Datamax-O'Neil VMP SERIES AN-16 (Single Byte Character Set Font File Format) - Manual (Page 4)

If the font is a proportionally spaced font, then two bytes are added to the beginning of EACH bitmap that represents a
character. The two bytes are the width of that particular character, LSB first.
The letter "A" then might be built as follows (note that even though the character is only 12 dots wide, we must represent it
with two full bytes, or 16 dots):
CELL EXAMPLE #1:
0000011000000000 -> 006h & 000h
0000011000000000 -> 006h & 000h
0000111100000000 -> 00fh & 000h
0000111100000000 -> 00fh & 000h
0001111110000000 -> 01fh & 080h
0001100110000000 -> 019h & 080h
0011100111000000 -> 039h & 0c0h
0011111111000000 -> 03fh & 0c0h
0111111111100000 -> 07fh & 0e0h
0110000001100000 -> 060h & 060h
1110000001110000 -> 0e0h & 070h
1100000000110000 -> 0c0h & 030h
1100000000110000 -> 0c0h & 030h
1100000000110000 -> 0c0h & 030h
The "cell" for this character is 14 dots high and 12 dots wide. If, in the same font, we wanted to also represent the lower case
"j", with descenders (that part of the character below an imaginary line along the bottom of all upper case letters) we would
need to increase the cell size to 20 high from 14 high:
CELL EXAMPLE #2:
00000001 10000000 -> 001h & 080h
00000001 10000000 -> 001h & 080h
00000000 00000000 -> 000h & 000h
00000000 00000000 -> 000h & 000h
00000001 10000000 -> 001h & 080h
00000001 10000000 -> 001h & 080h
00000001 10000000 -> 001h & 080h
00000001 10000000 -> 001h & 080h
00000001 10000000 -> 001h & 080h
00000001 10000000 -> 001h & 080h
00000001 10000000 -> 001h & 080h
00000001 10000000 -> 001h & 080h
00000001 10000000 -> 001h & 080h
00000001 10000000 -> 001h & 080h
00000001 10000000 -> 001h & 080h
00000001 10000000 -> 001h & 080h
01100001 10000000 -> 061h & 080h
01110011 10000000 -> 073h & 080h
00111111 00000000 -> 03fh & 000h
00011110 00000000 -> 01eh & 000h