From 866c5886e5d16b78875992b93e556462bc6477b6 Mon Sep 17 00:00:00 2001
From: Peter Hawkins <peter@hawkins.emu.id.au>
Date: Fri, 13 Oct 2000 20:22:34 +0000
Subject: [PATCH] Added DOS int 21h function 4452h support (DR-DOS version
 check).

---
 msdos/int21.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/msdos/int21.c b/msdos/int21.c
index aa7fa8b8789..acfbce0cb7a 100644
--- a/msdos/int21.c
+++ b/msdos/int21.c
@@ -1727,6 +1727,16 @@ void WINAPI DOS3Call( CONTEXT86 *context )
         case 0xe0:  /* Sun PC-NFS API */
             /* not installed */
             break;
+	
+	case 0x52:  /* DR-DOS version */
+            /* This is not DR-DOS */
+
+            TRACE("GET DR-DOS VERSION requested");
+
+            AX_reg(context) = 0x0001; /* Invalid function */
+            SET_CFLAG(context);       /* Error */
+            SetLastError( ERROR_INVALID_FUNCTION );
+            break;
                 
         default:
             INT_BARF( context, 0x21 );