Printronix ProLine 5 Series Manual page 218

Simple Tear
The Simple Tear Mode requires special form layout and application design.
However, it allows demand printing without losing any forms. The parameters for
using this function are:
When the VIEW/EJECT key is pressed once, the printer slews the bottom of the
last printed form to the tear position.
When the VIEW/EJECT key is pressed a second time, the paper reverses the
exact distance it slewed. For it to work properly:
The form length must be set correctly.
The Top–of–Form must be set to the actual top of form.
There must be a space of at least 2.66 inches from the top of form
(which can be used for pre–printed headers) to prevent the paper from
falling out of the tractors when reversing. The paper motions are as
shown in the following diagram:
Demand Printing B–3