From 2d2121611836bb43511a85016f90f6bb10ed5a47 Mon Sep 17 00:00:00 2001
From: Robert Pengelly <robertapengelly@hotmail.com>
Date: Sun, 18 Oct 2026 10:29:05 +0100
Subject: [PATCH] Handle ASCII control character echo using caret notation

---
 interrupts.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/interrupts.c b/interrupts.c
index 0d4c43d..aa2fe01 100644
--- a/interrupts.c
+++ b/interrupts.c
@@ -2133,7 +2133,14 @@ static void dos_buffered_line_input (CPU8086 *cpu) {
             count++;
             
             /* echo */
-            dos_write_console_char (stdout, (uint8_t) c);
+            if (c < 0x20) {
+            
+                putchar ('^');
+                putchar (c + 0x40);
+            
+            } else {
+                dos_write_console_char (stdout, (uint8_t) c);
+            }
         
         }
     
-- 
2.34.1