From http://woz.gs/tim/zork/frotz-2.43-flush.tar.gz

diff -urN frotz-2.43/src/dumb/dumb_input.c frotz-2.43-flush/src/dumb/dumb_input.c
--- frotz-2.43/src/dumb/dumb_input.c	2002-10-27 02:44:10.000000000 +0100
+++ frotz-2.43-flush/src/dumb/dumb_input.c	2003-12-08 00:23:59.000000000 +0100
@@ -54,7 +54,7 @@
 ;
 
 static float speed = 1;
-static bool do_more_prompts = TRUE;
+static bool do_more_prompts = FALSE;
 
 enum input_type {
   INPUT_CHAR,
@@ -203,6 +203,7 @@
       fputs(prompt, stdout);
     else
       dumb_show_prompt(show_cursor, (timeout ? "tTD" : ")>}")[type]);
+    fflush(NULL);
     getline(s);
     if ((s[0] != '\\') || ((s[1] != '\0') && !islower(s[1]))) {
       /* Is not a command line.  */
@@ -385,10 +386,11 @@
   char buf[INPUT_BUFFER_SIZE], prompt[INPUT_BUFFER_SIZE];
   FILE *fp;
 
-  sprintf(prompt, "Please enter a filename [%s]: ", default_name);
+  sprintf(prompt, "Please enter a filename [%s]:\n", default_name);
   dumb_read_misc_line(buf, prompt);
   if (strlen(buf) > MAX_FILE_NAME) {
     printf("Filename too long\n");
+    fflush(NULL);
     return FALSE;
   }
 
@@ -398,7 +400,7 @@
   if ((flag == FILE_SAVE || flag == FILE_SAVE_AUX || flag == FILE_RECORD)
       && ((fp = fopen(file_name, "rb")) != NULL)) {
     fclose (fp);
-    dumb_read_misc_line(buf, "Overwrite existing file? ");
+    dumb_read_misc_line(buf, "Overwrite existing file?\n");
     return(tolower(buf[0]) == 'y');
   }
   return TRUE;
diff -urN frotz-2.43/src/dumb/dumb_output.c frotz-2.43-flush/src/dumb/dumb_output.c
--- frotz-2.43/src/dumb/dumb_output.c	2002-10-27 03:15:56.000000000 +0100
+++ frotz-2.43-flush/src/dumb/dumb_output.c	2003-12-08 00:23:58.000000000 +0100
@@ -294,6 +294,7 @@
       show_cell(dumb_row(r)[c]);
   }
   putchar('\n');
+  fflush(NULL);
 }
 
 /* Print the part of the cursor row before the cursor.  */