diff --git a/constants/dss_equ.inc b/constants/dss_equ.inc
index bc87adf..8f79506 100644
--- a/constants/dss_equ.inc
+++ b/constants/dss_equ.inc
@@ -177,6 +177,13 @@ Dss:
 .DRV.Write	EQU	#06
 .DRV.Removable	EQU	#07
 .DRV.GenIOCTL	EQU	#08
+.DRV.GenIOCTL.GetParams	EQU	#00*256 + .DRV.GenIOCTL	; Get Device Parameters
+.DRV.GenIOCTL.ReadTrack	EQU	#01*256 + .DRV.GenIOCTL	; Read track
+.DRV.GenIOCTL.TestTRK	EQU	#02*256 + .DRV.GenIOCTL	; Test track
+.DRV.GenIOCTL.SetParams	EQU	#80*256 + .DRV.GenIOCTL	; Set Device Parameters
+.DRV.GenIOCTL.WriteTRK	EQU	#81*256 + .DRV.GenIOCTL	; Write track
+.DRV.GenIOCTL.FormatTRK	EQU	#82*256 + .DRV.GenIOCTL	; Format track
+.DRV.GenIOCTL.Enter	EQU	#55AA			; for DE
  ;.DRV.Reserved	EQU	#09
 .DRV.LongRead	EQU	#10
 .DRV.LongWrite	EQU	#11