Date: Thu, 14 Mar 2002 08:40:07
From: "neil barnes" <[EMAIL PROTECTED]>
Subject: Re: [LIB] Touchscreens for Librettos - alternatives

>Date: Thu, 14 Mar 2002 09:39:53 +0800
>From: Raymond <[EMAIL PROTECTED]>
>Subject: Re: [LIB] Touchscreens for Librettos - alternatives
>
>At 08:20 AM 13/03/2002 -0800, you wrote:
> >Date: Wed, 13 Mar 2002 16:11 +0000
> >From: [EMAIL PROTECTED]
> >Subject: Re: [LIB] Touchscreens for Librettos - alternatives
> >
> >Hi, all,
> >other alternatives are light pens, to turn any display into a touchscreen 
>system.
>
>Umm ... AFAIK light pens won't work on LCD displays because there is no 
>raster to key onto.

That's my thought, too - they take a raster input but once the cell is 
switched it stays there till the next refresh.

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