diff --git a/build.bat b/build.bat
index 48eb826..27f2c54 100644
--- a/build.bat
+++ b/build.bat
@@ -3,10 +3,16 @@
 :- batch file to build everything
 :- $Id$
 
-:-----------------------------------------------------------------------
-:- Syntax: BUILD [-r] [fat32|fat16] [msc|wc|tc|tcpp] [86|186|386] [debug] [lfnapi] [/L #]
-:- option case is significant !!
-:-----------------------------------------------------------------------
+if NOT "%1" == "/?" goto start
+echo ":-----------------------------------------------------------------------"
+echo ":- Syntax: BUILD [-r] [fat32|fat16] [msc|wc|tc|tcpp|bc] [86|186|386]    "
+echo ":-               [debug] [lfnapi] [/L #] [/D value]                     "
+echo ":- option case is significant !!                                        "
+echo ":- Note: Open Watcom (wc) is the preferred compiler                     "
+echo ":-----------------------------------------------------------------------"
+goto end
+
+:start
 
 set XERROR=1
 if "%XERROR%" == "" goto noenv
@@ -34,15 +40,18 @@ if "%1" == "msc"   set COMPILER=MSC
 if "%1" == "wc"    set COMPILER=WATCOM
 if "%1" == "tc"    set COMPILER=TC
 if "%1" == "tcpp"  set COMPILER=TCPP
+if "%1" == "bc"    set COMPILER=BC
 
 if "%1" == "86"    set XCPU=86
 if "%1" == "186"   set XCPU=186
 if "%1" == "386"   set XCPU=386
+if "%1" == "x86"   goto setCPU
 
 if "%1" == "debug" set ALLCFLAGS=%ALLCFLAGS% -DDEBUG
 if "%1" == "lfnapi" set ALLCFLAGS=%ALLCFLAGS% -DWITHLFNAPI
 
 if "%1" == "/L"    goto setLoadSeg
+if "%1" == "/D"    goto setDefine
 
 :nextOption
 shift
@@ -92,6 +101,7 @@ echo.
 cd ..\sys
 call %MAKE% all
 if errorlevel 1 goto abort-cd
+if NOT "%XUPX%" == "" %XUPX% ..\bin\sys.com
 
 echo.
 echo Process KERNEL +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
@@ -117,10 +127,27 @@ goto end
 :setLoadSeg
 shift
 if "%1" == "" echo you MUST specify load segment eg 0x60 with /L option
-if "%1" == "" goot abort
+if "%1" == "" goto abort
 set LOADSEG=%1
 goto nextOption
 
+:setCPU
+shift
+if "%1" == "" echo you MUST specify compiler's cpu cmd line argument, eg -5
+if "%1" == "" goto abort
+set XCPU_EX=%1
+goto nextOption
+
+:setDefine
+shift
+:- Give extra compiler DEFINE flags here
+if "%1" == "" echo you MUST specify value to define with /D option
+if "%1" == "" echo such as /D DEBUG : extra DEBUG output
+if "%1" == "" echo or      /D DOSEMU : printf output goes to dosemu log
+if "%1" == "" goto abort
+set ALLCFLAGS=%ALLCFLAGS% -D%1
+goto nextOption
+
 :noenv
 echo Unable to set necessary environment variables!
 goto abort
diff --git a/buildall.bat b/buildall.bat
index 9785bb0..548ed33 100644
--- a/buildall.bat
+++ b/buildall.bat
@@ -1,10 +1,7 @@
 @echo off
 
-:- $Id$
-
 :----------------------------------------------------------
-:- batch file to build _many_ KERNELS, hope build works.
-:- takes 3 minutes on my(TE) Win2K/P700. your milage may vary :-)
+:- batch file to build _many_ KERNELS
 :----------------------------------------------------------
 
 if "%1" == "$SUMMARY" goto summary
@@ -36,6 +33,30 @@ if "%XERROR%" == "" call build.bat -r tc  86 fat32
 if not "%XERROR%" == "" goto daswarwohlnix
 :no_tc
 
+:***** TCPP kernels
+
+if "%TCPP_BASE%" == "" goto no_tcpp
+		    call build.bat -r tcpp 186 fat16
+if "%XERROR%" == "" call build.bat -r tcpp  86 fat16
+if "%XERROR%" == "" call build.bat -r tcpp 186 fat32
+if "%XERROR%" == "" call build.bat -r tcpp  86 fat32
+
+if not "%XERROR%" == "" goto daswarwohlnix
+:no_tcpp
+
+:***** BC kernels
+
+if "%BC_BASE%" == "" goto no_bc
+		    call build.bat -r bc 386 fat16
+if "%XERROR%" == "" call build.bat -r bc 186 fat16
+if "%XERROR%" == "" call build.bat -r bc  86 fat16
+if "%XERROR%" == "" call build.bat -r bc 386 fat32
+if "%XERROR%" == "" call build.bat -r bc 186 fat32
+if "%XERROR%" == "" call build.bat -r bc  86 fat32
+
+if not "%XERROR%" == "" goto daswarwohlnix
+:no_bc
+
 :***** (Open) Watcom kernels
 
 if "%WATCOM%" == "" goto no_wc
diff --git a/config.b b/config.b
index e17b41c..84744e0 100644
--- a/config.b
+++ b/config.b
@@ -22,12 +22,13 @@ set LAST=
 :- NASM/DJGPP crashes when using protected mode Borland's make.
 
 set NASM=c:\bin\nasm16
+::set NASM=c:\bin\nasmw.exe
 
 :-----------------------------------------------------------------------
 :- define COMPILER name here, pick one of them.
 
 :- Turbo C 2.01
-set COMPILER=TC
+:: set COMPILER=TC
 :- Turbo C++ 1.01
 ::set COMPILER=TCPP
 :- Turbo C++ 3.0
@@ -37,33 +38,18 @@ set COMPILER=TC
 :- Microsoft C
 ::set COMPILER=MSC
 :- Watcom C
-::set COMPILER=WATCOM
+set COMPILER=WATCOM
 
 :-----------------------------------------------------------------------
 :- define BASE dir of compiler;
 :- may be defined for all installed compilers.
 
-set TC_BASE=c:\tc
+::set TC_BASE=c:\tc
 ::set TCPP_BASE=c:\tcpp
 ::set TCPP3_BASE=c:\tcpp3
 ::set BC_BASE=c:\bc
 ::set MSC_BASE=c:\msc
-::set WATCOM=c:\watcom
-
-:-----------------------------------------------------------------------
-:- When compiling executable, compilers search linker through PATH;
-:- if some linker not in PATH, uncomment OLDPATH and required SETs PATH.
-
-::set OLDPATH=%PATH%
-::set PATH=%TC_BASE%;%PATH%
-::set PATH=%TCPP_BASE%\bin;%PATH%
-::set PATH=%TCPP3_BASE%\bin;%PATH%
-::set PATH=%BC_BASE%\bin;%PATH%
-::set PATH=%MSC_BASE%\bin;%PATH%
-::set PATH=%WATCOM%\binw;%PATH%
-
-:- MSC searches libraries only through LIB variable.
-::set LIB=%MSC_BASE%\lib
+set WATCOM=c:\watcom
 
 :-----------------------------------------------------------------------
 :- define which linker to use OR it will be determined AUTOMATICALLY.
diff --git a/defaults.bat b/defaults.bat
index 7ae08d3..13d3313 100644
--- a/defaults.bat
+++ b/defaults.bat
@@ -17,12 +17,30 @@ if "%BASE%"     == ""       goto clearset
 
 :-----------------------------------------------------------------------
 
+set BINPATH=%BASE%\bin
+if "%COMPILER%" == "TC"     set BINPATH=%BASE%
+if "%COMPILER%" == "WATCOM" set BINPATH=%BASE%\binw
+if "%COMPILER%" == "WATCOM" if "%OS%" == "Windows_NT" set BINPATH=%BASE%\binnt
+
+echo Path to compiler programs (binaries) is %BINPATH%
+
+:-----------------------------------------------------------------------
+:- When compiling executable, compilers may invoke secondary programs
+:- such as preprocessor, compiler component, or linker through PATH;
+
+set OLDPATH=%PATH%
+set PATH=%BINPATH%;%PATH%
+
+:- MSC searches libraries only through LIB variable.
+if "%COMPILER%" == "MSC" set LIB=%MSC_BASE%\lib
+
+:-----------------------------------------------------------------------
+
 if not "%LINK%" == "" goto skip_link
 
-set LINK=%BASE%\bin\tlink /c/m
-if "%COMPILER%" == "TC"     set LINK=%BASE%\tlink /c/m
-if "%COMPILER%" == "WATCOM" set LINK=call ..\utils\wlinker /nologo
-if "%COMPILER%" == "MSC"    set LINK=%BASE%\bin\link /ONERROR:NOEXE /batch
+set LINK=%BINPATH%\tlink /c/m/s/l
+if "%COMPILER%" == "WATCOM" set LINK=..\utils\wlinker /nologo
+if "%COMPILER%" == "MSC"    set LINK=%BINPATH%\link /ONERROR:NOEXE /batch
 
 echo Linker is %LINK%
 
@@ -32,11 +50,10 @@ echo Linker is %LINK%
 
 if not "%LIBUTIL%" == "" goto skip_lib
 
-set LIBUTIL=%BASE%\bin\tlib
+set LIBUTIL=%BINPATH%\tlib
 set LIBTERM=
-if "%COMPILER%" == "TC"     set LIBUTIL=%BASE%\tlib
-if "%COMPILER%" == "WATCOM" set LIBUTIL=%BASE%\binw\wlib -q
-if "%COMPILER%" == "MSC"    set LIBUTIL=%BASE%\bin\lib /nologo
+if "%COMPILER%" == "WATCOM" set LIBUTIL=%BINPATH%\wlib -q
+if "%COMPILER%" == "MSC"    set LIBUTIL=%BINPATH%\lib /nologo
 if "%COMPILER%" == "MSC"    set LIBTERM=;
 
 echo Librarian is %LIBUTIL%
@@ -47,10 +64,9 @@ echo Librarian is %LIBUTIL%
 
 if not "%MAKE%" == "" goto skip_make
 
-set MAKE=%BASE%\bin\make
-if "%COMPILER%" == "TC"     set MAKE=%BASE%\make
-if "%COMPILER%" == "WATCOM" set MAKE=%BASE%\binw\wmake /ms /h
-if "%COMPILER%" == "MSC"    set MAKE=%BASE%\bin\nmake /nologo
+set MAKE=%BINPATH%\make
+if "%COMPILER%" == "WATCOM" set MAKE=%BINPATH%\wmake /ms /h
+if "%COMPILER%" == "MSC"    set MAKE=%BINPATH%\nmake /nologo
 
 echo Make is %MAKE%
 
@@ -68,6 +84,7 @@ if "%LAST%" == "1" goto end
 set NASM=
 set COMPILER=
 set BASE=
+set BINPATH=
 set TC_BASE=
 set TCPP_BASE=
 set TCPP3_BASE=
@@ -79,6 +96,7 @@ set LIBTERM=
 set MAKE=
 set XUPX=
 set XCPU=
+set XCPU_EX=
 set XFAT=
 set ALLCFLAGS=
 set LOADSEG=
diff --git a/mkfiles/generic.mak b/mkfiles/generic.mak
index 6aae72e..9fe65f1 100644
--- a/mkfiles/generic.mak
+++ b/mkfiles/generic.mak
@@ -12,6 +12,11 @@ CPUOPT=-1
 !if $(XCPU) == 386
 CPUOPT=-3
 !endif
+# extension, if compiler supports it, specify compiler switch in XCPU_EX and set XCPU to 386
+!if $(XCPU_EX)0 != 0
+XCPU=386
+CPUOPT=$(XCPU_EX)
+!endif
 
 !if $(XFAT)0 == 0
 XFAT=32
@@ -23,7 +28,7 @@ NASMFLAGS=-DWITHFAT32 $(NASMFLAGS)
 
 NASMFLAGS=-fobj -i../hdr/ -D$(COMPILER) -DXCPU=$(XCPU) $(NASMFLAGS)
 
-BINPATH=$(BASE)\bin
+#BINPATH=$(BASE)\bin
 INCLUDEPATH=$(BASE)\include
 LIBPATH=$(BASE)\lib
 INITPATCH=@rem
diff --git a/mkfiles/tc.mak b/mkfiles/tc.mak
index 05fa52f..d8bc5c0 100644
--- a/mkfiles/tc.mak
+++ b/mkfiles/tc.mak
@@ -2,8 +2,6 @@
 # TC.MAK - kernel compiler options for Turbo C 2.01
 #
 
-BINPATH=$(BASE)
-
 !include "..\mkfiles\tcpp.mak"
 
 TARGET=KTC
diff --git a/mkfiles/watcom.mak b/mkfiles/watcom.mak
index 23671fe..f771767 100644
--- a/mkfiles/watcom.mak
+++ b/mkfiles/watcom.mak
@@ -4,7 +4,6 @@
 
 TARGET=KWC
 
-BINPATH=$(BASE)\binw
 INCLUDEPATH=$(BASE)\h
 LIBPATH=$(BASE)\lib286
 
diff --git a/utils/wlinker.bat b/utils/wlinker.bat
index 27ae76a..7c7ede2 100755
--- a/utils/wlinker.bat
+++ b/utils/wlinker.bat
@@ -1,4 +1,4 @@
 @echo off
-%BASE%\binw\ms2wlink %1 %2 %3 %4 %5 %6 %7 %8 %9 ,,,, >kernel.lnk
+%BINPATH%\ms2wlink %1 %2 %3 %4 %5 %6 %7 %8 %9 ,,,, >kernel.lnk
 echo op map,statics,verbose,eliminate,vfremoval>>kernel.lnk
-%BASE%\binw\wlink @kernel.lnk
+%BINPATH%\wlink @kernel.lnk