Genicom GEK 00031B Programmer's Manual page 234

HPB
Chapter 8. PPL3 Plus Emulation
Horizontal Position Backward: Moves the active position to the left
a specified number of units.
Source: Application
Format
CSI Pn
Description
Select Pn as follows:
Pn Meaning
0 Interpreted as 1.
n Number of units, depending on Positioning
Unit Mode (PUM) and Select Size Unit (SSU).
The HPB command can place the active horizontal position to the left
of the Line Home Position or to the right of the Line End Position.
When lining attributes are invoked by Select Graphic Rendition
(SGR), HPB underlines, double underlines, overlines, or strikes
through from the current position to the target position.
The First Character Flag has no effect on HPB.
Error Handling
If the resulting active position would be to the left of the Left Margin
Position, the printer sets the horizontal position to the Left Margin
Position.
When the Right Margin Flag is set, the command is ignored.
Destination: Level 3
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GEK-00029B