anthes@geocub.UUCP (Franklin Anthes) (11/10/88)
I have written an interactive audio-visual program using a PC-XT,
coupled with a videodisk and a digitized sound card. The spectator
interacts with the audio-visual program through a specialized
vandal-proof keyboard, which has no moving pieces, and therefore
no tactile feedback.
The problem is that spectator can unwittingly (sp?), or wittingly:-),
send large amounts of characters to the PC. Once the keyboard buffer
overflows the computer starts emitting a beeping sound, and my
program grinds almost to a halt. This of course wreaks havoc with
the audio-visual, since it relies highly on synchronisation between
the videodisc and the digitized sound!
What I tried to do was replace the keyboard interrupt routine, by
a do nothing routine of my own, which I hoped would disable the
keyboard while I wasn't using it. Unfortunately this approach didn't
work (the machine locked up after 2 interactions with the spectator).
Apparently my interrupt routine should read the characters from
the keyboard before throwing them away... I haven't found any
documentation on how to interract with the keyboard on the hardware
level, so for the moment I'm stuck.
Any ideas, suggestions, or source code:-) would be immensely (sp?)
appreciated. BTW I'm using Turbo C 1.5, if that makes any difference?
Bien le bonjour de la France!
Frank Harper
--
Frank Anthes-Harper
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