DATA 1209s units were limited and as I recall 1080p60 was the limit.
GRAPHICS 1209s units run higher bandwidth. Back in the day of the "twin" forum, I ran my GRAPHICS 1209s up PAST a 400Mhz signal !!! This was just to see what the PJ could accept and was in no way based on quality, this was a standard 1209s GRAPHICS.
IF the Runco unit happens to be based on the DATA version then you need to swop FOUR of the boards out and the firmware. Greg knows this.
Curts site mentions the DTV1100 is a Graphics 1209s in the specs - From what you are saying that might be a DATA 1209s. There are very few Data 1209s, Most appear in the UK, I have changed all Data 1209s I have had into graphics 1209s.
In fact I have just checked Curts site and there is no mention that I can find in the Barco PJ list of the DATA 1209s - There do Exists I have had at least 4.
Could you open the lid, flip open the TUBE area cover and post a picture of the SCAN WIDTH coil board, large board on back of TUBE area cover.
Could it be the Runco DTV1101 was the Graphics 1209s version???
Either way if your Runco does not go beyond 1080p60 it will be VERY soft at that, the Graphics is much better. Greg will mod the Graphics as well.
Maybe start another thread or by all means PM me.