3.3 Graphic Data Format- Page 534

APPENDIX C HBP MODE COMMANDS - 12

The 5th byte data onward is replaced by the twelve data bytes  AAh. 

11101010b,02h,Aah 

When the replacement position and the amount of replacement data are overflow, the next data byte 
becomes an Expansion Offset Byte.  However, if the number is FFh, 00h is added. 

The number of command bytes = 300,  FFh+2Dh 

The number of command bytes = 510,  FFh+FFh+00h 

If there are more than two command bytes for 1 raster, the replacement position for the second command 
byte onwards is indicated by the offset byte, starting from the data position replaced by the first command 
byte.