VCB02 woes in a MicroVAX III

I'll attempt to keep a long story short here: I have over the past few years been putting together a MicroVAX III; I have a KA650-B CPU, 16MB of memory, a CMD SCSI interface and a DEQNA ethernet interface. A couple of years back I got a VCB02 and finally this week I got ahold of a BC18Z cable so that I can actually connect the VCB02 to a monitor/keyboard/mouse :). I've got everything installed and wired up this evening, the problem is, I can't seem to get it working. On powerup, the monitor syncs with the video signal the VCB02 is sending out (and I get a brief screen with some garbage on it followed by a black screen), and the keyboard emits a couple of very short beeps during the diagnostic cycle, but the MicroVAX doesn't seem to acknowledge the existence of the VCB02. All diagnostics pass. So, a few questions: - Is there a specific ROM version I need in order for the KA650 to recognize the VCB02? I have V1.2/0123 which seems pretty early (given that I've seen references to 5.3 on the 'net). If so, anyone know where I can find a dump? - What keyboards is the VCB02 compatible with? I'm using it with an LK201 from my VT220 currently, and all four LEDs are lit constantly, which starts me to wondering... - Are there any restrictions on slots/card ordering I should be concerned with? This is in a BA23 backplane (which originally housed a MicroVAX I) Thanks! Josh