AA-SRAM is an expansion board with 16 Mbit (2M x 8) 10ns static RAM suitable for Alchitry Au or Au+ FPGA Development Board produced by Sparkfun.

https://www.sparkfun.com/products/16527

The AA-SRAM is equipped with four connectors on top and four on the bottom for maximum stackability that snap to an Au or Au+ board.

The board is a memory expansion pack of the eLeMeNt ZX project as well.