IBM Mainframe terminal stuff

Mike Ross tmfdmike at
Sat Dec 19 14:57:59 CST 2015

Oh that IS interesting. I have a 3172; never done anything useful with it.
Maybe time to have a play. I do remember there was a version of the 3172
that had a P/390 card in it, to allow it to run some kinds of comms stuff
that normally ran on a mainframe CPU.

Cisco sounds useful too; I'll investigate that. So with the right cabling
you could potentially hook a 3277 directly to a correctly configured Cisco
router, then (say) telnet to a Linux box... Just as you can with a 3278
connected to a correctly configured 3174? 'Correctly configured' in both
cases involving the incantation of complex and obscure runes...

On Dec 20, 2015 8:04 AM, "Ken Seefried" <seefriek at> wrote:

> From: Mike Ross <tmfdmike at>
> > I have a 3172 controller; physically rough and needs restoration but
> *should* work if
> > I can fake the remote connection and modem - bisync etc. B
> From: Paul Berger <phb.hfx at>
> > you need a modem eliminator mostly to provide the clocks for the sync
> data line,
> > other than that is is similar to a null modem.
> Not sure if this would work here, but the Cisco IOS "IBM Feature Set"
> has support for all sorts of weird bisync use cases.  I've used it to
> fake termination of an ALC (Airline Line Control) bisync connection
> where a modem connection was expected.  You can then convert, tunnel
> or bridge to any number of other strange things.
> There even exists an IBM channel attach card for the Cisco 7k routers
> that turns it into the equivalent of a 3172 and/or 3745.
> KJ

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