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FF is the format byte and must equal X'13'.
LF is a one-byte font identifier that specifies the previously initialized or selected
font to be modified. See “Change Font (ESC I)” on page 201.
W is a one-byte value that specifies the width of the character cells in options. For
DP fonts, the value is X'0A'. For fixed pitch DP Text and NLQ fonts, the value is
X'14'. For DP Text and NLQ, proportional fonts values may vary. However, for all
code points downloaded with this control, all character cells defined will be
Width
options wide.
H is a one-byte value that specifies the height of the character cells in dots. Valid
values are X'09' for DP and DP Text and X'12' for NLQ.
CP is a one-byte value. This parameter specifies the first code point to download. A
single code point or multiple code points can be downloaded. If the font being
downloaded was previously initialized, the downloaded characters overlay the
resident characters in the font.
N is a one-byte value that specifies the number of code points defined by this
control. If the starting code point plus the number of code points is greater than
256, the control is ignored.
XX .. XX is the font image download data. These data bytes define the character
cells. Multiple bytes define each vertical slice of the character cell. The slice data
for each code point is in a contiguous format (run-together) as follows:
v If the slice data is nine-bits high, byte 1 is put into the high-order bits in slice 1
and the high-order bit of byte 2 is the low order bit of slice 1. The remaining
seven bits of byte 2 are put into the high-order seven bits of slice 2, and so on.
v If the slice data is 18-bits high, bytes 1 and 2 are put into the high-order bits of
the first slice and the two high-order bits of byte 3 complete the first slice. Slice 2
is composed similarly, starting with the remaining six bits in byte 3.
Note: The contiguous format (run-together) does not occur from one code point to
the next. The top dot of the leftmost slice of each code point is always in the
high-order bit of the first byte of image data for that code point.
The number of data bytes required to define the image for each code point can be
calculated as follows:
Image Length = (Width × Height) ÷ 8
Note: If there is a remainder from the division by 8, add 1 to the quotient.
Example:
To define an image for a standard DP font where Width = 10 and Height
=9:
Image Length = (10 × 9)÷8
Image Length = 11 with a remainder of 2
Image Length = 12 bytes per character
If both printer provided images and downloaded images are to be printed from the
same local font ID, IBM recommends that the downloaded images be sent, using
this control, at the start of a print job when the print environment for the job is
established. This ensures that the actual printed output appears as intended.
Appendix D. Personal Printer Data Stream (PPDS) 199