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Chapter 8. PPL3 Plus Emulation GEK-00029B
254
Horizontal Advance Increments
Fixed HAI
Fixed horizontal motion does not vary from character to character or
font to font. The HAI is explicitly defined by control functions.
A fixed HAI is selected by any of the following:
▪
Pitch Select Mode (DECPSM) reset, and Set Horizontal Pitch
(DECSHORP) with last valid Ps
≠
0
▪
Spacing Increment (SPI) with last valid Pn2
≠
0
▪
Set Horizontal Spacing (SHS) using any valid Ps
Control
Function Type Margin effect Parameter Used Flags
Autowrap Relative - All Clears PLU/PLD count and
Superscript/Subscript count.
Backspace Relative Not possible beyond left
margin
All Active only if right margin flag
is cleared
Carriage
Return
Absolute - All Clears RMF
Cursor Up Relative Not possible to move above
top margin
Parameter value
more than 5
decipoints
FCF Sets if cursor forced above
top margin
Graphics
Carriage
Return
Absolute Cursor moves back to
Graphics left margin (left
margin where graphics
starts).
All -
Graphics
Next line
Relative Forces Graphics carriage
return, New line beyond
bottom margin leads to Form
Feed
All -
Form Feed Absolute - All Sets FCF
Clears RMF
Clears PLU/PLD and
Superscript/Subscript
Horizontal
Position
Absolute
Absolute Movement is possible with in
left and right margin.
All Pn less than right margin
Resets RMF
Other Pn values Sets the RMF
Horizontal
Position
Backward
Relative Maximum backward
movement possible is up to
left margin.
All Command ignored if RMF is
Set
Horizontal
Position
Relative
Relative New position beyond right
margin leads to autowrap if
autowrap is ON.
All If autowrap OFF then new
position beyond right margin
Sets RMF
Horizontal
Tab
Absolute If there is no tabs in the tab
table or no valid tab between
the current position and RM
then HT brings the cursor to
right margin (RM).
All HT beyond right margin Sets
RMF
Index Relative IND in bottom margin leads
to FF
All Clears superscript/subscript
and PLU/PLD count
Line Feed Relative LF in bottom margin leads to
FF
All Clears superscript/subscript
and PLU/PLD
Next Line Relative NEL in bottom margin leads
to FF
All Clears RMF
Clears superscript/subscript
and PLU/PLD
Partial Line
Down
Special Can go down to one PLD
position below bottom
margin
All
(Minimum
PLU/PLD count
value is -255)
Decrements the PLU/PLD
count