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IBM Proprinter Emulation
Page 4-14
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