Re: tn3270 and IBM's TCP/IP for VM/CMS


Alan Crosswell (columbia!cunixc!alan@rutgers.edu)
23 Nov 87 16:10:08 GMT


In article <In article <723@hsi.UUCP> In article <723@hsi.UUCP> stevens@hsi.UUCP (Richard Stevens) writes:
>.... Does anyone know if the current IBM product (which has
>been available only since July 87) is really compatible with tn3270 ??

Yes. In fact, the PC implementation is quite good and includes a nice
utility for selecting your favorite 3270 to PC keyboard mapping. It
also does colors the same way the Yale ASCII IUP (Series-1 stuff which
is these days done by 7171's) does. It doesn't do 3279, but assigns a
different color to each combination of attributes like hilight,
protected, etc. Nobody has done 3279 (yet) since it wasn't until
VM/SP 5 that the "Logical Device Facility" was extended to support the
so-called 3279 extended data streams.

>The IBM Product Sheet that I have also refers to a C language interface
>to allow program access directly to the TCP and UDP protocol boundary.
>Does anyone have any experience with this ?? I'd assume a program
>under VM using this could communicate with a program on the VAX that
>was using a BSD socket ??

They provide a means to roll your own TCP/IP programs. The C library
is simply a stub interface to the VS Pascal library. You get source,
so you can use it as a model for your own program (since everyone
knows you can't write a program just from the docs :-). Vace
Kundakci, the Academic Systems Manager here, has written (and
modified) several clients and servers for things like LPD, Imagen
spooling, FINGER, SMTP/SEND interactive messaging, etc. Join the
IBMTCP-L list distributed by CUNY. Send mail to IBMTCP-L list distributed by CUNY. Send mail to LISTSERV@CUNYVM with
this as the body: "SUBSCRIBE IBMTCP-L My Name".

>Finally, the Product Sheet lists the one-time license charges (from $4k
>to $16k, depending on processor group) but then indicates that the
>source code for this can be obtained for another $350. This low charge
>makes me think the code was developed elsewhere.
>

You are partially right. The PC stuff is based on MIT PCIP with
additional work done by joint studies with CMU and Maryland. The VM
stuff is based on Wiscnet, which was an IBM-funded project at
Wisconsin. Parts of the VM stuff have been adapted from Wiscnet.
Other parts have been totally rewritten (SMTP for example). The
"product" is provided (and supported) by a group within IBM's Research
Division at Yorktown Heights -- not one of the usual product divisions
-- in conjunction with IBM's ACIS (Academic Information Systems)
Independent Business Unit. ACIS is the group that runs the Advanced
Education Program, AEP, which many schools are beneficiaries of.

> Richard Stevens
> Health Systems International, New Haven, CT
> { uunet | ihnp4 } ! hsi ! stevens

Alan Crosswell
Columbia University

PS: We (have) run Wiscnet, PCIP, TCP/IP for VM and the PC (using both
the DACU and the new LAN Channel Station) but have no experience with
the 9370. Don't let them sell you a 9370 just to be a network
front-end for a larger VM machine -- get a LAN Channel Station
instead. It's just a tweaked AT with a channel cable!



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