Very Rare Early Vintage Memory256K 30-Pin MemoryListing is for Two (2) modules 256k each512K Total Ram80/100ns 256k Chips9-chip ParityFPM SIMMsITEM DESCRIPTION: 30pin but are longer than standard simms, they do fit in the standard 30 pin slot
see pics for the unusual way they added the 9th chip :)

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