From 1985 - HP 150 TouchScreen goes for >$400 !

[Joe R.]

At 12:55 AM 5/19/05 +0100, you wrote:
>> I think I have the touchscreen frame from one of those, 4 circuit
>> boards linked together in a box, with a lots of LEDs and
>> phototransistors.  Always been curious what it came out of.
   >
>Quite possibly, that's how the touchscreen worked on the 150.
>

   It was also a option in one of the terminals but I forget which one. I
have a loose board of LED/Phototransistors that I found was used to
retrofit Touchscreen capability into one of the terminals.

   Joe