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dc(7) [osf1 man page]

dc(7)							 Miscellaneous Information Manual						     dc(7)

NAME
dc - serial line/mouse/keyboard SYNOPSIS
controller dc0 at ibus0 slot 0 vector dcintr DESCRIPTION
The dc serial line controller provides DECstation 2100, DECstation 3100, DECstation 5000, and DECstation 5100 computer systems with key- board, mouse, and serial communications interfaces. The serial communications interfaces on the DECstation 2100 and DECstation 3100 provide partial modem control. The serial communications interfaces on the DECstation 5000 provide full modem control. The device special file /dev/tty01 on a DECstation 5100 provides full modem control, while the remaining ports provide no modem control at all. All serial commu- nications interfaces operate at baud rates from B50 to B9600, excluding B200. The dc ports are used as follows: Usage Graphics device keyboard at 4800 BPS Mouse or tablet at 4800 BPS Communications port 1 (w/modem control)/local terminal Communications port 2 (w/modem control)/local terminal On all systems except the DECstation 5100, serial port 2 is used for the system console port in server (that is, non-graphics) configura- tions. On DECstation 5100s, the serial port labeled 3 on the back of the system is always the system console port. The serial system con- sole port always operates at 9600 BPS, 8-bits, no parity; modem control is not supported. RESTRICTIONS
Data communications equipment attached to the console serial port in server configurations must be set to 9600 BPS, 8-bits, no parity. The scc driver enforces this restriction. FILES
console terminal local terminal local terminal local terminal (DECstation 5100 only) RELATED INFORMATION
console(7), devio(7), tty(7), MAKEDEV(8) delim off dc(7)

Check Out this Related Man Page

SCC(4)							   BSD Kernel Interfaces Manual 						    SCC(4)

NAME
scc -- Zilog 8530 Serial Communications Controller interface SYNOPSIS
scc* at ioasic? offset ? DESCRIPTION
The scc driver provides support for the Zilog 8530 Serial Communications Controller (SCC) via the IOASIC found on DECstation 5000 models in the /100, /20, and /240 series (supported by NetBSD/pmax). Each SCC device has two serial ports. The DECstation 5000 model 20 provides one SCC device. Other models provide two, but one port of each device is dedicated to mouse and keyboard input, respectively. Input and output for each line may set to one of following baud rates: 50, 75, 110, 134.5, 150, 300, 600, 1200, 1800, 2400, 4800, 9600, 19200, 38400, or 57600. Speeds up to 230400 are supported by the chip and the motherboard, but speeds higher than 57600 do not work reliably without an external clock signal. FILES
/dev/ttya /dev/ttyb /dev/ttyc /dev/ttyd The mapping from units to serial-hardware outlets is idiosyncratic. The even ports are wired serial connectors and the odd-numbered ports are reserved for mouse and keyboard. On machines with one port like Personal DECstations, the single device is ttya. On the 5000/1xx and 5000/2xx, the first serial port (default serial console) is ttyc and the second port is ttya. SEE ALSO
intro(4), ioasic(4), ttys(5), MAKEDEV(8) HISTORY
The scc driver first appeared in 4.4BSD. The scc driver was also used for the IOASIC SCC found in DEC Alpha model 3000 TurboCHANNEL based systems; NetBSD/alpha has since been con- verted to use the machine-independent zstty(4). BUGS
The IOASIC provides internal DMA channels that can be programmed to transfer up to 4096 bytes of data into, or out, of an SCC without further software intervention. This feature of the IOASIC is not yet supported. The mapping from device-special files (major and minor number) to chip and port is arguably backwards. ULTRIX tries to hide the hardware mapping, but NetBSD does not. Users wanting to use ULTRIX compatible tty names /dev/tty0 and /dev/tty1 for the scc comm-port lines should make links or device-special files which match their hardware setup. BSD
April 24, 2003 BSD
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