diff --git a/constants/SP2000.inc b/constants/SP2000.inc
index 8cd0d9f..daa560d 100644
--- a/constants/SP2000.inc
+++ b/constants/SP2000.inc
@@ -1518,15 +1518,16 @@ HOLD            EQU #CB                                                 ; 
 ;#DE - vRAM page for 512 kb (окно C000-FFFF)
 ;#DF - vRAM page for 512 kb (окно C000-FFFF)
 
-;#E0 - vROM page EXPANSION                                              ; Port #1FFD bit1=1 (#24 bit6=0, bit0=0)
-;#E1 - vROM page TR-DOS                                                 ; PC = #3D00..#3DFF and #1FFD bit1=0 (#24 bit0=0)
-;#E2 - vROM page BASIC-128                                              ; #7FFD bit4=0 and #1FFD bit1=0 (#24 bit0=0)
-;#E3 - vROM page BASIC-48                                               ; #7FFD bit4=1 and #1FFD bit1=0 (#24 bit0=0)
+vROM:
+.BIOS:		EQU #E0		;vROM page EXPANSION.	Port #1FFD bit1=1 (#24 bit6=0, bit0=0)
+.TR_DOS:	EQU #E1		;vROM page TR-DOS.	PC = #3D00..#3DFF and #1FFD bit1=0 (#24 bit0=0)
+.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)
 
-;#E4 - vROM page EXPANSION 2                                            ; Port #1FFD bit1=1 (#24 bit6=0, bit0=1)
-;#E5 - vROM page TR-DOS    2                                            ; PC = #3D00..#3DFF and #1FFD bit1=0 (#24 bit0=1)
-;#E6 - vROM page BASIC-128 2                                            ; #7FFD bit4=0 and #1FFD bit1=0 (#24 bit0=1)
-;#E7 - vROM page BASIC-48  2                                            ; #7FFD bit4=1 and #1FFD bit1=0 (#24 bit0=1)
+.BIOS_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)
 
 SLOT0           EQU #E8                                                 ; RAM page (окно 0000-3FFF)
 SLOT1           EQU #E9                                                 ; RAM page (окно 4000-7FFF)