    AST RESEARCH, INC.         TECHNICAL BULLETIN #0646                  11-15-90

                            TAPE DRIVE MOUNTING PROBLEMS

    Installation problems have been reported using AST external drive mounting
    brackets (part number 200434-001) and certain tape drives in early Tower
    systems.  The problem is caused by a mechanical alignment incompatibility
    between these brackets and TechMar, Cipher Wangtek (model 5150E) and Archive
    (model 2150S) tape drives.

    AST has resolved this problem with a new design of external mounting
    brackets (part number 200582-001), which are now shipped with all Premium
    computers housed in the Tower chassis.  In addition, these brackets are
    shipped with computers housed in the mid-size chassis (i.e., Premium II and
    Bravo 486).

    Users of AST Premium Computers experiencing problems, when installing any of
    the above tape drives in AST Premium systems that require external drive
    mounting brackets, should contact an AST Service Center or AST Product
    Support to obtain new brackets.