I have a 1992 and, yes, the GPIB interface works. However, it's not SCPI. Don't know if that matters with {lab,bench}view.
SK4 is the socket designation on the main board for the ribbon cable to the GPIB card. There is a jumper next to it, set as shown on mine. I'm not sure what the jumper does. It's probably described in the service manual.
My GPIB address switch is set to all down, except position 4 which is up (DDDUDD). That sets address 4 and disables talk-only mode (normal mode).