From 7c919537f0604daf895981c10bebd36ee67cd2c3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20Strohh=C3=A4cker?=
 <c2woody@users.sourceforge.net>
Date: Sat, 17 Dec 2005 16:28:18 +0000
Subject: [PATCH] add truemem field, correct reported memory for tandy
 (Transsylvania/TandyDOS)

Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2415
---
 include/bios.h    |  1 +
 src/ints/bios.cpp | 10 ++++++++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/include/bios.h b/include/bios.h
index ccb4d9ee..fc015ccc 100644
--- a/include/bios.h
+++ b/include/bios.h
@@ -30,6 +30,7 @@
 #define BIOS_CONFIGURATION              0x410
 /* 0x412 is reserved */
 #define BIOS_MEMORY_SIZE                0x413
+#define BIOS_TRUE_MEMORY_SIZE           0x415
 /* #define bios_expansion_memory_size      (*(unsigned int   *) 0x415) */
 #define BIOS_KEYBOARD_STATE             0x417
 #define BIOS_KEYBOARD_FLAGS1            BIOS_KEYBOARD_STATE
diff --git a/src/ints/bios.cpp b/src/ints/bios.cpp
index a07aeb1d..11ca7096 100644
--- a/src/ints/bios.cpp
+++ b/src/ints/bios.cpp
@@ -16,7 +16,7 @@
  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  */
 
-/* $Id: bios.cpp,v 1.53 2005-12-04 21:17:29 c2woody Exp $ */
+/* $Id: bios.cpp,v 1.54 2005-12-17 16:28:18 c2woody Exp $ */
 
 #include "dosbox.h"
 #include "mem.h"
@@ -835,7 +835,13 @@ public:
 		/* INT 12 Memory Size default at 640 kb */
 		callback[2].Install(&INT12_Handler,CB_IRET,"Int 12 Memory");
 		callback[2].Set_RealVec(0x12);
-		mem_writew(BIOS_MEMORY_SIZE,640);
+		if (IS_TANDY_ARCH) {
+			/* reduce reported memory size for the Tandy (32k graphics memory
+			   at the end of the conventional 640k) */
+			if (machine==MCH_TANDY) mem_writew(BIOS_MEMORY_SIZE,608);
+			else mem_writew(BIOS_MEMORY_SIZE,640);
+			mem_writew(BIOS_TRUE_MEMORY_SIZE,640);
+		} else mem_writew(BIOS_MEMORY_SIZE,640);
 		
 		/* INT 13 Bios Disk Support */
 		BIOS_SetupDisks();