-eraseBS and -eraseDEL added

docs/quickstart.md

@@ -82,6 +82,17 @@ Use -noAutoClear to disable this.
 | -half    | Use half of the screen width.            |
 | -b9600…  | Emulate terminal baud rates              |
 
+Some historical systems expect BS (^H, 0x08) as the erase character,
+while others expect DEL (^?, 0x7F).
+
+If the Backspace/Delete key does not work correctly, try:
+
+    tek4010 -eraseBS
+
+or
+
+    tek4010 -eraseDEL
+
 ---
 
 More options and detailed information, including

src/main.c

@@ -89,6 +89,9 @@ guint global_timeout_ref;
 
 extern int tube_doClearPersistent;
 
+#define ERASE_BS   0x08
+#define ERASE_DEL  0x7F
+
 static void do_drawing(cairo_t *, GtkWidget *);
 
 long now_msec(void)
@@ -299,6 +302,12 @@ static void on_key_press(GtkWidget *widget, GdkEventKey *event, gpointer user_da
 			}
 		}
 		
+		// Backspace/Delete/Rubout key
+        else if ((event->keyval == 0xFF08) ||      // Backspace
+                 (event->keyval == 0xFFFF)) {      // Delete/Rubout
+                ch = argEraseChar;
+        }
+		
 		// exit on ctrl-c if child has exited
 		if (childExited &&
 			(event->state & GDK_CONTROL_MASK) && (event->keyval == 0x0064)) {
@@ -310,7 +319,7 @@ static void on_key_press(GtkWidget *widget, GdkEventKey *event, gpointer user_da
         else if ((event->keyval >= 0xFF00) && (event->keyval <= 0xFF1F)) 
                 ch = event->keyval & 0x1F;
                 
-                // ctrl-letter keys: pass through as ASCII control characters        
+        // ctrl-letter keys: pass through as ASCII control characters        
         else if (event->state & GDK_CONTROL_MASK)
                 ch = event->keyval & 0x1F;
                 		

src/tube.c

@@ -122,6 +122,9 @@ int aplMode = 0;
 pid_t childPid = -1;
 int argPty = 0;
 
+#define ERASE_BS   0x08
+#define ERASE_DEL  0x7F
+int argEraseChar = ERASE_BS;
 
 int tube_x0, tube_x2,tube_y0, tube_y2;
 
@@ -394,7 +397,7 @@ void tube_init(int argc, char* argv[])
 		int ptyMaster = -1;
 		argAutoClear = 1;
 		argNoexit = 1;
-        printf("tek4010 version 2.0\n");
+        printf("tek4010 version 2.0.1\n");
         windowName = "Tektronix 4010/4014 emulator";
 		if (argc > 19) {
 	            printf("Error: Too many arguments\n");
@@ -481,6 +484,12 @@ void tube_init(int argc, char* argv[])
                         argHalf = 1;
                 else if (strcmp(argv[firstArg],"-escdebug") == 0)
                         argEscDebug = 1;
+                        
+                else if (strcmp(argv[firstArg],"-eraseBS") == 0)
+                        argEraseChar = ERASE_BS;
+                else if (strcmp(argv[firstArg],"-eraseDEL") == 0)
+                        argEraseChar = ERASE_DEL;
+                        
                 else {
                         printf("tek4010: unknown argument %s\n", argv[firstArg]);
                         exit(1);
@@ -566,7 +575,7 @@ void tube_init(int argc, char* argv[])
                         tio.c_lflag &= ~ECHOCTL;
 #endif
                         tio.c_lflag |= ECHOE;
-                        tio.c_cc[VERASE] = 0x08;
+                        tio.c_cc[VERASE] = argEraseChar;
                         tcsetattr(STDIN_FILENO, TCSANOW, &tio);
                 }
 

src/tube.h

@@ -55,6 +55,8 @@ extern int tube_x0, tube_x2, tube_y0, tube_y2;
 
 extern double pensize;
 
+extern int argEraseChar;
+
 extern long tube_mSeconds();
 extern long tube_u100ResetSeconds(int reset);
 extern int tube_translateKeyCode(int ch);

versions.txt

@@ -1,3 +1,7 @@
+Version 2.0.1 April 9, 2026
+===========================
+added -eraseBS and -eraseDEL options
+
 Version 2.0 April 9, 2026
 =========================
 Terminal mode added. Improved timing.