They do predate HD as we know it, and definitely with respect to analog I/O. I've never had the chance to look at whether an MPEG2 transport stream is "just data" and it and the recorder doesn't care what the resolution is, HD or SD... or if there's a limitation on which transport streams it will accept and regurgitate. I guess you gotta find one, buy it, and test it. Happens some times.
The Sharp flat panel I referred to above was a 720 screen, and did have an ATSC tuner along with NTSC, and it would display an HD 1394 transport stream, but that doesn't answer the D-VHS question.
Chip
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