01-04-2009
It's a TTY port
Section 2.15.5 of the redbook REDP-4138 (p5 550 and 550q Tech Overview ) has a diagram of the operator panel which looks just like your diagram. The book labels this port as Serial Port 1 alternate connector. It is used to attach a TTY console to the system unit without getting around behind it. You would normally administer this system from an HMC, so this port is not especially useful. But there are some functions such as ASMI access that can be performed from a TTY. I've never done it, but I think if the system is configured as a full-system LPAR, then this would be the tty0 port.
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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)