There is a slide switch on the back that selects the output to be 400p or 1080i. But as far as I can see, the aspect ratio is set by the broadcaster.
I don't have a Toshiba but the Sony 36xbr400. The Sony will not display 720p. The Samsung SIR-T150 does. The slide switch on the back of mine has four settings. 480i, 480p, 720p, and 1080i. So the SIR-150 will down-convert HDTV signals to 480i or 480p if the set will support 480p.
The setup menu will allow selection of Aspect ratio 16:9 or 4:3 and full or zoom too.
ps. decided to post this anyway since it was already typed (someone may find it useful) didn't realize you guys were talking about the SIR-T100 till typed. Sorry.
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