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AB-Semicon's Dual Ported S-RAM devices have been specifically developed to allow low cost implementations of Peripheral device interfaces which made use of dual ported RAM technology to transfer packets of data in the most efficient way between two processor systems. There are two devices available:

AB 9941 - a 25ns fast 4k x 8bit dual ported S-RAM
AB 9941 Datasheet

AB 9961 - a 25ns fast 4k x 8bit or 2k x 16bit or 4k x 8 to 2k x 16bit bus translator dual ported S-RAM
AB 9961-2 Datasheet