Zenith Z-100 Users Manual Winchester Supplement, Vintage 1985, with Z-100 Winchester Disk Utilities (5.25" Diskette), Used, in good condition, Diskette S/N 000-00107386-6-01, and no apparent flaws. In addition is a large sheet 1 of 1 of the Z-217 Winchester Disk Controller Board Schematics, included with a separate Z-217-1 Technical Manual, Vintage 1984, labeled on back cover: 595-2014-01, which describes the 2 PC Circuit Board pairs of the Disk Driver Controller of the Z-217-1 (that has Descriptions and Diagrams). Have been in storage and cleaning out storage and are no longer needed. There are additional user working copies of the diskette. Mailed by Media Mail. For USA only, Sold as is, No returns, and email me if you have questions.