diff --git a/ChangeLog b/ChangeLog
index a472e1a..5cac4e3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -16,6 +16,7 @@ v.0.5dev (ongoing development)
  * picolcd: Add OffBrightness (S. Crane), more icons and fix bignum
  * lcdproc: Fix a single dot appearing on line 5 of the D screen
  * lcdproc: Make the iface screen more readable on 2x16 displays
+ * All drivers: sync functions with prototypes
 
 v0.5.4
  * Update driver includes and LDFLAGS (fixed glk and bayrad binding error)
diff --git a/server/drivers/ea65.h b/server/drivers/ea65.h
index 8135452..2ac89c0 100644
--- a/server/drivers/ea65.h
+++ b/server/drivers/ea65.h
@@ -15,7 +15,7 @@ MODULE_EXPORT void EA65_flush (Driver *drvthis);
 MODULE_EXPORT void EA65_string (Driver *drvthis, int x, int y, const char string[]);
 MODULE_EXPORT void EA65_chr (Driver *drvthis, int x, int y, char c);
 
-MODULE_EXPORT void EA65_brightness (Driver *drvthis, int promille);
+MODULE_EXPORT void EA65_backlight (Driver *drvthis, int on);
 MODULE_EXPORT void EA65_output (Driver *drvthis, int on);
 
 #endif
diff --git a/server/drivers/picolcd.h b/server/drivers/picolcd.h
index 24ed7d7..9e5de7e 100644
--- a/server/drivers/picolcd.h
+++ b/server/drivers/picolcd.h
@@ -70,9 +70,11 @@ MODULE_EXPORT void picoLCD_clear(Driver *drvthis);
 MODULE_EXPORT void picoLCD_flush(Driver *drvthis);
 MODULE_EXPORT void picoLCD_string(Driver *drvthis, int x, int y, unsigned char string[]);
 MODULE_EXPORT void picoLCD_chr(Driver *drvthis, int x, int y, unsigned char c);
-MODULE_EXPORT void picoLCD_set_char (Driver *drvthis, int n, unsigned char *dat);
 MODULE_EXPORT char *picoLCD_get_key(Driver *drvthis);
 
+MODULE_EXPORT int picoLCD_get_free_chars (Driver *drvthis);
+MODULE_EXPORT void picoLCD_set_char (Driver *drvthis, int n, unsigned char *dat);
+
 MODULE_EXPORT void picoLCD_vbar(Driver *drvthis, int x, int y, int len, int promille, int options);
 MODULE_EXPORT void picoLCD_hbar(Driver *drvthis, int x, int y, int len, int promille, int options);
 MODULE_EXPORT void picoLCD_num(Driver *drvthis, int x, int num);
diff --git a/server/drivers/text.h b/server/drivers/text.h
index b780926..f9eaadc 100644
--- a/server/drivers/text.h
+++ b/server/drivers/text.h
@@ -13,6 +13,7 @@ MODULE_EXPORT void text_string (Driver *drvthis, int x, int y, const char string
 MODULE_EXPORT void text_chr (Driver *drvthis, int x, int y, char c);
 MODULE_EXPORT void text_set_contrast (Driver *drvthis, int promille);
 MODULE_EXPORT void text_backlight (Driver *drvthis, int on);
+MODULE_EXPORT const char * text_get_info (Driver *drvthis);
 
 #define TEXTDRV_DEFAULT_SIZE "20x4"
 
diff --git a/server/drivers/ula200.c b/server/drivers/ula200.c
index a9ab536..4a6532f 100644
--- a/server/drivers/ula200.c
+++ b/server/drivers/ula200.c
@@ -432,7 +432,7 @@ ula200_ftdi_rawdata(Driver *drvthis, unsigned char flags, unsigned char ch)
 {
     //PrivateData *p = (PrivateData *) drvthis->private_data;
     unsigned char command[3];
-    unsigned int err;
+    int err;
 
     command[0] = 'R';
     command[1] = flags == (RS_DATA) ? '2' : '0';
diff --git a/server/drivers/ula200.h b/server/drivers/ula200.h
index 529b4a8..13f36b8 100644
--- a/server/drivers/ula200.h
+++ b/server/drivers/ula200.h
@@ -35,12 +35,11 @@ MODULE_EXPORT int  ula200_height (Driver *drvthis);
 MODULE_EXPORT void ula200_clear (Driver *drvthis);
 MODULE_EXPORT void ula200_string (Driver *drvthis, int x, int y, const char string[]);
 MODULE_EXPORT void ula200_chr (Driver *drvthis, int x, int y, char c);
-MODULE_EXPORT void ula200_set_char (Driver *drvthis, int n, char *dat);
 MODULE_EXPORT void ula200_backlight (Driver *drvthis, int on);
 MODULE_EXPORT void ula200_flush (Driver *drvthis);
 MODULE_EXPORT void ula200_vbar (Driver *drvthis, int x, int y, int len, int promille, int options);
 MODULE_EXPORT void ula200_hbar (Driver *drvthis, int x, int y, int len, int promille, int options);
 MODULE_EXPORT void ula200_num (Driver *drvthis, int x, int num);
 MODULE_EXPORT int  ula200_icon(Driver *drvthis, int x, int y, int icon);
-
+MODULE_EXPORT const char * ula200_get_key (Driver *drvthis);
 #endif /* ULA200_H */
diff --git a/server/drivers/xosdlib_drv.h b/server/drivers/xosdlib_drv.h
index 39f6ec5..16bf903 100644
--- a/server/drivers/xosdlib_drv.h
+++ b/server/drivers/xosdlib_drv.h
@@ -45,8 +45,8 @@ MODULE_EXPORT void xosdlib_drv_chr (Driver *drvthis, int x, int y, char c);
 
 MODULE_EXPORT void xosdlib_drv_vbar (Driver *drvthis, int x, int y, int len, int promille, int pattern);
 MODULE_EXPORT void xosdlib_drv_hbar (Driver *drvthis, int x, int y, int len, int promille, int pattern);
-MODULE_EXPORT void xosdlib_drv_old_num (Driver *drvthis, int x, int num);
-
+MODULE_EXPORT void xosdlib_drv_num (Driver *drvthis, int x, int num);
+MODULE_EXPORT int  xosdlib_drv_get_free_chars (Driver *drvthis);
 MODULE_EXPORT int  xosdlib_drv_get_contrast (Driver *drvthis);
 MODULE_EXPORT void xosdlib_drv_set_contrast (Driver *drvthis, int promille);
 MODULE_EXPORT int  xosdlib_drv_get_brightness(Driver *drvthis, int state);