Xref: utzoo comp.sys.ibm.pc:18246 comp.protocols.tcp-ip.ibmpc:741 Path: utzoo!utgpu!water!watmath!clyde!att!pacbell!ames!amdcad!sun!pitstop!sundc!seismo!uunet!mcvax!ukc!eagle!icdoc!ist!olgb1!slxsys!jpp From: jpp@slxsys.specialix.co.uk (John Pettitt) Newsgroups: comp.sys.ibm.pc,comp.protocols.tcp-ip.ibmpc Subject: Re: Mapping ETHERNET to COM(n) Message-ID: <224@slxsys.specialix.co.uk> Date: 18 Aug 88 07:27:30 GMT References: <142@pbseps.UUCP> Organization: Specialix International, London, UK. Lines: 43 From article <142@pbseps.UUCP>, by rdp@pbseps.UUCP (Richard Perlman): > I am looking for a program/patch/utility that would allow me to > use IBM-PC software (i.e. Crossstalk, MS-Windows, Symphony etc.) > with a psuedo port on an ethernet instead of the expected > standard serial port COM(1,2). I want to "talk" with a tcp/ip > host (running NFS if that matters). > > The sysem is a standard IBM-PC/XT with a Western Digital WD8003E > ethernet board. The short answer is that it can't be done ! Most dos comms programs use some inbuilt driver that bit twiddles the uart (com1 or com2) directly, your ethernet virtual port would have to be a full hardware level emulation of a 16450 uart. This is a common problem, we make intelligent serial cards for PC/AT type boxes and have a similar problems: We don't look like a uart so the software wont talk to us. There are two solutions that I know of: 1) ASCOM - sorry don't know the authors - will let you write your own uart interface. 2) 386 virtual 8086 mode, i.e. fake a uart in software (n.b. this is not simple :-) > > -- > Richard Perlman * pbseps!rdp@PacBell.COM || {ames,sun,att}!pacbell!pbseps!rdp > 180 New Montgomery St. rm 602, San Francisco, CA 94105 |*| (415) 545-0233 John Pettitt Specialix International -- John Pettitt, Specialix, Giggs Hill Rd, Thames Ditton, Surrey, U.K., KT7 0TR {backbone}!mcvax!ukc!pyrltd!slxsys!jpp jpp@slxsys.specialix.co.uk Tel: +44-1-398-9422 Fax: +44-1-398-7122 Telex: 918110 SPECIX G >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<