6530 Programmer's Guide

Block Mode Operation
6530 Programmer’s Guide 3-73
For example, the sequence
DC4 H33
repeats the character 0 (zero) 19 times, beginning at the current buffer
address on the selected page.
Start Extended Data Compression (DC2)
The control character DC2 (12H) specifies the start of a 3-byte character
sequence that defines Extended Data Compression (EDC) characteristics.
The sequence consists of the DC2 control character followed by two
parameters that specify an ASCII character to repeat and the number of
times the character is repeated. The format for the sequence is as follows:
DC2 p1 p2
where:
DC2 indicates the start of the EDC sequence.
Bit 76543210
absolute count (0 - 31)
1 (mandatory)
specifies that the character to
repeat is ASCII zero (30h)
parity
0
1
Bit 76543210
absolute count (0 - 63)
specifies that the character to
repeat is ASCII blank (20h)
parity
1