TallyGenicom Matrix Printer Programmer's Manual page 160

Description of parameters:
c = 0 Normal mode (not compressed)
c = 1 Data Length Encoding (DLE, compressed)
v Vertical resolution in dpi: 360, 180 dpi
h Horizontal resolution in dpi: 360, 180 dpi
m Vertical dot count (rows of dot graphics)
n , n Horizontal dot count (columns of dot graphics)
L H
Calculating algorithm:
(horizontal dot count)
n = INT
H
(horizontal dot count)
n = MOD
L
x Total number of data bytes
(n x 256) + n
H
x = m x INT
d During normal mode (c=0)
Graphics data
d ... d
1 x
d During DLE (c=1)
The first data byte is treated as a counter. Graphics data bytes then alternate
with a data counter byte:
0 ≤ (counter byte) ≤ 127
256
256
+ 7
L
8
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