ZSC(4)

NAME
zsc - Zilog 8530 (ZSCC) serial communications driver

SYNOPSIS
zsc0 at obio?
zstty* at zsc?

DESCRIPTION
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 an 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
/dev/ttya
/dev/ttyb

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

BUGS
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.