15 Aug
1999
15 Aug
'99
12:25 p.m.
< How did the old light-pens or the light-gun with Atari 8-bits work ?
<Weren't they related to this sensitivity of the CRT ?
Light pens were fast photo diode that did coincidence detection with a scan
line that was bright. The logic in the video board(or chip) would map the
"hit" to a scan line address... the rest was programming in the form of what
was at that spot and was it a "button". Very simple device save for there
were timing delays to be compensated for.
Allison