NetBSD/hp300: Clubfoot Serial Breakout for Series 400 Workstations
This information was provided courtesy of Klaus Klein <kleink@serpens.de>
SIO1 is a
dca
device and can run at up to 38400 bps with hardware handshaking and has a FIFO.
Use /dev/tty0.
SIO2 and SIO3 are apci
devices and can run at up to 19200 bps. They have no hardware handshaking
or FIFOs. Use /dev/ttya0 and /dev/ttya1.
| 9000/400 Pin # | SIO # | Signal | Breakout Pin # |
| 1 | any | protective GND | 1 |
| 2 | 1 | TxD | 2 |
| 3 | 1 | RxD | 3 |
| 4 | 1 | RTS | 4 |
| 5 | 1 | CTS | 5 |
| 6 | 1 | DSR | 6 |
| 7 | any | signal GND | 7 |
| 8 | 1 | DCD | 8 |
| 9 | 3 | RxD | 3 |
| 10 | 3 | CTS | 5 |
| 11 | 1 | n/c | - |
| 12 | 2 | TxD | 2 |
| 13 | 2 | RxD | 3 |
| 14 | 2 | RTS | 4 |
| 15 | 2 | CTS | 5 |
| 16 | 2 | DCD | 8 |
| 17 | - | n/c | - |
| 18 | 2 | DTR | 20 |
| 19 | 3 | DTR | 20 |
| 20 | 1 | DTR | 20 |
| 21 | 3 | TxD | 2 |
| 22 | - | n/c | - |
| 23 | 3 | RTS | 4 |
| 24 | - | n/c | - |
| 25 | 3 | DCD | 8 |
A serial port expansion cable with the wiring described above used to be available from Hewlett-Packard as K2292 (frequently referred to as "Clubfoot"), but I have no information whether it still is or not.
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