    AST RESEARCH, INC.         TECHNICAL BULLETIN #0809                01-11-93

                         POWER EXEC SL COM PORT COMBINATIONS

    Due to a design limitation of the Intel 360SL, (the peripheral controller
    chip for the 386SL and 486SL processor), the Power Exec does not support
    sharing of interrupts 3 and 4.  This means that only certain configurations
    are supported.  Listed below are the configurations supported by the Power
    Exec:

         COM1 alone
         COM2 alone (PCMCIA configured as 2 or serial device using a Dock Box or
         Docking station)
         COM3 alone (PCMCIA card)
         COM4 alone (PCMCIA card)
         COM1 and COM2
         COM1 and COM4 (PCMCIA)
         COM2 (Dock Box or Docking Station) and COM3 (PCMCIA)