel-samd/boards/itsybitsy_m4_express/pins.c
+++ b/ports/atmel-samd/boards/itsybitsy_m4_express/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 // This mapping only includes functional names because pins broken
 // out on connectors are labeled with their MCU name available from
diff --git a/ports/atmel-samd/boards/meowmeow/pins.c b/ports/atmel-samd/boards/meowmeow/pins.c
index 59c51f4ebf..089baad32e 100644
--- a/ports/atmel-samd/boards/meowmeow/pins.c
+++ b/ports/atmel-samd/boards/meowmeow/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA02) },
diff --git a/ports/atmel-samd/boards/metro_m0_express/pins.c b/ports/atmel-samd/boards/metro_m0_express/pins.c
index 13f0eb0ba2..0707a35819 100644
--- a/ports/atmel-samd/boards/metro_m0_express/pins.c
+++ b/ports/atmel-samd/boards/metro_m0_express/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA02) },
diff --git a/ports/atmel-samd/boards/metro_m4_express/pins.c b/ports/atmel-samd/boards/metro_m4_express/pins.c
index 0e66817f7c..dd419aec67 100644
--- a/ports/atmel-samd/boards/metro_m4_express/pins.c
+++ b/ports/atmel-samd/boards/metro_m4_express/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 // This mapping only includes functional names because pins broken
 // out on connectors are labeled with their MCU name available from
diff --git a/ports/atmel-samd/boards/mini_sam_m4/pins.c b/ports/atmel-samd/boards/mini_sam_m4/pins.c
index 87e2103814..f78fe1bc83 100644
--- a/ports/atmel-samd/boards/mini_sam_m4/pins.c
+++ b/ports/atmel-samd/boards/mini_sam_m4/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 // This mapping only includes functional names because pins broken
 // out on connectors are labeled with their MCU name available from
diff --git a/ports/atmel-samd/boards/pirkey_m0/pins.c b/ports/atmel-samd/boards/pirkey_m0/pins.c
index e08302f140..a6dbcefe3e 100644
--- a/ports/atmel-samd/boards/pirkey_m0/pins.c
+++ b/ports/atmel-samd/boards/pirkey_m0/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_REMOTEIN),   MP_ROM_PTR(&pin_PA28) },
diff --git a/ports/atmel-samd/boards/pyportal/board.c b/ports/atmel-samd/boards/pyportal/board.c
index cf03bb28a2..6e5b37dd2c 100644
--- a/ports/atmel-samd/boards/pyportal/board.c
+++ b/ports/atmel-samd/boards/pyportal/board.c
@@ -64,12 +64,14 @@ uint8_t display_init_sequence[] = {
 };
 
 void board_init(void) {
-    displayio_fourwire_obj_t* bus = &displays[0].fourwire_bus;
-    bus->base.type = &displayio_fourwire_type;
-    common_hal_displayio_fourwire_construct(bus,
-        board_spi(),
-        &pin_PB09, // Command or data
+    displayio_parallelbus_obj_t* bus = &displays[0].parallel_bus;
+    bus->base.type = &displayio_parallelbus_type;
+    common_hal_displayio_parallelbus_construct(bus,
+        &pin_PA16, // Data0
+        &pin_PB05, // Command or data
         &pin_PB06, // Chip select
+        &pin_PB09, // Write
+        &pin_PB04, // Read
         &pin_PA00); // Reset
 
     displayio_display_obj_t* display = &displays[0].display;
diff --git a/ports/atmel-samd/boards/pyportal/pins.c b/ports/atmel-samd/boards/pyportal/pins.c
index 4ddc10e52a..6b1254dfcd 100644
--- a/ports/atmel-samd/boards/pyportal/pins.c
+++ b/ports/atmel-samd/boards/pyportal/pins.c
@@ -1,6 +1,7 @@
 #include "shared-bindings/board/__init__.h"
 
 #include "boards/board.h"
+#include "shared-module/displayio/__init__.h"
 #include "supervisor/shared/board_busses.h"
 
 // This mapping only includes functional names because pins broken
@@ -72,5 +73,7 @@ STATIC const mp_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
     { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
+
+    { MP_ROM_QSTR(MP_QSTR_DISPLAY), MP_ROM_PTR(&displays[0].display) },
 };
 MP_DEFINE_CONST_DICT(board_module_globals, board_global_dict_table);
diff --git a/ports/atmel-samd/boards/sparkfun_samd21_mini/pins.c b/ports/atmel-samd/boards/sparkfun_samd21_mini/pins.c
index abe63d0644..42cd3736b8 100644
--- a/ports/atmel-samd/boards/sparkfun_samd21_mini/pins.c
+++ b/ports/atmel-samd/boards/sparkfun_samd21_mini/pins.c
@@ -1,15 +1,15 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
-    
+
     // Analog pins
     { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PA02) },
     { MP_ROM_QSTR(MP_QSTR_A1), MP_ROM_PTR(&pin_PB08) },
     { MP_ROM_QSTR(MP_QSTR_A2), MP_ROM_PTR(&pin_PB09) },
     { MP_ROM_QSTR(MP_QSTR_A3), MP_ROM_PTR(&pin_PA04) },
-    
+
     // Digital pins
     { MP_ROM_QSTR(MP_QSTR_D0), MP_ROM_PTR(&pin_PA11) },
     { MP_ROM_QSTR(MP_QSTR_D1), MP_ROM_PTR(&pin_PA10) },
@@ -25,16 +25,16 @@ STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_D11), MP_ROM_PTR(&pin_PA16) },
     { MP_ROM_QSTR(MP_QSTR_D12), MP_ROM_PTR(&pin_PA19) },
     { MP_ROM_QSTR(MP_QSTR_D13), MP_ROM_PTR(&pin_PA17) },
-    
+
     // UART pins
-    { MP_ROM_QSTR(MP_QSTR_TX), MP_ROM_PTR(&pin_PA10) },  
+    { MP_ROM_QSTR(MP_QSTR_TX), MP_ROM_PTR(&pin_PA10) },
     { MP_ROM_QSTR(MP_QSTR_RX), MP_ROM_PTR(&pin_PA11) },
-    
+
     // SPI pins
     { MP_ROM_QSTR(MP_QSTR_MOSI), MP_ROM_PTR(&pin_PA16) },
     { MP_ROM_QSTR(MP_QSTR_SCK), MP_ROM_PTR(&pin_PA17) },
     { MP_ROM_QSTR(MP_QSTR_MISO), MP_ROM_PTR(&pin_PA19) },
-    
+
     // I2C pins
     { MP_ROM_QSTR(MP_QSTR_SCL), MP_ROM_PTR(&pin_PA23) },
     { MP_ROM_QSTR(MP_QSTR_SDA), MP_ROM_PTR(&pin_PA22) },
@@ -44,7 +44,7 @@ STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_BLUE_LED),   MP_ROM_PTR(&pin_PA17) },
     { MP_ROM_QSTR(MP_QSTR_GREEN_LED),   MP_ROM_PTR(&pin_PA27) },
     { MP_ROM_QSTR(MP_QSTR_YELLOW_LED),   MP_ROM_PTR(&pin_PB03) },
-    
+
     // Comm objects
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
     { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
diff --git a/ports/atmel-samd/boards/trellis_m4_express/pins.c b/ports/atmel-samd/boards/trellis_m4_express/pins.c
index 9626f525f3..a9f2043185 100644
--- a/ports/atmel-samd/boards/trellis_m4_express/pins.c
+++ b/ports/atmel-samd/boards/trellis_m4_express/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 // This mapping only includes functional names because pins broken
 // out on connectors are labeled with their MCU name available from
diff --git a/ports/atmel-samd/boards/trinket_m0/pins.c b/ports/atmel-samd/boards/trinket_m0/pins.c
index 6330170249..b3637bd5bb 100644
--- a/ports/atmel-samd/boards/trinket_m0/pins.c
+++ b/ports/atmel-samd/boards/trinket_m0/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_D0), MP_ROM_PTR(&pin_PA08) },
diff --git a/ports/atmel-samd/boards/trinket_m0_haxpress/pins.c b/ports/atmel-samd/boards/trinket_m0_haxpress/pins.c
index 6330170249..b3637bd5bb 100644
--- a/ports/atmel-samd/boards/trinket_m0_haxpress/pins.c
+++ b/ports/atmel-samd/boards/trinket_m0_haxpress/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_D0), MP_ROM_PTR(&pin_PA08) },
diff --git a/ports/atmel-samd/boards/ugame10/pins.c b/ports/atmel-samd/boards/ugame10/pins.c
index 87ace5e96f..71db52752f 100644
--- a/ports/atmel-samd/boards/ugame10/pins.c
+++ b/ports/atmel-samd/boards/ugame10/pins.c
@@ -1,6 +1,6 @@
 #include "shared-bindings/board/__init__.h"
 
-#include "board_busses.h"
+#include "supervisor/shared/board_busses.h"
 
 STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_X), MP_ROM_PTR(&pin_PA00) },
diff --git a/ports/atmel-samd/common-hal/displayio/ParallelBus.c b/ports/atmel-samd/common-hal/displayio/ParallelBus.c
index f852647a4b..3c287eccd6 100644
--- a/ports/atmel-samd/common-hal/displayio/ParallelBus.c
+++ b/ports/atmel-samd/common-hal/displayio/ParallelBus.c
@@ -35,8 +35,8 @@
 #include "tick.h"
 
 void common_hal_displayio_parallelbus_construct(displayio_parallelbus_obj_t* self,
-    const mcu_pin_obj_t* data0, const mcu_pin_obj_t* command,
-    const mcu_pin_obj_t* chip_select, const mcu_pin_obj_t* reset, const mcu_pin_obj_t* write) {
+    const mcu_pin_obj_t* data0, const mcu_pin_obj_t* command, const mcu_pin_obj_t* chip_select,
+    const mcu_pin_obj_t* write, const mcu_pin_obj_t* read, const mcu_pin_obj_t* reset) {
 
     uint8_t data_pin = data0->number;
     if (data_pin % 8 != 0 || data_pin % 32 >= 24) {
@@ -47,8 +47,8 @@ void common_hal_displayio_parallelbus_construct(displayio_parallelbus_obj_t* sel
             mp_raise_ValueError_varg(translate("Bus pin %d is already in use"), i);
         }
     }
-    PortGroup *const g = &PORT->Group[data0->number % 32];
-    g->DIRSET.reg = 0xff << data_pin;
+    PortGroup *const g = &PORT->Group[data0->number / 32];
+    g->DIRSET.reg = 0xff << (data_pin % 32);
     self->bus = ((uint8_t*) &g->OUT.reg) + (data0->number % 32 / 8);
 
     self->command.base.type = &digitalio_digitalinout_type;
@@ -67,15 +67,36 @@ void common_hal_displayio_parallelbus_construct(displayio_parallelbus_obj_t* sel
     common_hal_digitalio_digitalinout_construct(&self->write, write);
     common_hal_digitalio_digitalinout_switch_to_output(&self->write, true, DRIVE_MODE_PUSH_PULL);
 
+    self->read.base.type = &digitalio_digitalinout_type;
+    common_hal_digitalio_digitalinout_construct(&self->read, read);
+    common_hal_digitalio_digitalinout_switch_to_output(&self->read, true, DRIVE_MODE_PUSH_PULL);
+
+    self->data0_pin = data_pin;
+    self->write_group = &PORT->Group[write->number / 32];
+    self->write_mask = 1 << (write->number % 32);
+
     never_reset_pin_number(command->number);
     never_reset_pin_number(chip_select->number);
-    never_reset_pin_number(reset->number);
     never_reset_pin_number(write->number);
+    never_reset_pin_number(read->number);
+    never_reset_pin_number(reset->number);
     for (uint8_t i = 0; i < 8; i++) {
         never_reset_pin_number(data_pin + i);
     }
 }
 
+void common_hal_displayio_parallelbus_deinit(displayio_parallelbus_obj_t* self) {
+    for (uint8_t i = 0; i < 8; i++) {
+        reset_pin_number(self->data0_pin + i);
+    }
+
+    reset_pin_number(self->command.pin->number);
+    reset_pin_number(self->chip_select.pin->number);
+    reset_pin_number(self->write.pin->number);
+    reset_pin_number(self->read.pin->number);
+    reset_pin_number(self->reset.pin->number);
+}
+
 bool common_hal_displayio_parallelbus_begin_transaction(mp_obj_t obj) {
     displayio_parallelbus_obj_t* self = MP_OBJ_TO_PTR(obj);
     common_hal_digitalio_digitalinout_set_value(&self->chip_select, false);
@@ -85,10 +106,13 @@ bool common_hal_displayio_parallelbus_begin_transaction(mp_obj_t obj) {
 void common_hal_displayio_parallelbus_send(mp_obj_t obj, bool command, uint8_t *data, uint32_t data_length) {
     displayio_parallelbus_obj_t* self = MP_OBJ_TO_PTR(obj);
     common_hal_digitalio_digitalinout_set_value(&self->command, !command);
+    uint32_t* clear_write = (uint32_t*) &self->write_group->OUTCLR.reg;
+    uint32_t* set_write = (uint32_t*) &self->write_group->OUTSET.reg;
+    uint32_t mask = self->write_mask;
     for (uint32_t i = 0; i < data_length; i++) {
-        common_hal_digitalio_digitalinout_set_value(&self->write, false);
+        *clear_write = mask;
         *self->bus = data[i];
-        common_hal_digitalio_digitalinout_set_value(&self->write, true);
+        *set_write = mask;
     }
 }
 
diff --git a/ports/atmel-samd/common-hal/displayio/ParallelBus.h b/ports/atmel-samd/common-hal/displayio/ParallelBus.h
index cc45598c5b..630bec351b 100644
--- a/ports/atmel-samd/common-hal/displayio/ParallelBus.h
+++ b/ports/atmel-samd/common-hal/displayio/ParallelBus.h
@@ -36,6 +36,10 @@ typedef struct {
     digitalio_digitalinout_obj_t chip_select;
     digitalio_digitalinout_obj_t reset;
     digitalio_digitalinout_obj_t write;
+    digitalio_digitalinout_obj_t read;
+    uint8_t data0_pin;
+    PortGroup* write_group;
+    uint32_t write_mask;
 } displayio_parallelbus_obj_t;
 
 #endif // MICROPY_INCLUDED_ATMEL_SAMD_COMMON_HAL_DISPLAYIO_PARALLELBUS_H
diff --git a/ports/atmel-samd/mpconfigport.h b/ports/atmel-samd/mpconfigport.h
index 77881fefd3..a2e4075c45 100644
--- a/ports/atmel-samd/mpconfigport.h
+++ b/ports/atmel-samd/mpconfigport.h
@@ -282,6 +282,7 @@ extern const struct _mp_obj_module_t wiznet_module;
     #endif
 
     #ifdef CIRCUITPY_DISPLAYIO
+    #define CIRCUITPY_DISPLAY_LIMIT (3)
 	#define DISPLAYIO_MODULE { MP_OBJ_NEW_QSTR(MP_QSTR_displayio), (mp_obj_t)&displayio_module },
     #else
 	#define DISPLAYIO_MODULE
diff --git a/shared-bindings/displayio/ParallelBus.c b/shared-bindings/displayio/ParallelBus.c
index dddb4ce8ac..aa861bb81a 100644
--- a/shared-bindings/displayio/ParallelBus.c
+++ b/shared-bindings/displayio/ParallelBus.c
@@ -34,6 +34,7 @@
 #include "py/runtime.h"
 #include "shared-bindings/microcontroller/Pin.h"
 #include "shared-bindings/util.h"
+#include "shared-module/displayio/__init__.h"
 #include "supervisor/shared/translate.h"
 
 //| .. currentmodule:: displayio
@@ -46,13 +47,54 @@
 //|
 //| .. warning:: This will be changed before 4.0.0. Consider it very experimental.
 //|
-//| .. class:: ParallelBus(*, data0, command, chip_select, reset, write, bus_width=8)
+//| .. class:: ParallelBus(*, data0, command, chip_select, write, read, reset)
 //|
-//|   Create a ParallelBus object associated with the given pins.
+//|   Create a ParallelBus object associated with the given pins. The bus is inferred from data0
+//|   by implying the next 7 additional pins on a given GPIO port.
 //|
 STATIC mp_obj_t displayio_parallelbus_make_new(const mp_obj_type_t *type, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
-    mp_raise_NotImplementedError(translate("displayio is a work in progress"));
-    return mp_const_none;
+    enum { ARG_data0, ARG_command, ARG_chip_select, ARG_write, ARG_read, ARG_reset };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_data0, MP_ARG_OBJ | MP_ARG_KW_ONLY, {.u_obj = mp_const_none} },
+        { MP_QSTR_command, MP_ARG_OBJ | MP_ARG_KW_ONLY, {.u_obj = mp_const_none} },
+        { MP_QSTR_chip_select, MP_ARG_OBJ | MP_ARG_KW_ONLY, {.u_obj = mp_const_none} },
+        { MP_QSTR_write, MP_ARG_OBJ | MP_ARG_KW_ONLY, {.u_obj = mp_const_none} },
+        { MP_QSTR_read, MP_ARG_OBJ | MP_ARG_KW_ONLY, {.u_obj = mp_const_none} },
+        { MP_QSTR_reset, MP_ARG_OBJ | MP_ARG_KW_ONLY, {.u_obj = mp_const_none} },
+    };
+    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+    mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+
+    mp_obj_t data0 = args[ARG_data0].u_obj;
+    mp_obj_t command = args[ARG_command].u_obj;
+    mp_obj_t chip_select = args[ARG_chip_select].u_obj;
+    mp_obj_t write = args[ARG_write].u_obj;
+    mp_obj_t read = args[ARG_read].u_obj;
+    mp_obj_t reset = args[ARG_reset].u_obj;
+    if (data0 == mp_const_none || command == mp_const_none || chip_select == mp_const_none || write == mp_const_none || read == mp_const_none) {
+        mp_raise_ValueError(translate("Data0, command, chip_select, write and read required"));
+    }
+    assert_pin_free(data0);
+    assert_pin_free(command);
+    assert_pin_free(chip_select);
+    assert_pin_free(write);
+    assert_pin_free(read);
+    assert_pin_free(reset);
+
+    displayio_parallelbus_obj_t* self = NULL;
+    for (uint8_t i = 0; i < CIRCUITPY_DISPLAY_LIMIT; i++) {
+        if (displays[i].parallel_bus.base.type== NULL) {
+            self = &displays[i].parallel_bus;
+            self->base.type = &displayio_parallelbus_type;
+            break;
+        }
+    }
+    if (self == NULL) {
+        mp_raise_RuntimeError(translate("Display bus limit reached"));
+    }
+
+    common_hal_displayio_parallelbus_construct(self, data0, command, chip_select, write, read, reset);
+    return self;
 }
 
 
diff --git a/shared-bindings/displayio/ParallelBus.h b/shared-bindings/displayio/ParallelBus.h
index c739348389..c4cde5ff53 100644
--- a/shared-bindings/displayio/ParallelBus.h
+++ b/shared-bindings/displayio/ParallelBus.h
@@ -35,8 +35,8 @@
 extern const mp_obj_type_t displayio_parallelbus_type;
 
 void common_hal_displayio_parallelbus_construct(displayio_parallelbus_obj_t* self,
-    const mcu_pin_obj_t* data0, const mcu_pin_obj_t* command,
-    const mcu_pin_obj_t* chip_select, const mcu_pin_obj_t* reset, const mcu_pin_obj_t* write);
+    const mcu_pin_obj_t* data0, const mcu_pin_obj_t* command, const mcu_pin_obj_t* chip_select,
+    const mcu_pin_obj_t* write, const mcu_pin_obj_t* read, const mcu_pin_obj_t* reset);
 
 void common_hal_displayio_parallelbus_deinit(displayio_parallelbus_obj_t* self);
 
diff --git a/shared-bindings/displayio/__init__.c b/shared-bindings/displayio/__init__.c
index 66cf4d63d6..306f8c08bf 100644
--- a/shared-bindings/displayio/__init__.c
+++ b/shared-bindings/displayio/__init__.c
@@ -37,6 +37,7 @@
 #include "shared-bindings/displayio/Group.h"
 #include "shared-bindings/displayio/OnDiskBitmap.h"
 #include "shared-bindings/displayio/Palette.h"
+#include "shared-bindings/displayio/ParallelBus.h"
 #include "shared-bindings/displayio/Shape.h"
 #include "shared-bindings/displayio/Sprite.h"
 
@@ -67,6 +68,7 @@
 //|     Group
 //|     OnDiskBitmap
 //|     Palette
+//|     ParallelBus
 //|     Shape
 //|     Sprite
 //|
@@ -96,6 +98,7 @@ STATIC const mp_rom_map_elem_t displayio_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_Sprite), MP_ROM_PTR(&displayio_sprite_type) },
 
     { MP_ROM_QSTR(MP_QSTR_FourWire), MP_ROM_PTR(&displayio_fourwire_type) },
+    { MP_ROM_QSTR(MP_QSTR_ParallelBus), MP_ROM_PTR(&displayio_parallelbus_type) },
 
     { MP_ROM_QSTR(MP_QSTR_release_displays), MP_ROM_PTR(&displayio_release_displays_obj) },
 };
diff --git a/shared-module/displayio/Display.c b/shared-module/displayio/Display.c
index 0a14e74bb3..f75f0392f7 100644
--- a/shared-module/displayio/Display.c
+++ b/shared-module/displayio/Display.c
@@ -113,10 +113,10 @@ void displayio_display_start_region_update(displayio_display_obj_t* self, uint16
     uint16_t data[2];
     self->send(self->bus, true, &self->set_column_command, 1);
     data[0] = __builtin_bswap16(x0 + self->colstart);
-    data[1] = __builtin_bswap16(x1 + self->colstart);
+    data[1] = __builtin_bswap16(x1 - 1 + self->colstart);
     self->send(self->bus, false, (uint8_t*) data, 4);
     self->send(self->bus, true, &self->set_row_command, 1);
-    data[0] = __builtin_bswap16(y0 + self->rowstart);
+    data[0] = __builtin_bswap16(y0 + 1 + self->rowstart);
     data[1] = __builtin_bswap16(y1 + self->rowstart);
     self->send(self->bus, false, (uint8_t*) data, 4);
     self->send(self->bus, true, &self->write_ram_command, 1);
diff --git a/shared-module/displayio/__init__.c b/shared-module/displayio/__init__.c
index dc5957c232..92d97a6efe 100644
--- a/shared-module/displayio/__init__.c
+++ b/shared-module/displayio/__init__.c
@@ -7,6 +7,7 @@
 #include "shared-bindings/displayio/Group.h"
 #include "shared-bindings/displayio/Palette.h"
 #include "shared-bindings/displayio/Sprite.h"
+#include "supervisor/usb.h"
 
 primary_display_t displays[CIRCUITPY_DISPLAY_LIMIT];
 
@@ -21,8 +22,6 @@ void displayio_refresh_displays(void) {
             return;
         }
         if (displayio_display_refresh_queued(display)) {
-            PORT->Group[1].DIRSET.reg = 1 << 22;
-
             // We compute the pixels
             uint16_t x0 = 0;
             uint16_t y0 = 0;
@@ -38,8 +37,6 @@ void displayio_refresh_displays(void) {
                     uint16_t* pixel = &(((uint16_t*)buffer)[index]);
                     *pixel = 0;
 
-                    PORT->Group[1].OUTTGL.reg = 1 << 22;
-
                     //if (index == 0) {
                         if (display->current_group != NULL) {
                             displayio_group_get_pixel(display->current_group, x, y, pixel);
@@ -48,9 +45,6 @@ void displayio_refresh_displays(void) {
                     //     *pixel = (((uint16_t*)buffer)[0]);
                     // }
 
-
-                    PORT->Group[1].OUTTGL.reg = 1 << 22;
-
                     index += 1;
                     // The buffer is full, send it.
                     if (index >= buffer_size) {
@@ -58,6 +52,9 @@ void displayio_refresh_displays(void) {
                             displayio_display_finish_region_update(display);
                             return;
                         }
+                        // TODO(tannewt): Make refresh displays faster so we don't starve other
+                        // background tasks.
+                        usb_background();
                         index = 0;
                     }
                 }
@@ -182,12 +179,12 @@ void common_hal_displayio_release_displays(void) {
         } else if (bus_type == &displayio_fourwire_type) {
             common_hal_displayio_fourwire_deinit(&displays[i].fourwire_bus);
         } else if (bus_type == &displayio_parallelbus_type) {
-            //common_hal_displayio_parallelbus_deinit(&displays[i].parallel_bus);
+            common_hal_displayio_parallelbus_deinit(&displays[i].parallel_bus);
         }
-        displays[i].fourwire_bus.base.type = NULL;
+        displays[i].fourwire_bus.base.type = &mp_type_NoneType;
     }
     for (uint8_t i = 0; i < CIRCUITPY_DISPLAY_LIMIT; i++) {
-        displays[i].display.base.type = NULL;
+        displays[i].display.base.type = &mp_type_NoneType;
     }
     // TODO(tannewt): Clear the display datastructures and release everything used.
 }