Sharp MZ-80B Owner's Manual page 43

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3.1.1 Installing the Expansion RAM
The 32K byte expansion RAM card , MZ-80RM , is inserted in the 20 pin connector on the CPU
board as shown in FIGURE 3.1 . This connector is located on the right rear side of the CPU board as
viewed from the rear. The standard 32K byte RAM card is already installed beside the expansion RAM
connector. The connector pins on the bottom of the expansion RAM card can be inserted into the 20
pin connector on the CPU board.
The connector cannot be inserted backwards. Visually check orientation of the expansion RAM
card before inserting it. See FIGURE 3.4.
FIGURE 3.4