Memorex doesn't make their own DVD players, they re-badge other companies DVD players, the net result being that all of their players use different remote control codesets. Therefore, in order for anyone here to have any chance of finding you the right code, they would need to know the exact model number of your Memorex DVD player.

Furthermore, Comcast uses more than one vendor for their remote controls, so we would also need to know the model number of your Comcast remote. Here is a page that displays many of the remotes tha Comcast uses, if you see your remote there please tell us the name of it, and please quote it exactly as there are several remotes with similar names.

[Link: comcast.com]