The PG Designs SAFE was available for models 100, 102, and 200.
The SAFE was also sold by Travelling Software as the ROMPAK, with TS-DOS and SARDINE roms pre-installed.
The SAFE has 8 ROM sockets, 4 that mimick the Molex socket and non-standard pinout of the option rom socket in the Model 100, and 4 that are standard DIP-28 sockets with standard 27C256 pinout. All 4 of the standard sockets are filled by the SARDINE roms in the TSI ROMPAK
Info from the M100SIG archive