This command reads a byte of data from a RAM scratch pad. The scratch pad is globally accessible by all reflexes and VM processes. A scratch pad index that is out of range will generate an error message.
The reply packet is cmdPAD_IO, followed by the scratch pad index and retrieved data byte.
The second form of this command writes data to the scratch pad. A scratch pad index that is out of range will generate an error message. There is no reply packet.
See the discussion of Scratch Pad usage for more details.