Help with Sun video

[Tony Duell]

> 
> I'm hoping someone can shed light on this.  For the past week, I've been 
> battling to get my Sun Ultra-60 video switchable through a Belkin 8-port 
> KVM switch.  The monitor is a Samsung 214T 20" LCD.
> 
> - Connect monitor directly to workstation with a 13W3 Sync-On-Green 
> adapter (no passthrough of sync signals):  Works fine.
> 
> - Connect monitor directly to workstation with a 13W3 adapter that brings 
> out H+V sync:  Works fine.

Does this adapater do anything to the green signal? Is it possile that 
the monitor is still using sync-on-green and ignroing the H and V Syncs 
from the adapter (if, indeed, they're even active)?

> 
> - Connect either of the above to a port on the KVM switch:  Switch does 
> not recognize that anything is connected and refuses to pull in the relay 
> (I can hear an audible click from any channel with recognized video).  The 
> status LED on the KVM keeps flashing to say "no one there!".  Obviously no 
> video.
> 
> - Purchase Belkin Sun adapter box from eBay and connect it between the U60 
> and the KVM: KVM recognizes that video is there and pulls in the relay. 

Does this just connect ot the video port on the switch, or to the 
keyboard and/or mouse ports as well? It wouldn't suprise me if checking 
for +5V on, say, the keyboard port was part of the 'I have a computer 
connected' detection.

If it does just connect to the video port, it's possible that the swithc 
needs active sync signals on the H and/or V lines. Have you stuck a 
'scope on the outputs of the adapter to see just which signals are active?

> The monitor _seems_ to believe that something is there, as the blinking 
> green "nothing attached to me" LED goes solid on.  However, nothing ever 
> appears on the screen.  I tried all DIP switch settings on the adapter 
> (connected to Sun monitor sense lines).
> 
> - In desperation, connect monitor directly to HD15 port on the Belkin 
> adapter:  Same thing.  Solid green LED, no display.

Do you use the same connector on the monitor in all tests, or are the 
first 2 using BNC sockets or similar? It's possible the the monitor 
wi;ll not accept sync-on-green over the DE15 connector. 

It would be intereting to know what, if anything, is coming out on the H 
and V lines of that adapter

-tony