diff --git a/DLL-dds_220_l.rtf b/DLL-dds_221_n.rtf
similarity index 95%
rename from DLL-dds_220_l.rtf
rename to DLL-dds_221_n.rtf
index f554337b..c195b14c 100644
--- a/DLL-dds_220_l.rtf
+++ b/DLL-dds_221_n.rtf
@@ -2,11 +2,11 @@
 {\colortbl ;\red0\green0\blue255;\red0\green0\blue0;\red255\green0\blue0;}
 {\stylesheet{ Normal;}{\s1 heading 1;}{\s2 heading 2;}{\s3 heading 3;}}
 {\*\generator Msftedit 5.41.21.2510;}\viewkind4\uc1\pard\nowidctlpar\lang1053\f0\fs20 Bo Haglund, Bob Richardson\par
-Rev M, 2012-07-06\par
+Rev N, 2012-07-16\par
 Latest DLL issue with this description is available at {\field{\*\fldinst{HYPERLINK "http://www.bahnhof.se/wb758135/"}}{\fldrslt{\ul\cf1 http://www.bahnhof.se/wb758135/}}}\f0\fs20\par
 \par
 \par
-\pard\keepn\nowidctlpar\s2\cf2\ul\b Short description of the DLL functions supported in Double Dummy Problem Solver 2.2.0\par
+\pard\keepn\nowidctlpar\s2\cf2\ul\b Short description of the DLL functions supported in Double Dummy Problem Solver 2.2.1\par
 \pard\nowidctlpar\ulnone\b0\par
 \pard\keepn\nowidctlpar\s3\b Callable functions\par
 \pard\nowidctlpar\b0\par
@@ -26,7 +26,7 @@ extern "C" __declspec(dllimport) int __stdcall SolveAllBoards(struct boardsPBN *
 \par
 \pard\keepn\nowidctlpar\s3\b SolveBoard\par
 \pard\nowidctlpar\b0\par
-SolveBoard is thread-safe, so several threads (max 16) can call SolveBoard in parallel.\par
+SolveBoard is thread-safe, so several threads (max 8) can call SolveBoard in parallel.\par
 \par
 Before SolveBoard can be called, a structure of type "futureTricks" must be declared. \par
 \par
@@ -45,7 +45,7 @@ Before SolveBoard can be called, a structure of type "futureTricks" must be decl
 -12=Suit or rank value out of range for deal.currentTrickSuit or deal.currentTrickRank.\par
 -13=Card already played in the current trick is also defined as a remaining card to play.\par
 -14=Wrong number of remaining cards for a hand.\par
--15=threadIndex < 0 or > 15.\line   \line Structure \rdblquote\b deal\b0\rdblquote  defines all data needed to describe the deal to be analyzed.\par
+-15=threadIndex < 0 or > 7.\line   \line Structure \rdblquote\b deal\b0\rdblquote  defines all data needed to describe the deal to be analyzed.\par
 struct deal \{\f1  \par
 \f0    int trump;   /* I.e. which suit that is trump or if contract is NT, Spades=0, Hearts=1, Diamonds=2, Clubs=3,  NT=4 */\f1  \par
 \f0    int first;      /* 0-3, 0=North, 1=East, 2=South, 3=West , Leading hand for the trick.*/\f1  \par
@@ -77,7 +77,7 @@ struct \b futureTricks\b0  \{ /* The DLL provides the score (number of tricks) t
 \f0\} ; \par
 \par
 Parameter \rdblquote\b threadIndex\b0\rdblquote  defines the identity of the thread used when calling SolveBoard.\par
-Maximum 16 threads can call SolveBoard in parallel, threadIndex must be an integer of the range 0..15.\par
+Maximum 8 threads can call SolveBoard in parallel, threadIndex must be an integer of the range 0..7.\par
 \cf0\lang1033\fs24\par
 \pard\keepn\nowidctlpar\s3\cf2\lang1053\b\fs20\par
 SolveBoardPBN\par
@@ -182,6 +182,9 @@ Rev K, 2010-10-27\tab Correction of fault in the description:  2nd index in resT
 Rev L, 2011-10-14\tab Added SolveBoardPBN and CalcDDtablePBN.\par
 \par
 Rev M, 2012-07-06\tab Added SolveAllBoards. \par
+\par
+Rev N, 2012-07-16\tab Max number of threads is 8. \par
+\par
  \par
 \par
 }
diff --git a/dds.cpp b/dds.cpp
index 501bac83..0beb7853 100644
--- a/dds.cpp
+++ b/dds.cpp
@@ -1,5 +1,5 @@
 
-/* DDS 2.2.0   A bridge double dummy solver.				      */
+/* DDS 2.2.1   A bridge double dummy solver.				      */
 /* Copyright (C) 2006-2011 by Bo Haglund                                      */
 /* Cleanups and porting to Linux and MacOSX (C) 2006 by Alex Martelli         */
 /*								              */
@@ -17,7 +17,7 @@
 /* along with this program; if not, write to the Free Software                */
 /* Foundation, Inc, 51 Franklin Street, 5th Floor, Boston MA 02110-1301, USA. */
 
-/*#include "stdafx.h"*/ 	/* Needed by Visual C++ */
+#include "stdafx.h" 	/* Needed by Visual C++ */
 
 #include "dll.h"
 
@@ -837,7 +837,7 @@ int _initialized=0;
 void InitStart(int gb_ram, int ncores) {
   int k, r, i, j, m;
   unsigned short int res;
-  long double pcmem;	/* kbytes */
+  unsigned __int64 pcmem;	/* kbytes */
 
   if (_initialized)
       return;
@@ -854,19 +854,18 @@ void InitStart(int gb_ram, int ncores) {
     SYSTEM_INFO temp; 
 
     MEMORYSTATUSEX statex;
+	statex.dwLength = sizeof (statex);
 
     GlobalMemoryStatusEx (&statex);
 
-    pcmem=(long double)statex.ullTotalPhys/1024;
+    pcmem=(unsigned __int64)statex.ullTotalPhys/1024;
 
-    if (pcmem < 1500000.0)
+    if (pcmem < 1500000)
 	  noOfThreads=Min(MAXNOOFTHREADS, 2);
-    else if (pcmem < 2500000.0/*1500000.0*/)
+    else if (pcmem < 2500000)
       noOfThreads=Min(MAXNOOFTHREADS, 4);
-    else if (pcmem < 4500000.0)
+    else 
       noOfThreads=Min(MAXNOOFTHREADS, 8); 
-    else
-      noOfThreads=Min(MAXNOOFTHREADS, 16); 
 
     GetSystemInfo(&temp);
     noOfCores=Min(noOfThreads, (int)temp.dwNumberOfProcessors);
@@ -875,16 +874,14 @@ void InitStart(int gb_ram, int ncores) {
   else {
     if (gb_ram < 2)
       noOfThreads=Min(MAXNOOFTHREADS, 2);
-    else if (gb_ram < 3/*2*/)
+    else if (gb_ram < 3)
       noOfThreads=Min(MAXNOOFTHREADS, 4);
-    else if (gb_ram < 5)
+    else 
       noOfThreads=Min(MAXNOOFTHREADS, 8);
-    else
-      noOfThreads=Min(MAXNOOFTHREADS, 16);
 
     noOfCores=Min(noOfThreads, ncores);
 
-    pcmem=(long double)(1000000 * gb_ram);
+    pcmem=(unsigned __int64)(1000000 * gb_ram);
   }
 
   /*printf("noOfThreads: %d   noOfCores: %d\n", noOfThreads, noOfCores);*/
@@ -910,7 +907,7 @@ void InitStart(int gb_ram, int ncores) {
 		   25000001*sizeof(struct winCardType)+
 		   400001*sizeof(struct posSearchType))/noOfThreads);
     else {
-      localVar[k].maxmem = (__int64)(pcmem-32678) * (700/noOfThreads);  
+      localVar[k].maxmem = (unsigned __int64)(pcmem-32678) * (700/noOfThreads);  
 	  /* Linear calculation of maximum memory, formula by Michiel de Bondt */
 
       if (localVar[k].maxmem < 10485760) exit (1);
@@ -4621,7 +4618,9 @@ move 2 is the presently winning card of the trick */
       return TRUE;
     else
       return FALSE;
-  }    
+  } 
+  else
+    return FALSE;
 }
 
 
@@ -5573,7 +5572,7 @@ int SolveAllBoards4(struct boards *bop, struct solvedBoards *solvedp) {
   if (param.error==0)
     return 1;
   else
-    return param.error;
+	return param.error;
 }
 
 DWORD CALLBACK SolveChunk (void *) {
@@ -5600,7 +5599,7 @@ DWORD CALLBACK SolveChunk (void *) {
     param.bop->solutions[j], param.bop->mode[j], futp[j], thid);
     if (res==1) {
       param.solvedp->solvedBoard[j]=fut[j];
-      param.error=0;
+	  param.error=0;
     }
     else {
       param.error=res;
@@ -5671,7 +5670,7 @@ int SolveAllBoards1(struct boards *bop, struct solvedBoards *solvedp) {
   if (param.error==0)
     return 1;
   else
-    return param.error;
+	return param.error;
 }
 #else 
 int SolveAllBoards4(struct boards *bop, struct solvedBoards *solvedp) {
diff --git a/dll.h b/dll.h
index 565a35fd..e04aed07 100644
--- a/dll.h
+++ b/dll.h
@@ -28,7 +28,7 @@
 
 /* end of portability-macros section */
 
-#define DDS_VERSION		20200	/* Version 2.2.0. Allowing for 2 digit
+#define DDS_VERSION		20201	/* Version 2.2.1. Allowing for 2 digit
 					minor versions */
 
 #define PBN
@@ -61,7 +61,7 @@
 #endif
 #define INFINITY    32000
 
-#define MAXNOOFTHREADS	16
+#define MAXNOOFTHREADS	8/*16*/
 
 #define MAXNODE     1
 #define MINNODE     0
@@ -330,9 +330,9 @@ struct localVarType {
   int nodeSetSizeLimit;
   int winSetSizeLimit;
   int lenSetSizeLimit;
-  __int64 maxmem;		/* bytes */
-  __int64 allocmem;
-  __int64 summem;
+  unsigned __int64 maxmem;		/* bytes */
+  unsigned __int64 allocmem;
+  unsigned __int64 summem;
   int wmem;
   int nmem; 
   int lmem;
diff --git a/readme.txt b/readme.txt
index b999ac97..53bf7e83 100644
--- a/readme.txt
+++ b/readme.txt
@@ -1,4 +1,4 @@
-DDS 2.2.0,  Bo Haglund 2012-07-06
+DDS 2.2.1,  Bo Haglund 2012-07-16
 
 For Win32, DDS compiles with Visual C++ 2010 Express edition 
 and the Mingw port of gcc.
@@ -25,7 +25,6 @@ The maximum number of simultaneous threads depends on the PC physical memory siz
 1 GB or less, max 2 threads.
 2 GB, max 4 threads.
 3 or 4 GB, max 8 threads.
-More than 4 GB, max 16 threads.
  
 For Windows, allocating memory for the maximum number of simultaneous threads can 
 be done by reading out the physical memory size from Windows. This is done in the DDS.DLL.
@@ -55,7 +54,7 @@ The possible configurens thus are:
 2)  "PBN":  Support for SolveBoardPBN and CalcDDtablePBN.
 3) None of these definitions:  No support for any of the above 3 functions.
 
-Not including code might be necessary when 2.2.0 is to replace an older 2.x.y version,
+Not including code might be necessary when 2.2.1 is to replace an older 2.x.y version,
 and the application using DDS cannot handle a changed interface.
 
 
diff --git a/release_notes.txt b/release_notes.txt
index a0ca4e1e..b0621700 100644
--- a/release_notes.txt
+++ b/release_notes.txt
@@ -326,9 +326,21 @@ function to detect the RAM size.
 1.1.13 is 5-10% faster than 1.1.12.
 
 
+Release Notes DDS 2.2.1
+----------------------- 
+Problem fixed in 2.2.1:
+Fault in using the Windows function to detect RAM memory size that could
+cause DDS termination.
 
+Clarifying that DDS 2.2.1 is a 32-bit DLL not capable of using more than 4 GB.
+Max threads are 8. 
 
 
+Release Notes DDS 1.1.14
+------------------------
+Problem fixed in 1.1.14:
+Fault in using the Windows function to detect RAM memory size that could
+cause DDS termination.