NAME    [Toc]    [Back]

     zsc - Zilog 8530 (ZSCC) serial communications driver

SYNOPSIS    [Toc]    [Back]

     zsc0 at obio?
     zstty* at zsc? channel ?

DESCRIPTION    [Toc]    [Back]

     The zsc driver provides support for Z8530-  and  Z85230-compatible EIA
     RS-232C  (CCITT  V.28)  Dual  UART chips.  The Z8530 has a 3
character
     buffer, while the Z85230 has a 8 character buffer.  However,
due to limitations
 in the design of the Z85230, the driver is unable to
distinguish
     it from the Z8530 and will not enable any enhanced  features
of the device.


     Input  and  output for each line may be set to any baud rate
in the range
     from 50 to 115200 (though some  machines  will  not  support
more than 38400
     reliably).

     The  zstty  driver provides a terminal interface, supporting
all the standard
 tty(4) ioctl calls.

FILES    [Toc]    [Back]

     /dev/ttya
     /dev/ttyb

SEE ALSO    [Toc]    [Back]

     ioctl(2), intro(4), obio(4), tty(4)

BUGS    [Toc]    [Back]

     Due to the small character buffer on the  Zilog  8530  chip,
the driver has
     very  strict  latency requirements for its interrupt service
routine.  As a
     result, data loss may occur when using high speeds, particularly on older
     (68020 or 68030) Macintosh models and on busy systems.

OpenBSD      3.6                           March      8,     2004