Dynabyte --  16K Dynamic RAM Board
This was perhaps Dynabytes most successful S-100 board. The board was utilized by many people in non-Dynabyte systems. It contained refresh logic completely transparent to 8080 systems and never generated a WAIT state. It was capable of 1Mhz DMA.

The board used National Semi MM5721D RAMs.  The lack of heat sinks on this board is somewhat surprising!  Other than that I have no information about the board.  
If anybody could share the manual please let me know.