In message <19980105.013549.3022.5.mkeitz@juno.com>, Mike Keitz writes >On Sun, 4 Jan 1998 16:17:08 -0600 Martin McCormick > writes: >> I believe that if the field switch was made during the >>vertical >>blanking interval, one would run the risk of loosing all the digital >>information such as VIR, Closed Captionning, Teletext ,etc > >I think VCRs were invented well before that stuff was in widespread use. >Thinking about it some more, it would be important to have the vertical >sync pulses in phase with the rest of the field, i.e. switch heads before >the vertical sync pulse. Otherwise the interlace wouldn't work properly >(not that it ever does). Teletext was in widespread use well before the introduction of domestic VCR's - unless you count the old Philips 1500 ones (but they were mainly used by schools). By the start of VHS and Betamax there were many millions of teletext TV's in use in the UK - it was only the USA who didn't seem interested in Teletext. -- Nigel. /--------------------------------------------------------------\ | Nigel Goodwin | Internet : nigelg@lpilsley.demon.co.uk | | Lower Pilsley | Web Page : http://www.lpilsley.demon.co.uk | | Chesterfield | | | England | | \--------------------------------------------------------------/