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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