Hi there, new to the forum and vintage computers after having just unearthed a Sorcerer 2 with the FDS configuration in question so I thought I'd share. I have the main unit with PSU/controller and the second without the PSU. The main unit is labelled DP6400 and the second is a DP6401-2. Both contain identical Micropolis 1015-2 drives and are connected with the 34 pin and 4 pin cables. One thing I notice is that the Exidy branding on the drives don't match, maybe a clue that it was a later addition?