Path: utzoo!mnetor!uunet!husc6!mailrus!ames!pasteur!ucbvax!VAX.FTP.COM!jbvb
From: jbvb@VAX.FTP.COM (James Van Bokkelen)
Newsgroups: comp.protocols.tcp-ip.ibmpc
Subject: Re: Printing with TN3270
Message-ID: <8804010543.AA21900@vax.ftp.com>
Date: 1 Apr 88 05:43:52 GMT
References: <8803312152.aa11655@Louie.UDEL.EDU>
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 14

As I understand the handling of an attached printer on a real 3270 (which
isn't perfectly), the mechanism used to send the screen image to the
printer is at the SNA or BSC level, rather than at the 3270 data stream
level.  The printer is another SNA or BSC device, and is subject to all
the polling, etc. that that implies.  Because TN3270 operates at the
3270 data stream level, and doesn't run SNA or BSC over the Telnet
connection (the polling would be far, far worse than keepalives), there
doesn't seem to be much chance of implementing a 328x emulation.

Any IBM types understand exactly how IMS would try to request a 'Copy'?
How would the UCLA ACP (for MVS) or Wiscnet (if you can run IMS on VM)
deal with the request?  What might it decide to send out the TCP connection?

jbvb