[lenovo3000]

Is it possible to change in the program MSID_dumper to read and wrote only the first sector 0x200? If you need to replace only the first sector is easier than all the 3 sectors.I made corrections in the schema.I added the keys mosfet 4066 ,because the AVR pins can be set either as inputs or as outputs. And there is a need for bidirectional communication.
The point is that the key 4066 is always in active state (bidirectional communication betwen MemoryStick <-> PSP) with the exception of the sequence of substitution of the first sector 0x200.
In total, how read and write the card in the PSP is the same as the computer's card reader.
If you do not find on the internet information of the sequence of read and write Memory Stick, then I will have to construct a sniffer which will be followed at one time a few channels (which is connected to the respective pins are the card). It's as if the plug in multichannel oscilloscope recorder with (something like Terminal for COM). I admit that an ambitious plan