From f7ad3ece4e06d52ddcc4d44f075cf200b466ee53 Mon Sep 17 00:00:00 2001
From: Peter Veenstra <qbix79@users.sourceforge.net>
Date: Wed, 23 Nov 2011 12:18:58 +0000
Subject: [PATCH] Improve behavior when reaching the end of the buffer. (thanks
 ripsaw)

Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3761
---
 src/dos/dos.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/dos/dos.cpp b/src/dos/dos.cpp
index 150dde99..baba3c3b 100644
--- a/src/dos/dos.cpp
+++ b/src/dos/dos.cpp
@@ -220,6 +220,7 @@ static Bitu DOS_21Handler(void) {
 			Bit8u free=mem_readb(data);
 			Bit8u read=0;Bit8u c;Bit16u n=1;
 			if (!free) break;
+			free--;
 			for(;;) {
 				DOS_ReadFile(STDIN,&c,&n);
 				if (c == 8) {			// Backspace
@@ -232,7 +233,7 @@ static Bitu DOS_21Handler(void) {
 					}
 					continue;
 				}
-				if (read >= free) {		// Keyboard buffer full
+				if (read == free && c != 13) {		// Keyboard buffer full
 					Bit8u bell = 7;
 					DOS_WriteFile(STDOUT, &bell, &n);
 					continue;