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NetBSD 6.1.5 - man page for ast (netbsd section 4)

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AST(4)				   BSD Kernel Interfaces Manual 			   AST(4)

NAME
     ast -- multiplexing serial communications interface

SYNOPSIS
     ast0 at isa? port 0x1a0 irq 5
     com2 at ast? slave ?
     com3 at ast? slave ?
     com4 at ast? slave ?
     com5 at ast? slave ?

DESCRIPTION
     The ast driver provides support for boards that multiplex together up to four EIA RS-232C
     (CCITT V.28) communications interfaces.  Apparently the original maker of hardware using
     this multiplexing protocol was AST.

     Each ast device is the master device for up to four com devices.  The kernel configuration
     specifies these com devices as slave devices of the ast device, as shown in the synopsis.
     The slave ID given for each com device determines which bit in the interrupt multiplexing
     register is tested to find interrupts for that device.  The port specification for the ast
     device is used to compute the base addresses for the com subdevices and the port for the
     interrupt multiplexing register.

FILES
     /dev/tty0?

SEE ALSO
     com(4)

HISTORY
     The ast driver was written by Roland McGrath and placed into the public domain.

BSD					  March 30, 1994				      BSD
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