Kbase 12628: Why HP Terminals Do Not Display Graphics with PROGRESS
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
5/10/1998 |
|
Why HP Terminals Do Not Display Graphics with PROGRESS
An Hewlett Packard (HP) terminal doesn't display graphics because
it is neither a space-taking nor a non-space-taking terminal.
Its attributes are non-space-taking but its mechanism for displaying
and clearing data is the same as that of a space-taking terminal.
The HP terminal sends information to display on the screen in the
following order.
1. The turn-off attribute (A)
2. The turn-on attribute (B)
3. All of the information in-between the two attributes.
(B) xxxx-data-xxxx-data-xxxx-data-xxxx-data (A)
The HP terminal clears information from the screen in the following
order.
1. The turn-on attribute (B)
2. The turn-off attribute (A)
3. All of the information in-between the two attributes.
In the PROGRESS PROTERMCAP file, the number of screen spaces used for
the underline attribute (ug) and the highlight attribute (sg) are set
to 1, indicating a space-taking terminal. PROGRESS turns on a
mechanism that clears the screen properly. PROGRESS does not display
graphics because they would take up additional space on the screen.
PROGRESS Version 7 supports this issue better than previous versions
of PROGRESS because it uses the Vermont View libraries for tty
support.
Progress Software Technical Support Note # 12628