9 Nov
1998
9 Nov
'98
12:53 p.m.
Date: Tue, 10 Nov 1998 00:29:33 +0000 (GMT)
How does a light pen work?
>
> Not to change the subject but has anybody ever seen the light pen
for
> the PCJr? I've read in the PCJr literature
that it was supposed to
be
available but
haven't known of anybody having seen or used one.
Well, there's a light pen port on the back, but I have no other real it. I could find out the pinout if anyone wants to try
building one.
Mind you, there's a light pen connector on the original CGA card. And a
similar one on the MDA card with the right signals. The latter,
however,
is known not to work with the 5151 monitor as said CRT
has too long a
persistance.
Again I can find pinouts/signal details.
I seem to recall there being a circuit for a Tandy 1000 lightpen in
80-micro in about 1986. I suspect that would work with all the above
systems.
-tony
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