diff --git a/Source/cbios.asm b/Source/cbios.asm
index 238edc8d..ec20f6cc 100644
--- a/Source/cbios.asm
+++ b/Source/cbios.asm
@@ -1792,24 +1792,18 @@ DSK_CNT	.EQU	DPH_CNT
 ;
 ;	MAP LOGICAL TO PHYSICAL DEVICES
 ;
-#IF (PLATFORM == PLT_N8)
-TTYDEV	.EQU	CIODEV_ASCI
-#ELSE
-TTYDEV	.EQU	CIODEV_UART
-#ENDIF
-;
-LD_TTY	.EQU	TTYDEV
+LD_TTY	.EQU	DEFCON
 LD_CRT	.EQU	CIODEV_CRT
 LD_BAT	.EQU	CIODEV_BAT
-LD_UC1	.EQU	TTYDEV
-LD_PTR	.EQU	TTYDEV
-LD_UR1	.EQU	TTYDEV
-LD_UR2	.EQU	TTYDEV
-LD_PTP	.EQU	TTYDEV
-LD_UP1	.EQU	TTYDEV
-LD_UP2	.EQU	TTYDEV
-LD_LPT	.EQU	TTYDEV
-LD_UL1	.EQU	TTYDEV
+LD_UC1	.EQU	DEFCON
+LD_PTR	.EQU	DEFCON
+LD_UR1	.EQU	DEFCON
+LD_UR2	.EQU	DEFCON
+LD_PTP	.EQU	DEFCON
+LD_UP1	.EQU	DEFCON
+LD_UP2	.EQU	DEFCON
+LD_LPT	.EQU	DEFCON
+LD_UL1	.EQU	DEFCON
 ;
 #IF (PLATFORM == PLT_N8)
 LD_UC1	.SET	CIODEV_ASCI + 1