From: tkerran@skyhawk.ecn.uoknor.edu (Tyler Kerran)
Newsgroups: rec.photo
Subject: High-Speed Photography
Date: 16 Oct 92 05:13:29 GMT
Article-I.D.: constell.1992Oct16.051329.26719
Organization: Engineering Computer Network, University of Oklahoma, Norman, OK, USA


I am involved in high-speed photography research.  Particularly involving
computers to control the firing sequences of flashes.  I currently use an
Apple IIe to do this,  however,  I would like to use an IBM PC.  I have heard
that this is possible through the parallel printer port becuase unlike the
Apple,  the IBM game port does not have any annunciators that are capable
of firing a flash.  Does anyone have any information regarding this?

Also,  I am always looking for innovative ways to fire flashes without
using a computer.  These include infrared photogates and timer circuits.
If anyone has any ideas or actual working circuits,  I am certainly 
interrested.

One other thing,  I can currently control four flashes with my Apple
(it has four annunciator outputs),  however I know that it is possible to
control up to fifteen flashes.  Binary logic says that sixteen different
combinations are possible with four inputs,  one of them being zero.
Does anyone know of a circuit that will perform the switching necessary to
control fifteen individual flashes?  Please note that this cannot be     
accomplished by a computer program,  it must be an actual digital circuit.

Please send all questions and comments via EMAIL to:
   
          tkerran@mailhost.ecn.uoknor.edu


P.S.  Does anyone have any NEW and INNOVATIVE ideas for
        high-speed photographs?

Newsgroups: rec.photo
Subject: High-Speed Photography
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Distribution: world
Organization: Engineering Computer Network, University of Oklahoma, Norman, OK, USA
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I am involved in high-speed photography research.  Particularly involving
computers to control the firing sequences of flashes.  I currently use an
Apple IIe to do this,  however,  I would like to use an IBM PC.  I have heard
that this is possible through the parallel printer port becuase unlike the
Apple,  the IBM game port does not have any annunciators that are capable
of firing a flash.  Does anyone have any information regarding this?

Also,  I am always looking for innovative ways to fire flashes without
using a computer.  These include infrared photogates and timer circuits.
If anyone has any ideas or actual working circuits,  I am certainly 
interrested.

One other thing,  I can currently control four flashes with my Apple
(it has four annunciator outputs),  however I know that it is possible to
control up to fifteen flashes.  Binary logic says that sixteen different
combinations are possible with four inputs,  one of them being zero.
Does anyone know of a circuit that will perform the switching necessary to
control fifteen individual flashes?  Please note that this cannot be     
accomplished by a computer program,  it must be an actual digital circuit.

Please send all questions and comments via EMAIL to:
   
          tkerran@mailhost.ecn.uoknor.edu


P.S.  Does anyone have any NEW and INNOVATIVE ideas for
        high-speed photographs?
Newsgroups: rec.photo