diff --git a/converter/ibm4704_usb/matrix.c b/converter/ibm4704_usb/matrix.c
index f25452d5..8b9b518d 100644
--- a/converter/ibm4704_usb/matrix.c
+++ b/converter/ibm4704_usb/matrix.c
@@ -29,7 +29,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 static void matrix_make(uint8_t code);
 static void matrix_break(uint8_t code);
-static void matrix_clear(void);
 
 
 /*
@@ -155,8 +154,7 @@ static void matrix_break(uint8_t code)
     matrix[ROW(code)] &= ~(1<<COL(code));
 }
 
-inline
-static void matrix_clear(void)
+void matrix_clear(void)
 {
     for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
 }
diff --git a/converter/ps2_usb/matrix.c b/converter/ps2_usb/matrix.c
index 24b29ed3..c441a89b 100644
--- a/converter/ps2_usb/matrix.c
+++ b/converter/ps2_usb/matrix.c
@@ -29,10 +29,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 static void matrix_make(uint8_t code);
 static void matrix_break(uint8_t code);
-static void matrix_clear(void);
-#ifdef MATRIX_HAS_GHOST
-static bool matrix_has_ghost_in_row(uint8_t row);
-#endif
 
 
 /*
@@ -71,18 +67,6 @@ static uint8_t matrix[MATRIX_ROWS];
 static bool is_modified = false;
 
 
-inline
-uint8_t matrix_rows(void)
-{
-    return MATRIX_ROWS;
-}
-
-inline
-uint8_t matrix_cols(void)
-{
-    return MATRIX_COLS;
-}
-
 void matrix_init(void)
 {
     debug_enable = true;
@@ -398,23 +382,6 @@ uint8_t matrix_scan(void)
     return 1;
 }
 
-bool matrix_is_modified(void)
-{
-    return is_modified;
-}
-
-inline
-bool matrix_has_ghost(void)
-{
-#ifdef MATRIX_HAS_GHOST
-    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
-        if (matrix_has_ghost_in_row(i))
-            return true;
-    }
-#endif
-    return false;
-}
-
 inline
 bool matrix_is_on(uint8_t row, uint8_t col)
 {
@@ -427,21 +394,6 @@ uint8_t matrix_get_row(uint8_t row)
     return matrix[row];
 }
 
-void matrix_print(void)
-{
-    print("\nr/c 01234567\n");
-    for (uint8_t row = 0; row < matrix_rows(); row++) {
-        phex(row); print(": ");
-        pbin_reverse(matrix_get_row(row));
-#ifdef MATRIX_HAS_GHOST
-        if (matrix_has_ghost_in_row(row)) {
-            print(" <ghost");
-        }
-#endif
-        print("\n");
-    }
-}
-
 uint8_t matrix_key_count(void)
 {
     uint8_t count = 0;
@@ -451,23 +403,6 @@ uint8_t matrix_key_count(void)
     return count;
 }
 
-#ifdef MATRIX_HAS_GHOST
-inline
-static bool matrix_has_ghost_in_row(uint8_t row)
-{
-    // no ghost exists in case less than 2 keys on
-    if (((matrix[row] - 1) & matrix[row]) == 0)
-        return false;
-
-    // ghost exists in case same state as other row
-    for (uint8_t i=0; i < MATRIX_ROWS; i++) {
-        if (i != row && (matrix[i] & matrix[row]) == matrix[row])
-            return true;
-    }
-    return false;
-}
-#endif
-
 
 inline
 static void matrix_make(uint8_t code)
@@ -487,8 +422,7 @@ static void matrix_break(uint8_t code)
     }
 }
 
-inline
-static void matrix_clear(void)
+void matrix_clear(void)
 {
     for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
 }
diff --git a/converter/xt_usb/matrix.c b/converter/xt_usb/matrix.c
index 92fa6935..de9706a6 100644
--- a/converter/xt_usb/matrix.c
+++ b/converter/xt_usb/matrix.c
@@ -28,7 +28,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 static void matrix_make(uint8_t code);
 static void matrix_break(uint8_t code);
-static void matrix_clear(void);
 #ifdef MATRIX_HAS_GHOST
 static bool matrix_has_ghost_in_row(uint8_t row);
 #endif
@@ -326,8 +325,7 @@ static void matrix_break(uint8_t code)
     }
 }
 
-inline
-static void matrix_clear(void)
+void matrix_clear(void)
 {
     for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
 }