Pinouts for Vaxstation 3100 monochrome cable?

Hi, all. I have a vaxstation 3100 m38 running NetBSD, and I'd like to be able to use the local monochrome display. I've removed the SPX color adapter, and made up a cable according to the pinouts on Kee's VS3100 page. His pinouts are composite on pin 9 and ground on 3 for a BC23K-03 cable. However, with the cobbled cable attached, I don't get any output. Question 1: Did I miss a jumper on the mainboard? Question 2: I assumed that the pins were numbered in the same order as an AUI ethernet connector. Looking at the female, I have 1-8 right-to-left, and 9-15 R-t-L. Is this correct? Question 3: I'm using an IBM Power17 display. Multisync, separate-sync, composite-sync and sync-on-green capable, I would think it would work with mono input on the green. It does work fine with the SPX adapter. Question 4: I also have a Digital VR160 display, but everything I've read implies that it won't do monochrome. Is that true? Has anybody been successful with a monochrome display on this box? Any help would be most welcome. Doc