Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/5/84; site mnetor.UUCP
Path: utzoo!utcs!mnetor!clewis
From: clewis@mnetor.UUCP (Chris Lewis)
Newsgroups: net.wanted
Subject: Re: IBM 3270 Emulation under Un*x
Message-ID: <1047@mnetor.UUCP>
Date: Wed, 19-Jun-85 08:37:01 EDT
Article-I.D.: mnetor.1047
Posted: Wed Jun 19 08:37:01 1985
Date-Received: Wed, 19-Jun-85 09:32:57 EDT
References: <545@rlvd.UUCP> <1023@mnetor.UUCP> <1484@watdcsu.UUCP>
Reply-To: clewis@mnetor.UUCP (Chris Lewis)
Organization: Computer X (CANADA) Ltd., Toronto, Ontario, Canada
Lines: 32
Summary: 

In article <1484@watdcsu.UUCP> herbie@watdcsu.UUCP (Herb Chong [DCS]) writes:
>In article <1023@mnetor.UUCP> clewis@mnetor.UUCP (Chris Lewis) writes:
>>	2) There is at least two systems that are run on the IBM mainframe
>>	   that make ordinary dumb terminals look like 3278's (ideal
>>	   for dialup use without having to have remote clusters).  I can
>>	   only remember one of them:
>... etc. ...
>
>the other is the Yale IUP available both from Yale University and IBM.

Thanks for the info.  Is that the one that IBM promotes for their
customers?  (Eg: is this the one that VM/IX requires?)

>it requires a series/1 frontend to act as a 3274 or 3276 terminal
>controller, but appears to the VM system as a real 3277 or 3278
>...
>
>Yale is an expensive alternative but requires the least amount of
>resources on the IBM mainframes.  ...

I think Herb means CPU "resources".  SIM3270 only needs the standard
ASCII => IBM hardware (a 3705 and/or COMTEN etc.).  So, if you already have
ASCII terminal access, SIM3270 is a lot cheaper, but may impose some
added IBM CPU penalties because it uses a separate virtual machine to handle
the terminals.  I think that the performance impact on the BNR system 
(3033 with 250+ simultaneous users) was slight to insignificant - but
not all that many people used it simultaneously.  Anybody contemplating
either will have to do their own evaluation.
-- 
Chris Lewis,
UUCP: {allegra, linus, ihnp4}!utzoo!mnetor!clewis
BELL: (416)-475-8980 ext. 321