🚀 go-pugleaf

>This isn't what the previous poster was talking about. This case is fairly
>easy to do. I'd be *REAL* interested to see a 3270 looking like a glass
>tty. It's easy enough to do for line-at-a-time operation, but when you're
>looking for each character individually (like in vi) the poll delay,
>host interrupt rate, and bandwidth restrictions will kill you quick.
>Not to mention being forced to hit one of the "transmit" keys in
>addition to the keystroke you wanted (like "enter" or "PA1" or ...).

>If you folks find something that comes close, *PLEASE* let me know.
>We've struggled long and hard to make our Unix (tm AT&T) accessible
>to users with 3270 terminals. We've succeeded in most areas, but
>editors (for example) we've had to provide parallel solutions for.

There are at least two extremely good (if maybe not very cheap) solutions.
The key is that any such support (in the IBM world, it is often
called "reverse protocol emulation") must be able to see individual
3270 keystrokes.  One solution is to put a black box (I cannot remember
the name of a vendor right now, but there are two or three out there)
on your co-ax between your IBM 3270 and your IBM controller.  The black
box will have a side ASCII port, which will then connect into your
UNIX world, emulating a VT100 or whatever.  The black box will also
support connection down the co-ax into the IBM world.  The other solution
is to replace your older IBM 3274 controllers with newer IBM 3174 controllers,
and to include ASCII ports into the UNIX world emulating VT100's.
Other vendors (AT&T comes to mind) also support the same sort of thing
in their 3270 lookalikes.  This latter solution may not be all that
expensive if you are just now putting in IBM terminals and controllers,
but it may be expensive if you already have the 3274's.  3174's are quite
inexpensive these days (much less expensive than DEC terminal servers, for
example), but it is a "waste" is some sense to replace otherwise perfectly
good 3274's with 3174's.  Any terminal emulation which is on the inside
of the IBM controller (in the host, for example) will have some or all
of the problems you describe, and there is nothing that can be done about
it.  The problem is that only the controller sees individual keystrokes, and
the terminal is presented to the host in block mode.  Thus any really
good emulation has to be in the controller or between the controller
and terminal.