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9845T 1838A06653
09845-66590 is 512 MB RAM, included in 98407A option upgrade kit, along with 1898, 1899, 1591 and 1592 ROMs and white ejector handles.
RAM - 1 09845-66590, white and black ejector handles, 64 Mitsubishi 4164
RAM-ROM - 09845-69529 (updated 99529?), white ejector handle - includes 1898 (CE4 LB) and 1899 (CE4 LB), 1591 (CE1 LB), 1592 (CE1 UB)