HP 3000 Manuals HP 3000 Manuals
HP ALLBASE/4GL Terminals
HP ALLBASE/4GL runs on most HP TERM0 terminals supported under 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 can also use the terminal's line
drawing, color, and touchscreen capabilities.
HP ALLBASE/4GL Terminal Initialization
At the start of a session, HP ALLBASE/4GL uses the system 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
HP ALLBASE/4GL cannot find the terminal support file, or the HP4TERM
variable is undefined or invalid, an error message is displayed and HP
ALLBASE/4GL terminates.
In general, the value of the HP4TERM variable should be the name of your
terminal type. For example, if you are using an HP 2392A terminal you
should set the HP4TERM variable with the following command:
SETVAR HP4TERM "HP2392A"
If required, you can use a logon UDC (user defined command) to set the
HP4TERM variable.
Refer to Appendix C for details 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".
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 must be in eight-bit mode.
If your terminal doesn't have line drawing capabilities, HP ALLBASE/4GL
replaces 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.