diff --git a/branches/s100/Source/std.asm b/branches/s100/Source/std.asm
index 2c960e09..9dfc86d8 100644
--- a/branches/s100/Source/std.asm
+++ b/branches/s100/Source/std.asm
@@ -65,12 +65,12 @@ CIODEV_UART	.EQU	$00
 ;CIODEV_VDU	.EQU	$20
 ;CIODEV_CVDU	.EQU	$30
 ;CIODEV_UPD7220	.EQU	$40
-CIODEV_N8V	.EQU	$50
+;;CIODEV_N8V	.EQU	$50
 ;CIODEV_PRPCON	.EQU	$60
 ;CIODEV_PPPCON	.EQU	$70
-CIODEV_CRT	.EQU	$D0
+;CIODEV_CRT	.EQU	$D0
 ;CIODEV_BAT	.EQU	$E0
-CIODEV_NUL	.EQU	$F0
+;CIODEV_NUL	.EQU	$F0
 
 ;
 ; DISK DEVICES (ONLY FIRST NIBBLE RELEVANT, SECOND NIBBLE RESERVED FOR UNIT)