> >> When it POSTs the frame buffer complains about a "red screen test"
> >> and then the >> prompt appears. Doing a cnfg 0 shows the buffer,
> >> what is this error and should I worry about it?
> >
> >        That means that there is no 75 Ohm termination on the red
> >        video
> > output. There is (at least on red) a comparator on the RAMDAC
> > output. The PROM monitor on the PMAGB-B enables the red output
> > current, checks if the comparator bit is set (too high output
> > voltage = no termination) and complains. If you connect a monitor
> > (or better yet pull the framebuffer if you are not using it) you
> > will not get that error...
> 
> That makes sense(!)  I have one DECstation document instructs to
> connect two BNC terminators when standard 3W3->3BNC video cable is
> hooked with a monochrome display with 1 BNC input. 
> 
> Tohru Nishimura

I can confirm this. I had to terminate the red wire to get the machine 
to boot automatically, when using an EIZO Flexscan 21" greyscale 
monitor and my PMAGB-BA (An otherwise perfect monitor if I 
compare it with my DEC 19" color monitor which I use now) 

Joachim Buss.