HTY(7)              RISC/os Reference Manual               HTY(7)



NAME
     hty - High level driver for Systech Serial Communications
          Controller

SYNOPSIS
     VECTOR: module=hps intr=rhpintr vector=0x40 ipl=2 unit=0

DESCRIPTION
     Each Systech serial controller provides 16 serial ports and
     one Centronics parallel printer port for VME bus based
     machines. Current software supports up to four controllers
     on a single machine.

     Each line attached to the Systech controller behaves as
     described in tty(7).  Input and output for each line may
     independently be set to run at any of a number of speeds;
     see tty(7) for the encoding.

     Each device file (/dev/ttya*) has a corresponding modem dev-
     ice file (/dev/ttyma*).  Modem device files will wait for
     Carrier Detect from a modem to be true before returning on
     an open(2), unless FNDELAY is set in which case the open
     returns immediately, regardless of the state of Carrier
     Detect.  Modem files also default to rts/cts flow control as
     compared to non-modem files which default to xon/xoff flow
     control.

     Several different controller configurations may be supported
     in the future and thus the driver is split into two drivers.
     The upper level (hty) supports asynchronous ttys, while the
     lower level hps is independent of the protocol being used.

FILES
     /dev/tty[m]a[0-63]
     /dev/syslp[0-3]
     /etc/tcs_load
     /etc/tcs6236.dnl

SEE ALSO
     hps(7)
     tty(7)














                        Printed 11/19/92                   Page 1