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HP/Agilent 1675x logic analyzer card memory up-hack

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DocBen:
the 16960As have a similar feature it seems. There is a field of resistor rows above the main ASIC.

And it is suspiciously different for 4M and 16M cards ;)

Now I only have to unbrick the three I have. Maybe I'll get to that this weekend, maybe next.

Does anybody have the (native) 100M version of the card?
I think there is different resistor value on there. Mine are all blu, dont know the value yet, but on pictures the first resistor of the second row looks different on the 100M card. But maybe thats just the pictures I saw on ebay.

CatCow:
Glad I saw this thread today... I was working on my 16903A/16910A this morning, after finally obtaining some parts as an experimental repair. Got a good deal on it from eBay, has two 16910A cards - 250MHz state, 256k memory on one and 4M memory on the other. The 4M card had a large number of memory errors. It may not be the memory, but I decided to try replacing those chips - my first attempt at SMT rework. Well there are also clock errors, and now after the "repair" another memory chip is throwing errors.

I noticed that there is a similar pad of jumpers for the board ID to the older models... Two rows of six small blue SMT jumpers. I didn't remove one to measure, got about 4.2k ohms across an installed one. As seen in the attached photo, the 4M 250MHz card has all jumpers in place except B6. I didn't take a photo of the 256k, but it had all jumpers except B5. Given the failed attempt at repair and other more difficult to diagnose/repair problems on the board, I will probably attempt to play with the jumper locations and see what happens. If it works out well, maybe it will be worth trying to hunt down the clock error...

gslick:
One thing that is different about the 16910A module is that it can be upgraded in the field by the customer by installing a software license. Possibly the licensed sample depth / state speed configuration is stored in the serial eeprom along with the serial number.

If you were adventurous and have multiple 16910A modules to experiment with maybe you could try removing and reading the serial eeproms to compare the contents between multiple modules. Maybe there would be obvious differences for the module serial numbers, any maybe some not quite as obvious differences for licensed sample depth / state speed configuration option differences.

CatCow:
Well the 16910A looks to be more controlled by software than hardware as you suspected. I did manage to break it enough to say that it was an invalid board(and an FPGA error message that wasn't showing up otherwise), but anything that worked was not recognized as a different spec module. I may spend some time tracing the clock signals and see if there is anything to be done there for trying to make the board operational, otherwise I see a lot of clock fanout chips that may find their way into a GPSDO project(would be just my luck if that was the bad part). Bridging all the pads has brought it back to a point where it will be recognized, but unless I find a cheap board on eBay to go in it, I'll probably just use the single working board. Not exactly limiting for what I might use it for.

perdrix:
Did anyone who has both 16717A and 16719A boards ever find the time to compare to see it the 16717A can be upgraded too (I'm up for upgrading the ROM ICs if I can find suitable ones).

If necessary I can pull a 16717A from the analyzer and take pix. 

Or are the 16718A/19A different beasties altogether?

Thanks
Dave

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