Hewlett-Packard block mode terminals, which have the capability
of handling all or part of ROMAN8, can be divided into two groups.
The group differentiation is based on how they handle alternate
character sets when configured for 8-bit operation.
Group 2 - HP 2622A, 2623A, 2626A, and 2382A |
 |
(Do not use an HP 2624A or HP 2624B, as they are
unable to handle 8-bit characters properly.)
Group 2 terminals
use the eighth bit to switch back and forth between a
7-bit base character set and a 7-bit alternate character set.
It is not possible to
get true 8-bit operation (ROMAN8) and use an alternate
character set (for example, Line Draw) at the same time
because the base character set is not really 8-bit, but 7-bit with
the additional characters defined in the alternate character set.
Using both 8-bit ROMAN8 characters and Line Draw in the same file is
not recommended since the user
must continually redefine the alternate character set, switching
back and forth between Roman Extension and the line
drawing character set. Shift-out and shift-in
are ignored by the terminal and return to the alternate character
set when the high-order bit is on.
Files using alternate character sets on one group
of terminals do not display correctly on the terminals of the other
group, even when terminals from both groups are configured for 8-bit
operation.
The use of characters from an alternate set affects
the conversion procedure. If the forms file does contain
characters from an alternate character set, choose one of the
following alternatives:
Eliminate the use of alternate character sets (either with
FORMSPEC or while running V7FF8CNV).
Define alternate character sets to appear correctly on
Group 1 terminals. This happens automatically when
V7FF8CNV is run from a Group 1 terminal. Characters
from these alternate sets appear as USASCII characters
on a Group 2 terminal.
