Posted By
Chicken
on 2016-03-11
13:33:49
 |  Re: Light pen and TED
SVS:
The TROJAN and OPTELPEN lightpens have to be connected to the joyport, that's right. Since the OPTELPEN works with the TROJAN software, both lightpens can be considered "compatible". However, the OPTELPEN got a much better review. Though, the lacking software support was pointed out.
Anyway, "drawing" with the TROJAN software is not like doodling with a pen on screen. The procedure described in the review makes it sound anything but easy.
It's not really clear (to me) how the vertical check works (the review mentions raster interrupts but it's rather vague). The horizontal check involves some routine in char mode that creates horizontally moving black bars on screen. When these reach the lightpen's position (with the TROJAN lightpen it's not working all the time), the horizonal position is set. It's like a pressed fire button (or a pressed key).
I'd really like to see Lavina's lightpen in action, e. g. drawing something on screen.
About the TROJAN review …
The funny part is when the author describes how he's barely able to draw a stick figure with the software and then wonders how they dared to call it "CADMASTER" 
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