8 Rocket Model 204 Terminal User’s Guide
Controlling output
do not produce hard copy. The backpaging feature is available only if the
system manager sets the NBKPG (number of backpages) parameter to a
positive number during system initialization. Refer to the Model 204 Parameter
and Command Reference Manual for a description of NBKPG and the other
parameters that affect terminal operations.
Note: The backpaging feature is not available on all types of terminals and is
not available during editing sessions.
Issuing a backpage request
When the terminal is ready to accept input, the user can request (except during
editing) to have a backpage displayed by entering the backpage character, a
single space, and a negative number. An appropriate backpage character can
be selected by the system manager and specified as the value of the PAGE
parameter. PAGE has a default value of P and can be reset by the user. Refer
to the Model 204 Parameter and Command Reference Manual for a complete
discussion of the PAGE parameter.
For example, a user who is on page 17 and who wants to see page 16 enters:
P -1
Because Model 204 prepares for a new page before pausing at the bottom of
a full page, at the following backpage request, entered at the end-of-page
pause displays the page just ended:
P -1
A backpage request entered after an editing session refers only to output prior
to the editing. That is, the user cannot page back into output generated as part
of an editing session. Model 204 treats the backpage request as if that session
did not occur.
If the user tries to page back beyond the number of backpages saved, the
oldest available backpage is displayed. If the user tries to page forward beyond
the most recent page (by using P followed by a positive number), that page is
displayed. If the syntax of the PAGE parameter is invalid or the backpaging
facility is not available to the terminal user, Model 204 responds:
*INVALID PAGE REQUEST*
This system response is followed by another prompt.
If the MODEL parameter is reset during a terminal session, the page size is
redefined, and any existing backpages can no longer be displayed.
Whether or not the backpage request is valid, the terminal returns to input
mode. The user can backpage again or enter a new line of input, which then is
displayed in its proper place on the next most recent page.
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