If you're looking for a 33-foot S-Video 4-Pin Male to 4-Pin Male High-Performance Cable then the InFocus cable might be what you're looking for. With an extensive list of compatible products by InFocus, ASK Proxima and Screenplay there is a good chance that this cable will work with your equipment.
These cables are standard s-video cables and support NTSC video as well as standard s-video signals. They also come with a 90-day warranty from the date of purchase.
Look for this cable to be compatible with
InFocus: LP70+, LP120, LP540, LP600, LP640, LP815, LP820, LP840, LP850, LP860, X1A, X2, X3
ASK-Proxima: M1, M2+, C110, C160, C170, C180, C410, C420, C460
Screenplay: SP-4805, SP-5000, SP-5700, SP-7205, SP-7210