diff --git a/Makefile-common b/Makefile-common
index 19efb5e..11f4d8b 100644
--- a/Makefile-common
+++ b/Makefile-common
@@ -136,6 +136,9 @@ regressiontests:
 	# The configuration used for performance measurements.
 	$(MAKE) -f Makefile-AVR USER_CONFIG=testcases/config.h.Profiling \
 	  MCU=atmega644 F_CPU=20000000UL EXTRA_CFLAGS=-Werror all
+	# Test for parallel 4-bit bus and HD44780 display using an old Gen7.
+	$(MAKE) -f Makefile-AVR USER_CONFIG=testcases/config.regtest-display.h \
+	  EXTRA_CFLAGS=-Werror all
 	# Continue with ARM based boards, a Gen7-ARM.
 	$(MAKE) -f Makefile-ARM USER_CONFIG=testcases/config.regtest-gen7-arm.h \
 	  EXTRA_CFLAGS=-Werror all
diff --git a/config/board.gen7-v1.1-v1.3.h b/config/board.gen7-v1.1-v1.3.h
index dc29e2f..4d68a8d 100644
--- a/config/board.gen7-v1.1-v1.3.h
+++ b/config/board.gen7-v1.1-v1.3.h
@@ -293,7 +293,7 @@ DEFINE_HEATER(bed,      DIO3,    0,      1)
   Comment in the one in use, comment out all others. If there is no display,
   comment out all of them to remove display code for better performance.
 */
-//#define DISPLAY_BUS_4BIT
+#define DISPLAY_BUS_4BIT
 //#define DISPLAY_BUS_8BIT
 //#define DISPLAY_BUS_I2C
 //#define DISPLAY_BUS_SPI
@@ -304,13 +304,13 @@ DEFINE_HEATER(bed,      DIO3,    0,      1)
   Pins necessary for the 4-bit parallel display bus. Taken into account with
   DISPLAY_BUS_4BIT defined, only.
 */
-//#define DISPLAY_RS_PIN           xxxx
-//#define DISPLAY_RW_PIN           xxxx
-//#define DISPLAY_E_PIN            xxxx
-//#define DISPLAY_D4_PIN           xxxx
-//#define DISPLAY_D5_PIN           xxxx
-//#define DISPLAY_D6_PIN           xxxx
-//#define DISPLAY_D7_PIN           xxxx
+#define DISPLAY_RS_PIN           PC1
+#define DISPLAY_RW_PIN           PC0
+#define DISPLAY_E_PIN            PD2
+#define DISPLAY_D4_PIN           PD3
+#define DISPLAY_D5_PIN           PD4
+#define DISPLAY_D6_PIN           PD5
+#define DISPLAY_D7_PIN           PD6
 
 /** \def DISPLAY_TYPE_SSD1306 DISPLAY_TYPE_HD44780
 
@@ -321,4 +321,4 @@ DEFINE_HEATER(bed,      DIO3,    0,      1)
   display, comment out all of DISPLAY_BUS_xxx.
 */
 //#define DISPLAY_TYPE_SSD1306
-//#define DISPLAY_TYPE_HD44780
+#define DISPLAY_TYPE_HD44780
diff --git a/testcases/config.regtest-display.h b/testcases/config.regtest-display.h
new file mode 100644
index 0000000..15c5e1a
--- /dev/null
+++ b/testcases/config.regtest-display.h
@@ -0,0 +1,6 @@
+
+// Configuration for controller board.
+#include "../config/board.gen7-v1.1-v1.3.h"
+
+// Configuration for printer board.
+#include "../config/printer.wolfstrap.h"