diff --git a/constants/dss_equ.inc b/constants/dss_equ.inc
index 68fda28..67482fa 100644
--- a/constants/dss_equ.inc
+++ b/constants/dss_equ.inc
@@ -167,6 +167,8 @@ Dss:
 ;
 ;       Video
 .SetVMod        EQU     #50
+.SetVMod.Screen_0	EQU	0*256+.SetVMod
+.SetVMod.Screen_1	EQU	1*256+.SetVMod
 .SetVMod.txt40x32	EQU	2	; текстовый 40x32x16 цветов
 .SetVMod.txt80x32	EQU	3	; текстовый 80x32x16 цветов
 .SetVMod.grf320x256	EQU	#81	; графический 320x256x256 цветов