But now, you can get bandwidth out to 100s of GHz and memory depth unheard of a decade or so ago. ADCs got better with time, faster, stronger - not bionic, though! - and are at the heart of 90% of all DSO still made. None of that requires much vertical resolution, which was fortunate because at the time DSO were being born, analog-to-digital-converters (ADCs) were expensive to make. They were initially designed and optimised for looking at digital systems where wave forms were mostly square waves and strings of pulses. When I bought the Instek, it was about $560cdn and i looked at DSOs, as well. There was no way to accurately look at large waves or complex waves. A sine wave in the bottom 2cm of the display would look okay, but if you moved it upwards using the vertical position control, the top of the sine would distort, then flatten to zero a centimetre before the top of the screen. It worked for 18-months and then the vertical positioning went awry. I used a borrowed scope for a while, but it was old and temperamental, then bought a new GW Instek GOS-620 which is 20MHz 2-ch with a simple front panel. That was 1984 and it worked until about 2012 or so. My first one was a Philips 50MHz 2-ch that I bought new right from their warehouse for about $1500cdn. Being an analogue guy I've always had analogue oscilloscopes.
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