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From: P85025@BARILVM.BITNET (Doron Shikmoni)
Newsgroups: comp.protocols.ibm
Subject: Re: 3270 ATTN key -- what does it generate?
Message-ID: <9012181142.AA25279@lilac.berkeley.edu>
Date: 18 Dec 90 10:04:31 GMT
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Reply-To: Doron Shikmoni <P85025%BARILVM.BITNET@lilac.berkeley.edu>
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In article <1990Dec15.014654.28204@naitc.naitc.com>, Karl Denninger
<ddsw1!bbs!karl@GARGOYLE.UCHICAGO.EDU> says:
>Any help appreciated greatly.... If someone knows just what is generated
>when an ATTN key is pressed, that is probably enough.

It's more complicated than that, unfortunately. ATTN is a feature of
SNA controllers. 3270 emulation via TCP/IP emulates a non-SNA terminal
(regular, local 3270). On such machines, ATTN is not defined at all
(if you press ATTN on a 3270 attached to a local non-SNA controller,
you get X-F - function not supported). In SNA controllers, ATTN generates
a special interrupt RU - an SNA frame.

Doron