Anyone familiar with these vintage touchscreens?

[John Foust]

At 11:51 AM 10/21/2019, Tony Duell wrote:
>> Theinfrared array you're thinking of was invented at PLATO, for flat panel (plasma) displays.  They don't work for CRTs because of the convex screen.
>
>My HP150 will have to disagree with you there.

<https://en.wikipedia.org/wiki/HP-150#/media/File:Hp150_touchscreen_20081129.jpg>https://en.wikipedia.org/wiki/HP-150#/media/File:Hp150_touchscreen_20081129.jpg 

- John