Scott Baret escribió:
One of the Classics has some kind of video output port
on it. It went to a projector at one time. No idea
what happened to the projector but I think a co-worker
donated it to charity. If anyone else has seen one of
these let me know...I could project something like
MacDraw for covering stuff like area and perimeter. If
I expand to cover middle school I could also do the
Cartesian Plane through a HyperCard stack I found.
First, though, I would need to find the correct type
of projector. It uses a connector similar to a CGA
monitor on a PC but the CGA monitor that I plugged
into it (which works) didn't produce a stable image.
Maybe I need some software.
My guess is that it may be an EGA video connector. EGA and CGA monitors
use the same pinouts and are electrically compatible, the only
difference being that EGA ones support both CGA's 200 lines video modes
and EGA's higher-resolution 350 lines modes, so it would explain why you
got an unstable image.
EGA monitors are able to show 350 visible lines at 60 frames per second,
close enough to the 342 lines, 60 frames generated by all b&w compacts
(only a bit more than 2% difference!), so in theory, an unmodified EGA
monitor should be able to take the video signal from a compact's logic
board connector, perhaps having only to invert the synchronism signals
polarities (I don't have the specs at hand).
Greetings,
Antonio Rodríguez (Grijan)
<ftp://grijan.cjb.net:21000/>
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