First computer with real-time clock?

From: William Donzelli <>
Date: Mon Aug 9 21:21:35 2004

> > No, the streams were just digitized radar video.
> Yeah, no kidding!

What I mean is that there is no time stamping, no complex format, no
handshaking - just a bunch of bits.

> * the CRTs deflection yoke mechanically rotated in sync with the radar
> dish via Selsyns & servos;

By the 1950s, the rotating yoke was mostly out of fashion, save a few
World War 2 designs that refused to die. Even some World War 2 PPI scopes
did away with them, doing the rotation electronically (SCR-584, for one).

> * map overlays, if any, were either transparencies applied to the CRT
> face, or electronic ones were a lucite mask over another CRT, complete
> with rotating yoke in sync with the main display, and a phototube that
> picked up the "map" outline on the lucite, and summed the "map" voltage
> in with the radar analog data;

This is how the SAGE AN/FSA-10 gap-fillers worked - the scopes of up to
six radars were directed at one radially scanned image tube. The result
was a composite radar video stream.

William Donzelli
Received on Mon Aug 09 2004 - 21:21:35 BST

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