    AST RESEARCH, INC.         TECHNICAL BULLETIN #0771                  08-12-92

                               AT&T UNIX AND AST SYSTEMS

    PROBLEM:       Cannot boot with AT&T UNIX System V/386 Release 4.0 Version
                   2.1.

    CAUSE:         AT&T UNIX interprets an SMC floppy controller as a 82077
                   controller when in fact it is a 37C65. This puts the 37C65
                   part into an invalid mode causing a "panic error".

    SYSTEMS
    AFFECTED:      All systems using an SMC floppy controller.

    SOLUTION:      AT&T only supports AT&T machines with AT&T UNIX.  Therefore,
                   AST cannot support the Operating System and recommends that
                   customers use SCO UNIX System version 3.2.4, Microport SVR4 or
                   other upcoming UNIX's which will support AST systems.