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mdc(4) [ultrix man page]

mdc(4)							     Kernel Interfaces Manual							    mdc(4)

       mdc - DS5100 serial line driver

       device	 mdc0	  at ibus?     vector mdcintr
       device	 mdc1	  at ibus?     vector mdcintr
       device	 mdc2	  at ibus?     vector mdcintr

       A  DS5100 base system (mdc0) provides four asynchronous ports.  An optional asynchronous card (mdc1 and mdc2 ) can be added to supply eight
       additional ports.

       The mdc ports are used as follows:

       Port    Usage			  Connector

       0       Console port		  6-pin MMJ on CPU board
       1       Local terminal		  6-pin MMJ on CPU board
       2       Full modem control port	  25-pin D-Sub on CPU board
       3       Local terminal		  6-pin MMJ on CPU board

       An optional asynchronous board provides an additional eight lines:

       4       Local terminal		  6-pin MMJ
       5       Local terminal		  6-pin MMJ
       6       Full modem control port	  25-pin D-Sub
       7       Local terminal		  6-pin MMJ
       8       Local terminal		  6-pin MMJ
       9       Local terminal		  6-pin MMJ
       10      Local terminal		  6-pin MMJ
       11      Local terminal		  6-pin MMJ

       The console baud rate is set to 9600 baud by default.  You can change this by setting the baud environment variable  from  console  prompt.
       Each  communication  port  from	the  serial  line controller behaves as described in the reference page and can be set to run at any of 16
       speeds.	For the encoding, see

       You can establish the state of port 2 (port 6) by specifying either modem or nomodem as part of the file entry.

       The speed default is to 9600 baud on the console port.  The console device must be set for 8-bit character length with one stop bit and	no
       parity. The driver enforces these restrictions; that is, changing speeds with the command may not always work on console ports.

       Console terminal

       Full modem control or local terminal

See Also
       console(4), devio(4), tty(4), ttys(5), MAKEDEV(8)

								       RISC								    mdc(4)

Check Out this Related Man Page

scc(7)							 Miscellaneous Information Manual						    scc(7)

scc - Serial keyboard/mouse/communications interface SYNOPSIS
controller scc0 at tc0 slot 3 vector sccintr DESCRIPTION
Two base board Zilog scc dual UARTS provide DEC 3000 series personal systems with keyboard, mouse, and serial communications interfaces. The serial communications interfaces can operate at baud rates from B50 to B57600 (see tty(7)). The driver for the scc interface supports hardware flow control using the Request to Send (RTS) and Clear to Send (CTS) signals. When hardware flow control is enabled, the flow of input data is controlled by the RTS signal and the flow of output data is controlled by the CTS signal. If the CTS signal is off, the driver will suspend output to that line until the CTS lead is reasserted. Likewise, the driver will turn off the RTS lead to tell the device connected to the line to stop sending data as a result of congestion on the host side. When the condition clears, the driver will turn on the RTS lead to tell the device to resume sending data. In alternate console configurations (that is, no graphics head), communications port 2 (/dev/tty01) becomes the system console. The serial system console port always operates at 9600 BPS, 8-bits, no parity. No modem or hardware flow control is supported. RESTRICTIONS
Data communications equipment attached to the console serial port in alternate console configurations must be set to 9600 BPS, 8-bits, no parity. The scc driver enforces this restriction. Only communications port 1 (/dev/tty00) includes full modem control. FILES
console terminal local terminal local terminal RELATED INFORMATION
console(7), devio(7), modem(7), tty(7), MAKEDEV(8) delim off scc(7)
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