Posted By
MMS
on 2024-10-28
15:11:30
 |  Re: Joystick Pinout descriptions - LightPen ?
@SukkoPera thank you , it would be great!
BTW I am more or less sure,that the Lightpen listed there is not a lightpen.
Because there was no such a thing on PC as RS232 lightpen.
-CGA, MDA and even few EGA cards had light pen connection, but a 6 pin simple one (not RS232),
-even the IBM PCjr had a built-in light pen support and connector, but also only a 6 pin very simple connector.
You can see it here. ( This is Sparta!  )
https://cdm.link/8-bit-painting-watch-a-diy-light-pen-for-the-ibm-pcjr/
I found nowhere a RS232 DB9 based Light Pen for PC, so it is more probably a barcode reader or something like that.
Also, watching again @George video, I noticed that Trojan pen also seems do not have a button.
You put it at the position and wait to pick.
I am curious, why it took so much time for the pen to pick a position, as the screen scanned 50 times in a second, so the recognition of the position should happen in miliseconds, but surely not for 1-2 seconds as I saw.
Do you have any idea? Maybe the black background George used made the phototransistor less sensitive? Maybe a white background would do the job?
The Amiga Trojan Light Pen could be used instead of mouse (at least for some seconds  )
https://www.youtube.com/watch?v=WxQgoeyoWaA
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