Ever since the start of this project, the SIBO Serial Protocol (SIBO-SP) has loomed large as Something We Need To Know About. It’s a protocol using 12-bit packets, a LSB-first data payload, and a series of reset and select control commands, all done on one data wire and one clock wire. As you’ll see in previous logs, we’ve managed to decode a large amount of it and I’ve published my Sigrok decoder on my GitHub page.

I now have everything I need to get started on revealing the secrets of the Psion SSD Port. So, here’s what I’ve been up to this morning.

Rather than pull apart my “production” 3c, I’ve decided to get to work on a slightly broken 3a. I don’t like the idea of doing something dumb thanks to my inexperience and blowing up my 3c. The 3a’s battery compartment is in a pretty bad way, but it powers on quite happily with a Series 3 external PSU. So, I pulled it apart and got to work.