diff --git a/viz/curses/7segments.c b/viz/curses/7segments.c
index d895dc7..6b52458 100644
--- a/viz/curses/7segments.c
+++ b/viz/curses/7segments.c
@@ -86,6 +86,8 @@ fprintf(stderr, ">>> %s ( %p %d %d '%c' )\n", __func__,
 			win, lig, col, digit);
 #endif
 
+if (isxdigit(digit))   digit = toupper(digit);
+
 switch (digit) {
 	case '0':	bits = 0x3f;		break;
 	case '1':	bits = 0x06;		break;
@@ -98,6 +100,14 @@ switch (digit) {
 	case '8':	bits = 0x7f;		break;
 	case '9':	bits = 0x6f;		break;
 
+	/* hexadecimal letters */
+	case 'A':	bits = 0x77;		break;
+	case 'B':	bits = 0x7c;		break;
+	case 'C':	bits = 0x39;		break;
+	case 'D':	bits = 0x5e;		break;
+	case 'E':	bits = 0x79;		break;
+	case 'F':	bits = 0x71;		break;
+
 	case ' ':	bits = 0;		break;
 	case '.':	bits = 0x80;		break;
 
diff --git a/viz/curses/t.c b/viz/curses/t.c
index afb036d..4143376 100644
--- a/viz/curses/t.c
+++ b/viz/curses/t.c
@@ -18,7 +18,7 @@ char		ligne[100];
 
 
 for (loop=0; loop<nbl; loop++) {
-	sprintf(ligne, "%5d", loop);
+	sprintf(ligne, "%04x", loop);
 	mvaddstr(2, 1, ligne);
 	for (idx=0; idx<strlen(ligne); idx++) {
 		aff7segs_digit(stdscr, 3, 10+(idx*9), ligne[idx]);