diff --git a/DOOM2.asm b/DOOM2.asm
index 89535c4..a109459 100644
--- a/DOOM2.asm
+++ b/DOOM2.asm
@@ -9,15 +9,43 @@ ScreenStartAddress	EQU #C040
 ;ScreenStartAddress	EQU #C000
 ;
 ;---------------------------[Defines section]---------------------------
- DEFINE EXE_HEADER 1
+ DEFINE EXE_HEADER		1
+; 			VERSIONS
+MIN_VER:			; 1.70.887
+.DSS_V			EQU	1		; Version
+.DSS_M			EQU	70		; Modification
+.DSS_B			EQU	887		; Build
+;				; 2.55
+.BIOS_V			EQU	2		; Version
+.BIOS_M			EQU	55		; Modification
+;;;;;;;
+
+;  DEFINE MIN_DSS_VERSION		MIN_VER.DSS_V*256 + MIN_VER.DSS_M
+;  DEFINE MIN_DSS_BUILD		MIN_VER.DSS_B
+;  DEFINE MIN_BIOS_VERSION	MIN_VER.BIOS_V*256 + MIN_VER.BIOS_M
+
+;  DEFINE TXT_DSS_VERSION	('0'+MIN_VER.DSS_V),\
+;  			'.',\
+; 			('0'+MIN_VER.DSS_M/10),\
+; 			('0'+MIN_VER.DSS_M-(MIN_VER.DSS_M/10)*10),\
+; 			'.',\
+; 			('0'+MIN_VER.DSS_B/100),\
+; 			('0'+(MIN_VER.DSS_B/10 - MIN_VER.DSS_B/100*10)),\
+; 			('0'+(MIN_VER.DSS_B - MIN_VER.DSS_B/10*10)) ;
+
+
+;  DEFINE TXT_BIOS_VERSION '0'+MIN_VER.BIOS_V,\
+;  			 '.',\
+; 			 '0'+MIN_VER.BIOS_M/10,\
+; 			 '0'+MIN_VER.BIOS_M-(MIN_VER.BIOS_M/10)*10
 ;-----------------------------------------------------------------------
 ;
 
 
 ;
 ;-----------------------[Compilation parameters]------------------------
-	DEVICE ZXSPECTRUM4096												; модель с 4 метрами памяти
-	MMU 2 e, 0															; нулевая страница в банку 2 и проверка на границы
+	DEVICE ZXSPECTRUM4096	; модель с 4 метрами памяти
+	MMU 2 e, 0		; нулевая страница в банку 2 и проверка на границы
 	OUTPUT './Build/DOOM2/doom2.exe'				
 ;-----------------------------------------------------------------------
 ;
@@ -72,7 +100,9 @@ CMD_Line+1:
 	LD HL,#8080
 	CALL	SET_HOME_PATH
 ;--------[загрузка ресурсов игры]-------
-	LD	HL,Loading_TXT
+	CALL	CHECK_SYSTEM
+	;
+	LD	HL,MESSAGES_TXT.Loading
 	LD	C,Dss.PChars 
 	RST	ToDSS
 	;
@@ -199,11 +229,12 @@ RETURN_POINT:
 	;
 	CALL	RESTORE_ALL
 	;
-	LD	HL,GOTO_EXIT
+	LD	HL,MESSAGES_TXT.NormExit
 	LD	C,Dss.PChars 
 	RST	ToDSS
 	;
-.loop:	LD	BC,Dss.Exit
+.loop:	LD	B,0
+.error:	LD	C,Dss.Exit
 	RST	ToDSS
 	JR	.loop
 ;---------------------------------------
@@ -1817,8 +1848,44 @@ SCREEN_IN_CACHE:
 	OUT	(SYS_PORT.OFF),A
 	RET
 ;***********************************************************************
+CHECK_SYSTEM:
+	_mCHECK_SYS_VERSIONS MIN_VER.DSS_V, MIN_VER.DSS_M, MIN_VER.DSS_B, MIN_VER.BIOS_V, MIN_VER.BIOS_M
+
+; 	LD	C,Dss.Version
+; 	RST	ToDSS
+; 	JR	C,.Error_DOS
+; 	LD	HL,MIN_DSS_VERSION
+; 	EX	DE,HL
+; 	SBC	HL,DE
+; 	JR	C,.Error_DOS
+; 	;
+; 	LD	HL,-(MIN_DSS_BUILD)
+; 	ADD	HL,BC
+; 	JR	NC,.Error_DOS
+; 	;
+; 	LD	C,BIOS.DRV_VERSION
+; 	RST	ToBIOS
+; 	JR	C,.Error_BIOS
+; 	LD	HL,-(MIN_BIOS_VERSION)
+; 	ADD	HL,DE
+; 	RET	C
+; .Error_BIOS:
+; 	LD	HL,.Error_BIOS
+; 	JR	.next
+; .Error_DOS:
+; 	LD	HL,.Error_DSS
+; .next:	LD	C,Dss.PChars 
+; 	RST	ToDSS
+; 	;
+; 	LD	B,DSS_Error.sys.COMMON_ERROR
+; .error:	LD	C,Dss.Exit
+; 	RST	ToDSS
+; 	JR	.loop
+; .Error_BIOS:	DB "\r\nERROR! Uncompatible version of BIOS. Needs version ",TXT_BIOS_VERSION," or higher.\r\n",0
+; .Error_DSS:	DB "\r\nERROR! Uncompatible version of DSS. Needs version ",TXT_DSS_VERSION," or higher.\r\n",0
+;***********************************************************************
 ;---------------[Tables]----------------
-				ALIGN 2,0
+	ALIGN 2,0
 ;
 TABLES_START:
 X_COORD:	DW 90*256
@@ -1845,31 +1912,14 @@ NAME6:		DB "94956C  CBL     "
 NAME7:		DB "_ENI511CCBL     "
 ;
 SND_DIR:	DZ "MUSIC"
-;Up_Dir:			DZ ".."
-;
-Loading_TXT:	DZ "\r\nPlease wait, resources are loading..."
-GOTO_EXIT:	DZ "\r\n	< GAME OVER))) >"
-;
-;  IFN NORM_syncPORT
-
-; im_handler_emul_proc_address:
-; 	di
-; 	push af
-; 	call KBD_INT
-; 	pop af
-; 	reti
-
-; 	BLOCK +(#FF - low $)
-; im_handler_emulator:
-; 	 dw im_handler_emul_proc_address
-;  ENDIF
 ;
+MESSAGES_TXT:
+.Loading:	DZ "\r\nPlease wait, resources are loading...\r\n"
+.NormExit:	DZ "DOOM 2 demo for DSS says goodbye to you...\r\n"
+;-----------------------------------------------------------------------;
 	OUTEND								; конец файла doom2.exe
 ;-----------------------------------------------------------------------;
 
-;------------------------------------
-;CURRENT_DIR:	BLOCK 257,0
-
 ;------------------------------------
 Temp_Buffer		EQU $
 TXT_SCREEN		EQU Temp_Buffer + 257
diff --git a/Shared_Includes b/Shared_Includes
index b8a215d..c9539a1 160000
--- a/Shared_Includes
+++ b/Shared_Includes
@@ -1 +1 @@
-Subproject commit b8a215d38afde3eed48f39eb961e96cdb6d9e426
+Subproject commit c9539a188d91551738e666770744c6007f0e5b01