Path: utzoo!attcan!telly!problem!compus!lethe!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!hellgate.utah.edu!caen!sdd.hp.com!news.cs.indiana.edu!news.nd.edu!mentor.cc.purdue.edu!descartes.math.purdue.edu!wilker From: wilker@descartes.math.purdue.edu (Clarence Wilkerson) Newsgroups: sci.electronics Subject: Re: IBM Keyboard Output Message-ID: <6215@mentor.cc.purdue.edu> Date: 18 Feb 91 21:50:03 GMT References: <1991Feb18.185444.7021@uhura.neoucom.EDU> <1991Feb17.065421.27814@athena.cs.uga.edu> Sender: news@mentor.cc.purdue.edu Reply-To: wilker@descartes.math.purdue.edu (Clarence Wilkerson) Distribution: sci Lines: 5 In an XT, the receiving of keyboard input is done in software, reading from a 8255 parallel port rigged to receive a serial with sync line. If you read the xt technical manual, you'll find both hardware and software details. AT's have a dedicated controller. Clarence Wilkerson Brought to you by Super Global Mega Corp .com