Dallas DS1217M4-25 Non-Volatile SRAM

Rugged Non-volatile SRAM Memory Cartridge.
Portable, removable data storage for many projects.
Organized as 16 banks of 32k bytes each for 28-pin JEDEC compatibility.
Attach a ribbon cable and insert into existing JEDEC 28-pin EPROM socket (250nsec).
More flexible than EPROM. More memory than EEPROM. Easier (and <1/2 the price) of PCMCIA.
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Plastic case (approx. 3"x2.25"x0.5") contains PCB and 2 Lithium Batteries.
Date Code 1991, but batteries check good and may be replaced easily.
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