diff --git a/constants/BIOS_equ.inc b/constants/BIOS_equ.inc
index 3d875cb..a78b49e 100644
--- a/constants/BIOS_equ.inc
+++ b/constants/BIOS_equ.inc
@@ -146,6 +146,8 @@ SET_PORTS		EQU	#F8		; 
 READ_PORTS		EQU	#F9		; Чтение внутренних портов. ;[x] 26/01/2024
 GOTO_SPECTRUM		EQU	#FB		; [ ] доковырять
 ZX_MEMORY_MANAGER	EQU	#FC		; [ ] free zx pages!
+.FreeZXvPages			EQU	#40FC
+;
 .MODE_48k			EQU	3
 .MODE_128k			EQU	3+5
 .MODE_256k			EQU	3+13