Legacy Ultra60 with Solaris 5.7 SCSI device reverse engineering

I'm looking for help with a legacy system.

I have some obsolete equipment connected to an Ultra 60 running Solaris 5.7 with the binary for a 32 bit driver. The driver is rejected by newer versions of solaris, which run 64 bit kernels.

I hope to reverse engineer the driver so that I can move to a more modern OS and HW solution. The manufacturer of the device and its protocol, in fact the entire industry, became defunct in 1998, and, I do not have the source code for the driver. The device is actually connected via a blackbox scsi-to-fiber device. So I need to be able to tap into the data stream so I can analyze what needs to be done to create a new driver.

Thanks for any info you can provide.