Tally Genicom Matrix Printer - 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
L
, n
H
Horizontal dot count (columns of dot graphics)
Calculating algorithm:
n
H
= INT
(horizontal dot count)
256
n
L
= MOD
(horizontal dot count)
256
x Total number of data bytes
x = m x INT
(n
H
x 256 ) + n
L
+ 7
8
d During normal mode (c=0)
Graphics data
d
1
... d
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
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