Game port information (was Re: IRQ2 or IRQ5)

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#1103

From: Tomi H Engdahl
Date: Sun, 10 Jan 1993 10:08

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In article <1993Jan9.124633.19036@mnemosyne.cs.du.edu> istuart@nyx.cs.du.edu (Ian Stuart) writes:

>What IRQ is the game-port on?

Game port does not have any IRQ line. It is just a simple polled
device. It has just I/O address 201h, which you can read and write.
Writing to that address resets the flip-flop timers in the card, which
are used for measuring the state of the joystick potentiometers.
By reading the card you get the state of the buttons and flip-flops.



--
Tomi.Engdahl@hut.fi    !  LOWERY'S LAW:
then@snakemail.hut.fi  !  "If it jams - force it. If it breaks,
                       !   it needed replacing anyway."

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References: <1993Jan7.122713.17450@walter.cray.com> <1993Jan9.124633.19036@mnemosyne.cs.du.edu>

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Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!news.funet.fi!ajk.tele.fi!funic!sauna.cs.hut.fi!news.cs.hut.fi!then
From: then@snakemail.hut.fi (Tomi  H Engdahl)
Newsgroups: alt.msdos.programmer,comp.msdos.programmer,comp.os.msdos.programmer,comp.sys.ibm.pc.programmer
Subject: Game port information (was Re: IRQ2 or IRQ5)
Date: 10 Jan 93 10:08:14 GMT
Organization: Helsinki University of Technology, Finland
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Distribution: inet
Message-ID: <THEN.93Jan10120814@lk-hp-17.hut.fi>
References: <1993Jan7.122713.17450@walter.cray.com>
 <1993Jan9.124633.19036@mnemosyne.cs.du.edu>
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In-reply-to: istuart@nyx.cs.du.edu's message of Sat, 9 Jan 93 12:46:33 GMT

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