15 Mar
2007
15 Mar
'07
4:12 p.m.
And I don't know anybody trying to put a hard
drive in an analog TV. It
really serves no useful purpose.
\begin{tongue-in-cheek}
Try telling that to the guys at PPL (and elsewhere)
\end{tongue-in-cheek}
I will explain. At one time the action replays on (analogue) TV were
recored on a special analouge hard disk. It rotated at the video frame
(or maybe field) rate, and recorded the video signal as an FM encoded
analogue signal on a track of the hard disk (there wre quite a few
tracks, and a head per track). I think 3 separate tracks were used for a
colour signal.
PPL (one of the companies who made such device IIRC) sold a version of
this unit with a DAC and FM modulator on the input, and a DMA Unibus
interface to send data to the DAC. In that form it was a graphical output
device for a PDP11 (and thus, amazingly, this thread is back on-topic,
just...). I have one of the latter units, I've never set it up, but AFAIK
it should still work.
-tony