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DrZarkov wrote:For 32 lines it should be much simplier und could me more fun than just a normal testcard on the screen.
Roland wrote:DrZarkov wrote:For 32 lines it should be much simplier und could me more fun than just a normal testcard on the screen.
It sort of had crossed my mind too.
Another application might be an oscilloscope. True the Nipkow disk is not ideal for this (as it doesn't have a beam which is controllable like a CRT) but it must be possible - in much the same way that computer based oscilloscopes don't manipulate the CRT beam - instead the generate a video signal which is displayed like any other picture.
I also wondered if a mirror drum could be used a scan a light beam across a screen. The vertical deflection would be caused by bouncing the light beam off a mirror attached to a loudspeaker fed by an appropriate signal.
I seem to remember in a 1970s issue of Byte magazine a design for a 'Scramble' arcade game using a 2 beam oscilloscope and a 6809? cpu. Maybe a mechanically scanned version of this is possible too?
Roland.
This is a very sensible approach for a non-CRT based oscilloscope. Actually, CRTs of the high-vacuum type were expensive, unreliable and short-lived well into the 1930s and therefore were generally eschewed. Furthermore, the high-tension power supplies to drive them were also very costly. Gas-filled CRTs of the cold cathode "Braun" type were better and did not have the high-tension drive requirements of high-vacuum types, but they were incapable of z-axis beam modulation. In fact, Karl Braun demonstrated the first cathode ray oscilloscope with such a tube in 1897.Roland wrote:[quote=Another application might be an oscilloscope. True the Nipkow disk is not ideal for this (as it doesn't have a beam which is controllable like a CRT) but it must be possible - in much the same way that computer based oscilloscopes don't manipulate the CRT beam - instead the generate a video signal which is displayed like any other picture.
I also wondered if a mirror drum could be used a scan a light beam across a screen. The vertical deflection would be caused by bouncing the light beam off a mirror attached to a loudspeaker fed by an appropriate signal.
Roland wrote:I really should go and buy a CRT oscilloscope - as I'm sure anything I buy will be considerable better than anything I can build
Roland.
AncientBrit wrote:I found that the biggest problem building your own scope was getting the input attenuator to have a flat response.
Graham
AncientBrit wrote:Steve,
5CP1 ?
I'm old enough to remember VCR97 and VCR517 tubes!!
Graham
DrZarkov wrote:Thanks to Klaas there is a testcard-generator for NBTV. I wonder if it would be very dificult to create a simple video-game for NBTV-monitors, I thought about "Pong" (for the UK "Ping") or a game like that. The original "Pong" was created in the sixties using tubes, the first commercial Pong from 1972 (the Magnavox Odyssey) used only 36 transistors and no ICs! For 32 lines it should be much simplier und could me more fun than just a normal testcard on the screen.
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