diff --git a/Source/HBIOS/duart.asm b/Source/HBIOS/duart.asm
index 7b03fd93..f49182be 100644
--- a/Source/HBIOS/duart.asm
+++ b/Source/HBIOS/duart.asm
@@ -72,7 +72,7 @@
 ;
 DUART_DEBUG		.EQU	FALSE
 ;
-DUART_NONE		.EQU	0		; UNKNOWN OR NOT PRESETN
+DUART_NONE		.EQU	0		; UNKNOWN OR NOT PRESENT
 DUART_2681		.EQU	1		; OLD '681 WITHOUT IVR/GPR
 DUART_26C92		.EQU	2		; '92 WITH MR0
 DUART_XR88C681		.EQU	3		; EXAR/MAXLINEAR CHIP WITH Z-MODE