On Oct 30 2004, 17:02, Vintage Computer Festival wrote: here. for the connector, Not for that make/model, but for a DEC DLV11-J, yes. The DLV11 is a single RS232 interface, by the way, and the DLV11-J has 4 serial lines. Looking into each 10-pin socket, the pinout is: _____________________ | | | 9 7 5 3 1 | | | | 10 8 6 4 2 | |_____________________| 1 UART clock in or out (not normally connected) 2 Signal ground 3 Tx + 4 Tx - 5 Signal ground 6 Index position - no pin 7 Rx - 8 Rx + 9 Signal ground 10 +12V via fuse F1 (if fitted) The receivers are differential. If you're using them for an RS-232 device, connect a link between pin 7 and one of 2, 5, or 9, to make the RX- line ground-referenced, then use 3 for TxD and 8 for RxD. Loopback connectors for testing usually jumper 3 to 8 and 4 to 7 (RS-422 mode) but sometimes jumper 3 to 8 and 7 to 9 (RS-232 mode). On a DEC DLV11-J, there are several wirewrap jumpers to set baud rate, word length, address, etc, and also two to set channel 3 to the console address, if required. Channel 3 is the connector nearest the left as you look into the back of a machine, with the board fitted component-side up. The jumpers are labelled C1 and C2; link X to 1 if you do want the console on channel 3, or X to 0 if you don't. There's also a set of three labelled B/X/H which determine what happens if you send a break if Ch.3 is the console. Jumpering X to B makes the system boot (it grounds the BINIT line), jumpering to H makes it halt (grounds the BHALT line). Leave it disconnected if you don't want either action. It will run it very well. Several of my 11/23s came with RT-11 of one flavour or another. -- Pete Peter Turnbull Network Manager University of York