(From The big book of Amiga hardware - http://www.amiga-hardware.com/)

This is a fast SCSI II expansion module for use with the Blizzard 1230-IV and Blizzard 1260 A1200 Accelerators. It can transfer at speeds up to 10MB/s, supports 32bit DMA and also contains a SIMM socket for up to an additional 128MB of RAM.

Tested and working although I'm not sure how much memory is on the included SIMM.