12-01-2006
Quote:
Originally Posted by System Shock
You can plug-unplug terminals into any Sun box and it's not going to go to the ok prompt just for that.The problem used to be that, if you powered off the terminal before disconnecting the serial cable, or powered on the terminal after connecting the serial cable, that would send a break signal to the console, thus bringing the box to the ok prompt.
Hmm, have you ever tried it when the console is a keyboard? Also the electrical glitch of unplugging a serial console can do this and as Perderabo already mentioned it was patched so the key sequence could be a little more complex resloving many of these issues. I have personally seen this happen in the past 12 months with the standard break enabled.
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scc(7) Miscellaneous Information Manual scc(7)
NAME
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)