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There were major differences in color method and color carrier frequency, frame rate and frequency, number of scan lines. The Samsung was the only one I know of that would convert from one format to another on the fly so you could receive NTSC off the air with its tuner and record one of the other formats on the tape, in case for example you wanted to record American TV shows and send to your friends in England or France. It did that digitally. Other multi-standard VCRs would only play back at whatever the format of the tape was so you had to use a multi-standard TV with those. That Samsung was pretty sophisticated, too bad it had so many failures but the ones I fixed helped pay the bills!
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