diff --git a/constants/BIOS_equ.inc b/constants/BIOS_equ.inc
index a1cf7dc..3d875cb 100644
--- a/constants/BIOS_equ.inc
+++ b/constants/BIOS_equ.inc
@@ -146,6 +146,10 @@ 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!
+.MODE_48k			EQU	3
+.MODE_128k			EQU	3+5
+.MODE_256k			EQU	3+13
+.MODE_512k			EQU	3+29
 REINIT			EQU	#FD		; [x] restart, soft/hard reset, reinit RAM ID for spectrum pages 
 .RESTART			EQU #01FD	;
 .SOFT_RESET			EQU #02FD	;