The SPX 800 doesn't do tape. Why should the HDX200 do tape? The whole idea of P2 is to get away from tape. A single P2 slow would be suicidal for P2 - I'd hope for 3 slots, but you could just about use 2 slots.
I know Sony did 4xDVCAM playback for news ingest over SDTI - but I don't think it recorded at that speed though, only playback.
Graeme
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http://www.nattress.com - Film Effects for FCP