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Full Discussion: Serial Lines Explained
Top Forums UNIX for Dummies Questions & Answers Serial Lines Explained Post 302930455 by sreyan32 on Sunday 4th of January 2015 11:15:36 AM
Old 01-04-2015
Okay from what I have read in this thread I can understand that in the older days you would have a monitor and a keyboard with a serial port connecting to the central CPU. You would communicate with the CPU using signals sent via the serial port. I know this is an over simplification but is it correct ?

Can someone explain how serial ports can be used for session control in a little more detail ?

What baffles me is that is why still use serial ports ? Why not remove them ? On a normal desktop or laptop serial ports are not used the way they were used back in the olden days, so keep them ?

For example as Corona688 mentioned in a earlier thread
stty still gives the baud rate. This is not required so why still keep it.

Why adopt an old standard forcefully when it is not required is my point
 

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iscc(7) 						 Miscellaneous Information Manual						   iscc(7)

NAME
iscc - serial communications interface SYNOPSIS
controller iscc0 at isa0 DESCRIPTION
An onboard Zilog 8530 DUART provides AXPvme-based Single Board Computers with console (CON) and auxiliary (AUX) serial communications ports. Both serial communications ports can operate at baud rates from B50 to B38400, excluding B134 (see tty(7)). On AXPvme Single Board Computers configured with a graphics head as the system console, the CON serial communications port (/dev/tty01) is available for use by application programs as an additional communications port. In the absence of a graphics head, the CON serial communications port (/dev/console) becomes the system console. When used as the serial system console, the CON serial communications port always operates at 9600 BPS, 8-bits, and no parity. Regardless of system console, the AUX serial communications port (/dev/tty00) is always available for use by application programs. RESTRICTIONS
Data communications equipment attached to the CON serial communications port must be set to 9600 BPS, 8-bits, no parity when configured as the serial system console. The iscc terminal driver enforces this restriction. No modem control is supported for either the CON or AUX serial communications ports. FILES
console terminal local terminal local terminal RELATED INFORMATION
console(7), devio(7), tty(7), MAKEDEV(8) delim off iscc(7)
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