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It is interesting to note that MOSTEK NVRAM has "PRE-QUAL" marking. Unless it means something else during that time, this looks like pre-production unit. It is common to give engineering samples to

The following photos have been uploaded to the Tek 575 ( /g/TekScopes/album?id=262383 ) album of the [email protected] group. * 20210301_201121.jpg (

Roger Evnas wrote: I think it's just the discrete logic. There are two ripple counters, one on the front side (74HC390) and one on the back side (74HC4040) that I think are used to generate memory

FWIW, TTWIMC: This topic, and other conversations relating to closed loop/feedback always take my mind back to the "Control Systems" class I took in school. Taught by Dr. Richard Dorf at UC Davis,

Well, I hope no one tries to tell me that the Wright brothers didn't invent the airplane! ;-) Thanks, Barry - N4BUQ

There's all sorts of things problematic with that statement; but, there is... I would claim... a core of truth to it. One consequence is that it takes more than an opinion... or more than an opinion

I should mention that a clue to the timing and model line is the handle. That big fat ugly plastic handle on the lower end models provided a significant cost saving over the "classic" stainless steel

The 2201 appears to be fairly close to this scope being discussed. Looks like several lower end analog/DSO models were developed. These would have appeared sometime after the 2230/2220 intro in 1985.

The newest date code I could spot was 1985, the Ferranti ZN433 ADC was originally a 1MHz part but this ZN433CJ-10 might be faster. There is a 200nsec 2k x 8 NVRAM and no CPU visible on this board -

Looking at the photographs of the boards it is apparent that this was a serious effort, not a hack job. The date codes on the IC's are all generally from 1984 -1985, so that is period correct. The

Hi, I agree with Ed, looks like a prototype or maybe a custom model for a customer. Could this be the only one of its type? Does the storage board look similar to any other 22xx boards? Maurizio,

Thank you guys, you give me back hope. I'll try with the 7470.exe. --Cheers Attilio

I uploaded few pictures of

Ed, From the posted picture, this unit appears to have a serial number (20?25?). Would a prototype get a serial number? -- Jeff Dutky

It may be a prototype of a DSO version, like the 2230 family. If so, it would likely have been developed in Hoddesdon, UK, circa 1989. If it became an official product, it would have had a whole new

Maurizio, I was not able to find any reference to a "2215A storage" scope, or a storage option for the 2215A, in the Tek catalogs between 1985 (the first year that the 2215A was offered) and 1986 (the

Yep, I saw the pictures, but I am not buying it. Tektronix catalogs don't show a 2215A with memory. Not 1985, nor 1986, which were the only two years the 2215A appeared in the catalogs. I am pretty

You are absolutely right! Blumlein is an insufficiently-sung hero, so thank you very much for correcting my lyrics! -- Cheers, Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way

Sadly I got no further - and without a CLIP I think there's little hope. I know that a CLIP for the THS7xxA handhelds is out there, but AFAICT nothing of that sort exists for the TDS3000 series. David

One minor correction: Blumlein's cathode-follower patent is dated 1934, when he was working on television. EJP