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Jun 24, 2020 at 8:16 comment added AndreKR It was also shown in the morning before the broadcast, which is essentially what YouTube does here, albeit for a different purpose.
Jun 23, 2020 at 6:41 history edited Glorfindel CC BY-SA 4.0
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Jun 22, 2020 at 21:25 comment added vhu Digital? Meh, that was the analog era. Time of great adventure, sense of achievement: it was not given that the image was aligned correctly. To tune the channel correctly so that you had both color AND static-free stereo audio was rite of passage.
Jun 22, 2020 at 6:51 comment added Mast "it was typically shown when the regular broadcast ended" Yes, or during broadcasting problems. Instead of putting the channel on black, they'd put in this test card. Often with a message indicating to be patient or that there was a technical malfunction (those black bars at top, middle and bottom doubled as text background).
Jun 21, 2020 at 23:18 vote accept thesilican
Jun 21, 2020 at 20:00 history answered greenforest CC BY-SA 4.0