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AS400ASC.THD
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1991-12-27
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as4asc.thd
AS/400 with ASCII terminals.
Short discussion sparked by a question about using an ASCII controller
with an AS/400 to take advantage of existing terminals.
This is an ASCII file. READ or download with any supported protocol.
Uploaded by Anne E. Pruitt 72335,777. From the Computer Consultant's Forum.
IBM ASCII AS400 TWINAX PC SUPPORT
#: 60945 S5/Technical-Big Sys
10-Nov-90 02:01:41
Sb: AS/400 ASCII Controller
Fm: Eric Fisher 75056,1713
To: All
We are considering a AS/400 equipped with an ascii controller to take
advantage of our existing terminals and printers. I was wondering if anybody
has had any experience with this configuration. Specifically are there any
limitations associated with using ascii devices. Other then speed, can
inexpensive "dumb" terminals do everything that the twinax terminals can do?
Any insight would be appreciated
Thank You
Eric
#: 61021 S5/Technical-Big Sys
10-Nov-90 22:08:15
Sb: #60945-AS/400 ASCII Controller
Fm: Norman Rheaume 71630,3476
To: Eric Fisher 75056,1713 (X)
Eric,
We're installing an AS/400 with the ASCII controller but our planned use
will be dial-in support for PCs. We don't have it up and running yet but
reviewing the tech specs we don't anticipate any problems. It support
several ascii emulation types. You may need multiple keyboard strokes for
command keys and roll-up/down etc.
If you use PCs, the AS/400 PC Support will work with the ASCII Controller
and give you virtual disks as well as host sign on session capability.
Your expense will be will wiring. BLACK BOX is one of many (can't name
another) companies that will have solutions to reduce the cost. Watch
your cabling (EIA being what it is... pins 2,3,6,8,21,....
Also you're limited to one terminal to a port (with possibility of an
attached printer). My recollection is that printer support is basic.
We currently use external 5208 Protocol Converters which are less
functional than the ASCII Controller. They're attached to a System/36
in the computer room and remote controller at a remote site.
We use IBM 3161s and PCs with good results. Things like compressed print
on the attached printer was a problem on the 3161.
The PCs use a PRPQ called DIAL/3X from IBM. The software installs
emulating an IBM 3161 ASCII terminal with docs for changing to VT100 etal.
We use it primarily for off hour technical support, although I have dialed
in at night from my house for application development.
Norm
#: 61166 S5/Technical-Big Sys
12-Nov-90 00:44:46
Sb: #60945-AS/400 ASCII Controller
Fm: Tony Toews 71760,3552
To: Eric Fisher 75056,1713
Eric
Norman's comments about the ASCII WS are all very valid.
The terminal emulation, such as VT240 seemed reasonably good according to a
technically competent DEC person. (Which I am not)
As far as speed goes, the maximum speed of the ASCII WS controller is 38.4Kb.
I'm not sure that the response time of a twinax attached terminal is that much
faster. Maybe only double or so. Even though twinax is rated at 1Mbps the
interactive response time doesn't look that much faster. Note that this, of
course, doesn't hold for file transfers and the like.
Note that the new release, 3.0, of OS/400, which you will be getting with any
new AS/400 shipped for the last month or so supports multiple devices
configured for the same ASCII WS port. That is a VT100, VT240, Wyse xxx, IBM
3101, and PC Support based PC can each access the same port. Obviously not
simultaneously but you no longer have to state that VT240's are restricted to
port 4 and 5 while IBM 3101's are restricted to ports 6,7 and 8 and so on.
Tony