My computer setup in 1984

Or perhaps 1985. I moved from Houston, Texas to a tiny town in East Texas in 1984. This VHS framegrab is from a “music video” I made back then. Ah, fun times.

MTV never played my music video. :-(

One thought on “My computer setup in 1984

  1. MiaM

    Interesting that there is a h-sync-whatnot issue mid picture.
    In general when capturing or displaying video tapes on any device not set up for video tapes in particular you tend to get that issue but for the top part of the picture. (I don’t know if it has a particular name, I call it “blowing” as it’s like if the wind is blowing hard pushing the picture sideways at the top).

    (Infodump: The reason for this is that since all video tape recorders (afaik every format) has a rotating drum, almost always using two heads that the electronics switch between during the vertical blanking/sync period, any imperfections in the mechanism, in particular when not playing back on the same device that did the recording, each field/frame/whatnot isn’t perfectly aligned horizontally to the preceding field/frame/whatnot. Thus the device receiving the video signal needs to be able to sync up to the horizontal sync faster than needed for a “perfect” signal from say a video camera, broadcast station, 80’s home computer or more or less any other device that outputs video without using mechanical moving parts.
    The downsides of using a video tape ready TV/whatnot is that it’s also less resilient to noise, making a noisy signal “shake” sideways in a way that it wouldn’t if the synchronization were slower. Also for CRT TVs the whine from the horizontal / high voltage transformer tends to be even more painful when the sync circuit is set up to work with video tape playback, as the 15kHz whine gets modulated with sharp edge pulses during each vertical sync period. I think this creates subharmonics of the 15kHz whine, which makes it even more painful.
    Btw the 15kHz whine and how awful it actually is, especially when sitting close to a CRT TV/monitor, really shows how much people loved their computers in the 80’s as they found it worthwhile to go through that painfully awful sound just to be able to use their computers. Also: A clear sign that those in charge of consumer electronics magazines back in the days were older buffs is that they afaik never ever measured the loudness and frequency spectrum of the 15kHz whine when testing TVs/monitors).

    Reply

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.