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NetBSD/hp300: 98561-61604 DCA Serial Cable for System Interface Boards

The DB9 connector on the System Interface Boards is not a normal 9 pin serial port. HP had a special cable to connect with normal DB25 serial cables (part number 98561-61604). This is a dca device. Use /dev/tty0.

You can use a normal non-null cable if you're willing to sacrifice hardware handshaking.

Pinout description

DB9M Pin # DB25F Pin # DB25F Pin # (for normal 9<->25 cables) Signal Name
1 20 8 DCD
2 2 3 RxD
3 3 2 TxD
4 4 20 DTR
5 5 7 Signal GND
6 6 6 DSR
7 7 4 RTS
8 8 5 CTS
9 22 22 RI
GND 1 1 Protective GND

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