From b7fb90dbd59e9e25aace2d46373cff0468498c6f Mon Sep 17 00:00:00 2001
From: Peter Veenstra <qbix79@users.sourceforge.net>
Date: Thu, 10 Jun 2004 08:48:53 +0000
Subject: [PATCH] Added double byte stuff the proper way (empty table)

Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1820
---
 include/dos_inc.h      |  3 ++-
 src/dos/dos.cpp        | 11 +++++++++--
 src/dos/dos_tables.cpp |  8 ++++++--
 3 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/include/dos_inc.h b/include/dos_inc.h
index 579471d5..fed50e6d 100644
--- a/include/dos_inc.h
+++ b/include/dos_inc.h
@@ -16,7 +16,7 @@
  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  */
 
-/* $Id: dos_inc.h,v 1.44 2004-05-15 07:57:02 harekiet Exp $ */
+/* $Id: dos_inc.h,v 1.45 2004-06-10 08:48:53 qbix79 Exp $ */
 
 #ifndef DOS_H_
 #define DOS_H_
@@ -563,6 +563,7 @@ struct DOS_Block {
 	struct  {
 		RealPt mediaid;
 		RealPt tempdta;
+		RealPt dcbs;
 	} tables;
 };
 
diff --git a/src/dos/dos.cpp b/src/dos/dos.cpp
index 3a9928f9..eab79ba4 100644
--- a/src/dos/dos.cpp
+++ b/src/dos/dos.cpp
@@ -16,7 +16,7 @@
  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  */
 
-/* $Id: dos.cpp,v 1.71 2004-05-04 18:34:07 qbix79 Exp $ */
+/* $Id: dos.cpp,v 1.72 2004-06-10 08:48:53 qbix79 Exp $ */
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -801,6 +801,14 @@ static Bitu DOS_21Handler(void) {
 	case 0x62:					/* Get Current PSP Address */
 		reg_bx=dos.psp();
 		break;
+	case 0x63:					/* DOUBLE BYTE CHARACTER SET */
+		if(reg_al == 0) {
+			SegSet16(ds,RealSeg(dos.tables.dcbs));
+			reg_si=RealOff(dos.tables.dcbs);		
+			reg_al = 0;
+			CALLBACK_SCF(false); //undocumented
+		} else reg_al = 0xff; //Doesn't officially touch carry flag
+		break;
 	case 0x64:					/* Set device driver lookahead flag */
 		E_Exit("Unhandled Dos 21 call %02X",reg_ah);
 		break;
@@ -895,7 +903,6 @@ static Bitu DOS_21Handler(void) {
 		break;
 
     case 0x68:                  /* FFLUSH Commit file */
-    case 0x63:					/* Weirdo double byte stuff (fails but say it succeeded) available only in MSDOS 2.25  */
         CALLBACK_SCF(false);    //mirek
     case 0xE0:
     case 0x18:	            	/* NULL Function for CP/M compatibility or Extended rename FCB */
diff --git a/src/dos/dos_tables.cpp b/src/dos/dos_tables.cpp
index d54c3139..e45fa3f3 100644
--- a/src/dos/dos_tables.cpp
+++ b/src/dos/dos_tables.cpp
@@ -16,7 +16,7 @@
  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  */
 
-/* $Id: dos_tables.cpp,v 1.10 2004-05-04 18:34:08 qbix79 Exp $ */
+/* $Id: dos_tables.cpp,v 1.11 2004-06-10 08:48:53 qbix79 Exp $ */
 
 #include "dosbox.h"
 #include "mem.h"
@@ -78,9 +78,13 @@ void DOS_SetupTables(void) {
 	//CON string
 	real_writew(0x54,0x20+0x00, (Bit16u) 0x4f43);
 	real_writew(0x54,0x20+0x02, (Bit16u) 0x204e);
+
+	/* Allocate DCBS DOUBLE BYTE CHARACTER SET LEAD-BYTE TABLE */
+	dos.tables.dcbs=RealMake(DOS_GetMemory(3),0);
+	mem_writew(Real2Phys(dos.tables.dcbs),0); //empty table
+
 	/* Allocate some fake memory else pharlab doesn't like the indos pointer */
 	sdaseg=DOS_GetMemory(12);
-	sdaseg=DOS_GetMemory(3);
 	DOS_SDA(sdaseg,0).Init();
    
 }