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Sniffing the Rigol's internal I2C bus

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staze:
Yes, I has been tested. Yes, they're 300Mhz (if only barely (like, 315Mhz)). Check a few pages back. :)

A Hellene:

--- Quote ---I find it hard to believe that firmware/software alone can turn an $800 device into one costing nearly triple.
--- End quote ---
Well, it is a marketing trick, euphemistically called 'scalability' where by changing the product key only, we can have multiple levels of functionality (and cost, of course) from the same product, like the Windows 7 Ultimate/Enterprise/Professional/Home/Starter installations. But, this is more like designing a 6-core i7 CPU and selling the bad i7 chips (with a defective core, for example) as 4-core i7 CPUs after disabling two cores, or as proud 2-core i3 CPUs the even more crippled ones instead of recycling the bad dies...

For example, we design a 300 MHz device using cheap components (to maximise our profits) and by testing each one of these the best performers are labeled 300 MHz units, while the ones that perform up to 200 MHz are labeled 200 MHz units, and so on. Read this message to understand how it works.


-George

staze:
Indeed. Or, you can design to 300Mhz, skip that testing and assume that most users won't hack their devices, and still turn a profit quite easily. The BOM for the 2072 still turns a profit, even more so if people buy the higher versions, or options. Like you say, much like Windows, or Office versions. Heck, AMD and Intel have done this too with chips... Remember the "jumpers" on the CPU substrate? Overclocking was so easy back then. Or just disabling a core or two via software. :/

Given the tests most have done so far, it seems like Rigol are probably skipping that assessment. Just QA, serialize, label, ship. This is much cheaper than doing assessment, and you still turn a profit. The front end filters would seem to indicate that. But, unless someone has a 2072 hacked AND a "real" 2302/2202, it seems unlikely we'll be able to confirm either. :/

JDubU:
Another well known example was the multi-million dollar General Electric 600 series mainframe computers in the 1960's.  There were different models, with a significant spread in performance and cost.  The only difference between three of the models was the position of some wire wrapped jumpers on the backplane.

http://en.wikipedia.org/wiki/GE-600_series

"... The 600 line consisted of six models: the 605, 615, 625, 635, 645, and 655.
The 615 was a 635 with Control Unit (CU) and Operations Unit (OU) overlap disabled, and a 36 bit wide memory path. The 625 was a 635 with Control Unit and Operations Unit overlap disabled and 72 bit wide memory path. The 635 had a 72-bit wide memory path and CU/OU overlap enabled. The difference between these models was less than 10 wires on the backplane. Field service could convert a 615 to a 635 or 625 or vice versa in a couple of hours if necessary;other than those few wires, the 615, 625 and 635 were identical. The 605 was used in some realtime/military applications, and was essentially a 615 without the floating point hardware. Programs coded for a 605 would run without any modification on any other 600 line processor"

apelly:

--- Quote from: Carrington on December 21, 2013, 07:45:26 pm ---
--- Quote from: apelly on December 20, 2013, 10:30:23 pm ---
--- Quote from: Carrington on December 16, 2013, 02:43:24 pm ---Someone can take a better picture of the DS2xxxA's input stage?    Apelly for example.

--- End quote ---
Busy, but I'll take a look in the next 48 hrs.

--- End quote ---
Ok, perfect, if you can take pictures of the rest, jumpers, DC / DC ...
Thanks.  :-+

--- End quote ---
No susprises.

These will have to do for now... The 'scpoe's still open, so can take more, but even a linux buff like me needed to look up a quick way to resize pics.

Just let me know what you want to see.

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