Artifact Details Title DS990 model 2 system summary Catalog Number 102784623 Type Document Date 1979 Publisher Texas Instruments Incorporated (TI) Place of Publication Houston, Tex. Identifying Numbers Part number TI-592-20M-2/79 Extent 2 p. Category Promotional Material Collection Title Al Kossow collection Credit Gift of Barbara Seidel Lot Number X6515.2012