diff --git a/constants/SP2000.inc b/constants/SP2000.inc
index 067335d..1760ea0 100644
--- a/constants/SP2000.inc
+++ b/constants/SP2000.inc
@@ -250,12 +250,12 @@ ____________________________________________________
 
         Стандартные страницы ОЗУ для образов ПЗУ спектрума:
  Page      Name          Int.Port     Page      Name          Int.Port
-  #42     BASIC 128        #E2     |   ???     ??? ??? ???     #E6
-  #43     BASIC 48         #E3     |   ???     ??? ??? ???     #E7
-  #44     TR-DOS	   #E1     |   ???     ??? ??? ???     #E5
-  #45     BIOS (ZX_EXP)    #E0     |   ???     ??? ??? ???     #E4
-  #46     BIOS_3 (ZX_EXP)  #EB     |
-  #47     BIOS_4 (ZX_EXP2) #EF     |
+  #42     BASIC 128        #E2     |   ???     BASIC_128_2     #E6
+  #43     BASIC 48         #E3     |   ???     BASIC_48_2      #E7
+  #44     TR-DOS	   #E1     |   ???     TR_DOS_2        #E5
+  #45     ZX_EXPANSION	   #E0     |   ???     EXPANSION_2     #E4
+  #46     ZX_BIOS_1        #EB     |
+  #47     ZX_BIOS_2        #EF     |
 
 SYS_PORT:
 bit0 - TURBO: on/off	или BIOS:
@@ -1437,14 +1437,16 @@ vROM:					;
 .BASIC_128:		EQU #E2		; vROM page BASIC-128.		#7FFD bit4=0 and #1FFD bit1=0 (#24 bit0=0)
 .BASIC_48:		EQU #E3		; vROM page BASIC-48.		#7FFD bit4=1 and #1FFD bit1=0 (#24 bit0=0)
 ;					; 
-.EXPANSION_2:		EQU #E4		; vROM page EXPANSION 2.	Port #1FFD bit1=1 (#24 bit6=0, bit0=1)
+.ZX_EXPANSION_2:	EQU #E4		; vROM page EXPANSION 2.	Port #1FFD bit1=1 (#24 bit6=0, bit0=1)
 .TR_DOS_2:		EQU #E5		; vROM page TR-DOS 2.		PC = #3D00..#3DFF and #1FFD bit1=0 (#24 bit0=1)
 .BASIC_128_2:		EQU #E6		; vROM page BASIC-128 2.	#7FFD bit4=0 and #1FFD bit1=0 (#24 bit0=1)
 .BASIC_48_2:		EQU #E7		; vROM page BASIC-48 2.		#7FFD bit4=1 and #1FFD bit1=0 (#24 bit0=1)
-.ZX_BIOS_1			EQU #EB		; vROM page BIOS-3		Port #74 = 0
+;
+.ZX_BIOS_1		EQU #EB		; vROM page BIOS-3		Port #74 = 0
+.ZX_BIOS_2		EQU #EF		; vROM page BIOS-4		Port #74 = 1
+;
 ;#EC - user's memory cell = FF						; сюда можно сохранить нужное значение ;?????
 ;#ED - user's memory cell = 00						; сюда можно сохранить нужное значение ;?????
-.ZX_BIOS_2			EQU #EF		; vROM page BIOS-4		Port #74 = 1
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 SLOT0			EQU #E8						; RAM page (окно 0000-3FFF)
 SLOT1			EQU #E9						; RAM page (окно 4000-7FFF)