diff --git a/constants/dss_equ.inc b/constants/dss_equ.inc
index 8f79506..dfd7a44 100644
--- a/constants/dss_equ.inc
+++ b/constants/dss_equ.inc
@@ -40,7 +40,9 @@ Dss:
 ; выход: A - номер последнего лог. диска в системе
 .RescanDrives   EQU     #08
 
-.BootDSK        EQU     #09
+.BootDSK	EQU	#09
+.BootDSK.Get		EQU	0
+.BootDSK.Set		EQU	1
 ;
 ;       File i/o
 .Create         EQU     #0A