Article View: comp.sys.ibm.pc.misc
Article #9134Re: Interrupt sharing
From: Nur Iskandar Taib
Date: Thu, 11 Apr 1991 14:12
Date: Thu, 11 Apr 1991 14:12
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>However, is it possible to let two devices (in particular >a serial port and a parallel port) share an interrupt >line without the risk of damaging the computer's hardware? >Although not particularly well informed in this area, I could >imagine a scenario with one device raising the signal and >the other one lowering it, causing a "short circuit" between >+5 volts and 0 volts, or am I way off here? I always thought the computer's bus uses assertion- level logic, i.e. if one device causes a line to go high, the line will go high no matter what the other devices on that line are doing. The equivalent of a logical multi input OR. Assertion level logic devices require a terminator resistor between the line and ground. -- ------------------------------------------------------------------------------- Iskandar Taib | The only thing worse than Peach ala Internet: NTAIB@AQUA.UCS.INDIANA.EDU | Frog is Frog ala Peach Bitnet: NTAIB@IUBACS ! -------------------------------------------------------------------------------
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arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!sdd.hp.com!spool.mu.edu!news.cs.indiana.edu!bronze!silver!ntaibReferences:
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!sdd.hp.com!spool.mu.edu!news.cs.indiana.edu!bronze!silver!ntaib From: ntaib@silver.ucs.indiana.edu (Nur Iskandar Taib) Newsgroups: comp.sys.ibm.pc.misc Subject: Re: Interrupt sharing Message-ID: <1991Apr11.141212.11816@bronze.ucs.indiana.edu> Date: 11 Apr 91 14:12:12 GMT References: <1991Apr8.170234.24810@lth.se> Sender: news@bronze.ucs.indiana.edu (USENET News System) Organization: Indiana University, Bloomington Lines: 22