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IBM Proprinter Emulation
55
Horizontal Tabs
Default horizontal tab stops are set at every eighth column, i.e. column 9, 17, 25, 33, 41, etc. The default tab
stops are associated with columns, not absolute physical positions. Changing character spacing will change
the physical position of the default tab stops.
User defined horizontal tab stops are associated with absolute physical positions, not with columns. The tab
stops are set relative to the current character spacing, but subsequent changes in character spacing will not
affect the physical position of the tab stops (except that the position will be rounded up to the closest
character boundary).
Horizontal Tab HT
Advances to the next horizontal tab stop. If no tab stop exists between the active column and the right
margin, the HT will be ignored. Default tab stops are set at every eighth column, i.e. column 9, 17, 25, 33,
41, etc. Different tab stops may be set with ESC D.
Control code: HT
Hexadecimal: 09
Set Horizontal Tab Stops ESC D n1 n2 ... nx NUL
Clears all currently set horizontal tab stops, and sets new tab stops at column n1, n2, n3, etc. 1≥n≥255.
The tab stops must be presented in ascending order. The NUL character, or any tab stop value less than the
preceding one, terminates the sequence. The tab stops are set relative to the current character spacing, but
subsequent changes in character spacing will not affect the physical position of the tab stops (except that the
position will be rounded up to the closest character boundary). The leftmost column is column one.
Default tab stops are set at every eighth column, i.e. column 9, 17, 25, 33, 41, etc. The tab stops set by
ESC D will replace the default tab stops. ESC D NUL will clear all tab stops, leaving no tab stops set. The
default tab stops are restored by ESC R.
Example: The following escape sequence will set horizontal tab stops at half inch intervals, if character
spacing is currently 10 cpi.
Escape Sequence: ESC D 6 11 16 21 26 31 NUL
Hexadecimal: 1B 44 06 0B 10 15 1A 1F 00
Vertical Tabs
Vertical tab stops are associated with absolute physical positions, not with lines. The tab stops are set
relative to the current line spacing, but subsequent changes in line spacing will not affect the physical position
of the tab stops.