Microcom 438 User Manual

Page 115

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Downloadable Fonts

Chapter 7

7-6

438 Operator’s Manual - 880052-0100

significant byte” first. The printer can store a font of approximately 64KB or less in any one
memory slot location.

(Word is a 16-bit value, Byte is an 8-bit value, and Label is a location within the file)
Label start:

the beginning of the file


Word, Word, lookup_table_offset

distance in bytes from start to beginning of
lookup_table (4 bytes)


Word tallest_char

height of graphic image in dots

Word widest_char

Width of graphic image in dots


Byte default_spacing

Default spacing, usually 0


Byte byte_width

Width of graphic image in bytes


Byte first_char

20 HEX


Byte last_char

20 HEX

Byte default_char

20 HEX


Label lookup_table

beginning of lookup table


Word char_offset [last_char-first_char]

an array of offsets, one for each character in
font. Each offset is the distance, in bytes,
from the start to the beginning of the
corresponding character’s data structure.
The first word in this array is the offset to the
first character’s data; the last word is the
offset to the last character’s data.


Label first_char_data

the beginning of the graphic image data


Word char_height

height of this character’s bitmap in dots


Word char_width

width of the graphic image in dots


Byte bitmap_data[char_height][byte_width]

bitmap of character, 2d array. The most
significant bit of the first byte in each row,
prints as the right most dot of the character,
and the first row is the bottom row when
printed.

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