I just wanted to document that I've got 240p downscaling working with a Barco Folsom Imagepro (1st Gen SDI in my case).
I was looking at scalers with 15khz horizontal frequency capability and came across this.
Some documentation about it on here so thought I'd try finding one and managed to get 2 of them for 70gbp on Ebay.
Initially I found it difficult to programme as I'm a complete novice and you can't adjust horizontal frequency on these units which was frustrating. However, after watching marcoretros video on the Iscan HD, I tried inputting those settings into the Barco (didn't require additional horizontal frequency adjustment) and managed to get a 240p output!
It's a bulky unit but the physical controls are excellent.
S-video and composite out too but only do 480i.
A little bit of an effort to get the settings on but the quality is great and easy to manipulate the image.
Below pictures are not really representative of the quality:



