The terminals turn on line drawing using the Shift-Out Character (^N, $0e) and cancel it with Shift-In (^O, $0f). For detailed reference manuals on HP and DEC terminals, visit the WRQ Support web page.
To use ^N on a VT terminal, select
"Special Graphics Character Set"
as set G1 with Esc
The ANSI/VT codes are also the default line-drawing codes for
versions of UNIX which support them.
On the original IBM PC, the ECS Extended Character Set defined line drawing graphics for some of the upper 128 character codes. Therefore you didn't need to use Shift-In and Shift-Out.
However, Windows uses the ANSI extended character set, which is based on ISO Latin-1. This means Windows handles more European languages, but has no line-drawing symbols.
On an HP Laserjet, you can use the PC-8 symbol set if you want ECS.
Select PC-8 for the primary LaserJet font
5(s0P, then enter character values
between 179 and 254 ($b3 - $fe).
Here are the only line drawing symbols which are common to all three character sets:
|Upper left corner||r||l||da|
|Upper right corner||t||k||bf|
|Lower left corner||f||m||c0|
|Lower right corner||g||j||d9|
|Cross center lines||/||n||c5|
To enter characters which don't appear on the keyboard, see Extended Characters.
You can also draw forms on HP terminals using Display Enhancements.