diff --git a/constants/BIOS_equ.inc b/constants/BIOS_equ.inc
index 63148fc..1c08130 100644
--- a/constants/BIOS_equ.inc
+++ b/constants/BIOS_equ.inc
@@ -187,6 +187,19 @@ Error:						;
 .Write			EQU	10		;
 .Failure		EQU	11		;
 .Busy			EQU	12		; DEVICE OPENED
+;	ATAPI ERRORS
+.NoSence		EQU	#70
+.RecoveredError		EQU	#71
+.NotReady		EQU	#72
+.MediumError		EQU	#73
+.HardwareError		EQU	#74
+.IllegalRequest		EQU	#75
+.UnitAttention		EQU	#76		; MediaChanged	
+.DataProtect		EQU	#77	
+.AbortedCommand		EQU	#7B
+.Miscompare		EQU	#7E
+.TimeOut		EQU	#80
+;
 .NotSupported		EQU	#AA		;
 Error.EMM:					;
 .InvalidBlockID		EQU	0		;