HP 3000 Manuals HP 3000 Manuals
HP ALLBASE/4GL Terminals
HP ALLBASE/4GL runs on most HP terminals supported by the MPE/iX
operating system. It supports all the standard features of these
terminals such as function keys and special editing keys. Depending on
your terminal type, HP ALLBASE/4GL also makes use of the terminal's line
drawing, color and touchscreen capabilities.
HP ALLBASE/4GL Terminal Initialization
At the start of each session, HP ALLBASE/4GL uses the current value of
the MPE/iX variable HP4TERM to establish the terminal type and
capabilities. HP ALLBASE/4GL uses a support file for your terminal to
determine how to drive it. If the value of the HP4TERM variable is
invalid, HP ALLBASE/4GL displays an error message and terminates.
The value of the HP4TERM variable should be set to the type of terminal
that you are using. For example, if you are using an HP 2392a terminal,
you should set the HP4TERM variable to the value "HP2392A" using the
command:
SETVAR HP4TERM "HP2392A"
Refer to appendix D for a summary of the acceptable values for the
HP4TERM variable.
If the HP4TERM variable is not set, the HP ALLBASE/4GL start-up command
file assumes a default value of "HP" for the HP4TERM variable.
System Character Sets
HP ALLBASE/4GL supports the full HP Roman8 extended character set. To
use eight-bit characters, your terminal must support the HP roman8
character set and be in eight-bit mode.
If your terminal doesn't have line drawing capabilities, HP ALLBASE/4GL
will replace any line drawing characters with equivalent ASCII
characters.
Using a Touchscreen Terminal
If you want to use touchscreen operation, make sure that the terminal is
in touch mode before you start HP ALLBASE/4GL. You can turn touch off at
any time while HP ALLBASE/4GL is running, but you cannot turn touch on
again. If you do, touch operation may not work reliably.