reset				 =>  6 0      0     0
nop				 =>  7 0      0     127
read <id>, <addr>		 =>  9 <addr> 0     <id>
write [<id>,] <addr>, <val>	 => 10 <addr> <val> <id>
read_block <id>, <addr>, <count> =>  9 <addr> 0     <id>, 9 <addr>+1 0<id> ...