Jim:
Here's an additional information page:
RCA MM61110
And here's some relevant excerpts:
The RCA Digital High-Resolution Monitor is a true SYNCROSCANâ„¢ display. This gives you professional quality monitor capability with a system that automatically detects signals with video display requirements from 15.7 kHz to 37.7 kHz. Connecting your computer to the (S)VGA input delivers 480,000 pixels of resolution.
The RCA Digital High-Resolution Monitor can display 1080i (interlaced) television signals (1,330,560 pixels) when you combine this television with an RCA DTC100 HD/Digital Receiver.
The way I interpret this is that you can connect a conventional PC without any special software or hardware to the VGA connector and you will receive SVGA resolutions (800x600) 480,000 pixels. The resulting image should use the full 4:3 display area without letterboxing.
Connecting a properly equipped HTPC with special software (i.e., PowerStrip for custom resolutions, YXY for aspect ratio control, etc.) and suitable graphics cards (Radeon or GeForce, etc.) to the component inputs will accommodate 540p/1080i HD resolutions (1,330,560 pixels). To connect to the component inputs will require an RGB to component transcoder. It is also likely that when connecting a 540p/1080i signal to the component inputs the raster will compress to the 16:9 aspect ratio giving you a letterboxed image. Therefore a portion of the large 61" 4:3 display will likely be filled with black or gray bars giving you a 56" display.
This digital TV can not display 720p since its maximum horizontal scan rate is 37.7 Khz and 720p requires 45 kHz.
Larry