This kit contains the chip to replace the dip shut at location U72 (Model 4 NGA) plus eight 64K x 1 memory chips to upgrade to a total of 128K.

Make and model of RAM will vary, but each batch will be a matched set of 128 cycle/2ms chips, tested in a stock 64K NGA Model 4 computer for 24 hours prior to shipping to ensure correct operation.

U72 is the GAL equivalent of the original PAL supplied in the original upgrade kit.
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