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From: rickert@mp.cs.niu.edu (Neil Rickert)
Newsgroups: comp.unix.questions
Subject: Re: Unix accommodating 3278 Terminals
Message-ID: <1991Mar22.000455.10868@mp.cs.niu.edu>
Date: 22 Mar 91 00:04:55 GMT
References: <26320@adm.brl.mil>
Organization: Northern Illinois University
Lines: 25

In article <26320@adm.brl.mil> slayne@redstone-emh2.army.mil ( ASQNC-MIC-IT-TI/Sid Layne) writes:
>Does anyone know of a software package (public or otherwise) for UNIX platforms,
>that will allow an IBM MVS 3278 terminal user the ability to emulate a vt100/220
>terminal after telneting via TCP/IP from MVS to a UNIX platform. I am speaking 
>of the exact oposite of software such as TN3270 that allows terminals in the 
>UNIX world to emulate 3278 devices. Your responses will be greatly appreciated 
>and can be sent to:  

 This probably can't be done.  The vt100 terminal is unbuffered.  Each
keystroke is transmitted immediately.  The 3278 is buffered.  Up to a complete
screenful of data is buffered on the terminal/control unit.  The host doesn't
even see a keystroke until the ENTER key or one of the PF keys or PA keys is
used.  At that time the complete screenful may be transmitted in a block
operation.

 You can use software emulation, as in 'tn3270', to emulate a buffered terminal
with an unbuffered one.  All the emulation software must do is provide the
buffering and screen management.  Going the other way is a little more
difficult, unless you have extra sensory perception built into your CPU.

-- 
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  Neil W. Rickert, Computer Science               <rickert@cs.niu.edu>
  Northern Illinois Univ.
  DeKalb, IL 60115                                   +1-815-753-6940