    AST RESEARCH, INC.         TECHNICAL BULLETIN #0779                  09-25-92

                  PREMIUM SE 4/33 AND MAYNARD INTERNAL TAPE ADAPTER

    PROBLEM:       When using a Maynard (2000 DAT) Tape Backup with a 16-bit
                   internal Maynard SCSI adapter the system hangs.

    CAUSE:         The problem is caused by the Maynard SCSI controller cards
                   (part number 08-9-6010000 revision 3) that uses an AMD 33C93
                   chip at location U12.  This chip generates noise which results
                   in an un-requested interrupt causing a system hang.

                   Maynard controllers shipping with a WD 33C93A chip at location
                   U12 do not have this problem.

    AFFECTED
    SYSTEMS:       Premium SE and Premium TE systems with EISA motherboards (part
                   number 202377-00X).

    SOLUTION:      Contact Maynard Technical Support at 800-227-6296 for further
                   information and resolution.