The Pacific Data / OKI MSC23136-80DS12 4MBx36 FPM 72-pin SIMM Module is a high-quality memory module. With a total capacity of 4 MB and a bus speed of 80ns, this SIMM module provides reliable performance for your computing needs. Manufactured by OKI in Japan, this unit is a single module with 72 pins, ensuring compatibility and stability in your system. Upgrade your computer's memory with this dependable and efficient FPM DRAM module.