--- a/config.h.in	Sat Nov 28 21:00:29 2015 +0100
+++ b/config.h.in	Wed Dec 02 17:16:41 2015 +0100
@@ -11,6 +11,8 @@
 #define SLCD_MCLEAR     0x1fff
 #define SLCD_HOME       0x0002
 #define SLCD_MHOME      0x1ffe
+#define	SLCD_CGRAM	0x0040
+#define	SLCD_MCGRAM	0x1fc0
 #define SLCD_DGRAM      0x0080
 #define SLCD_MDGRAM     0x1f80
 #define SLCD_DATA       0x0200