Genicom GEK 00031B User Manual

Page 224

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Chapter 8. PPL3 Plus Emulation

GEK-00029B

224

DECSTBM

(continued)

The printer places data only within the top and bottom margins, with

the following exceptions:

• Draw Vector (DECVEC) and Draw Relative Vector (DECRVEC) draw
lines outside the margins.

• Partial Line Down (PLD) may print part of a character below the
bottom margin.

• Partial Line Up (PLU) may print part of a character above the top

margin

The Superscript and Subscript attributes set by Select Graphic
Rendition (SGR) can print characters above the top margin.

If the margins are less than one character height apart, text may
exceed the bottom margin.

If the active position is less than one character height from die
top margin and the First Character Flag is not set, text may
exceed the top margin.

The printer sets the margins relative to the page origin, as set by
Origin Placement Mode (DECOPM). Changing the page origin causes
the margins to move.

Changing the top and bottom margins does not affect vertical tab
stops. The active position is affected only if it is outside the new
margins.

Set Lines per Physical Page (DECSLPP), Page Format Select (PFS),
Variable Page Format Select (DECVPFS), and the reset commands

affect margin settings.
Side Effects

DECSTBM sets the Page Home Line equal to the top margin and Page
End Line equal to the bottom margin.

DECSTBM affects justification. See Justify (JFY).
Error Handling

If the active position is above the new top margin, then the printer
sets the active position to the new top margin, and sets the First
Character Flag.

If the active position is below the new bottom margin, the printer sets
the active position to the new bottom margin.

If Pn2 is greater than the form length, the printer sets the bottom
margin to the form length.

If Pn1 is greater than or equal to Panama, the printer ignores the
command, except for the side effects listed above.

If DECOPM is set, characters above the top printable limit are not
printed.

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