Artifact Details Title IBM 305 RAMAC pocket reference card Catalog Number 102656909 Type Physical object Description Object is a stiff paper pocket reference card for the IBM 305 RAMAC system. Front has instruction timings and operation codes. Reverse drum layout and details of multiplication and compare instructions. Manufacturer International Business Machines Corporation (IBM) Place Manufactured U.S. Dimensions 1/16 x 2 1/2 x 3 3/4 in. Category Ephemera/other