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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!news.bhp.com.au!mel.dit.csiro.au!munnari.OZ.AU!news.ecn.uoknor.edu!news.cis.okstate.edu!news.ksu.ksu.edu!news.physics.uiowa.edu!math.ohio-state.edu!howland.reston.ans.net!gatech!newsfeed.internetmci.com!btnet!bt!usenet From: paulg@ (Paul Glennon) Newsgroups: comp.unix.bsd.freebsd.misc Subject: AST/4 Comm Card Performance Date: 30 Jan 1996 01:00:31 GMT Organization: BT plc. Lines: 19 Message-ID: <4ejqjf$dbt@pheidippides.axion.bt.co.uk> Reply-To: glennon_p@tpc.bt.co.uk NNTP-Posting-Host: meadows.ctfec.lon.bt.com Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Newsreader: IBM NewsReader/2 v1.9d - NLS Hi, I have installed an AST/4 clone card but I am unable to get it work above 9600 without giving silo errors. I can get sio1/COM2 to work at 57600 (modem limitation) without a problem (sio0 connects the mouse). sio0/1 are part of a multi I/O card, sio2-5 are on the AST/4 clone card. Both cards use/recognise 16550A UARTs. I would have thought the AST card involved a few extra instructions to read the interupt vector and branch to the code to service the UART which caused the IRQ request. I am using Kermit 5A(190) and setting the port to /dev/cuaa'x', my machine has a DX280 CPU with 16M of RAM and would thought it could have coped using the fifoed UARTs. Any advice or pointers would be most welcome. TIA, Paul.