21 Oct
2019
21 Oct
'19
9:58 a.m.
At 11:51 AM 10/21/2019, Tony Duell wrote:
<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
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.