Interdata_v6/usr/source/troff/tests/fnt.x

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Head title 1


Today's   increasing
abundance   of  dif-
ferent types of com-
puter   terminals(1)
bodes  well  for the
satisfaction of  the
diverse   needs  and
desires of  computer
terminal   users.(2)
__________

(1)See attached
list.

(2)Footnote...

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Head title 2


Before any new  ter-
minal can be connec-
ted  to  a  computer
system,  however, an
appropriate   inter-
face   must   exist.
This      interface,
inevitably involving
both system hardware
and  software,  must
cope    with     the
terminal's    speed,
character set,  line
discipline,  special
features,  lack   of

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Head title 3


features,  and other
idiosyncrasies.(3)
In  many  cases, the
physical association
of such an interface
__________

(3)See
reference   (3)
for   a    more
complete
description  of
terminal
differences.


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Head title 4


with a  terminal  is
dynamic;        most
general-purpose
time-sharing systems
are   accessed   via
switched   telephone
lines.      Although
dedicating   certain
access lines to each
terminal type is the
simplest   approach,
economy     dictates
that  as  many  ter-
minal  types as pos-
sible be  served  by

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Head title 5


each  group of dedi-
cated  lines.    The
greatest economy oc-
curs when  all  ter-
minals  can  use the
same group of lines.
If   different  ter-
minal types  are  to
use  the same access
lines, it is  neces-
sary  for the system
to be able to  iden-
tify   the  terminal
type.   This   paper
addresses        the

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Head title 6


terminal-type  iden-
tification problem.
TERMINAL  PROPERTIES
While it is the dif-
ferences     between
types   that  brings
about the  need  for
identification,   it
is often these  dif-
ferences that permit
identification.  The
properties and abil-
ities  of  terminals
may   be  classified
and   examined   for

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Head title 7


their  effect on the
necessity  for   and
the  possibility  of
type    indentifica-
tion.   The  concern
here     is     with
typewriter-like ter-
minals     employing
asynchronous charac-
ter  communications.
The first properties
to be enumerated are
fundamental ones; i.
e,  properties  that
cannot   be  ignored

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Head title 8


when   communicating
with  the  terminal.
Character  code  and
format.  In addition
to the  character  -
bit-pattern    rela-
tionship,       this
includes(end)

extra line






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Head title 9


another extra line.















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