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HP/Agilent 1675x logic analyzer card memory up-hack
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Hamster:
I used a SCA80 18gb SCSI drive when i had the 167xx frames and it greatly sped up the
artag:
The older 16555A and 16555D cards may also have memory size as a configuration option. Both appear to have the same size memory array (34 x M5416283-60).

However, there are no individual resistors around the Actel gate array on the top side of the board and few on the input side of the board. Comparing my 16555A with the pictures at  https://www.dropbox.com/sh/2rw2yf4dsdkx0zf/AABbXunP1vkF7xeaC5_B7lmua?dl=0&preview=16555D-A1.jpg I can see no differences.

The reverse of the  board does, however, have more including some in the most likely location around the Actel gate array. Unfortunately I don't have a 16555D and haven't found a picture of the back.

Could anyone with a 16555D post a picture of the back please - ideally a high resolution photo of the whole thing but at minium a shot of the area at the edge connector end, under the Actel device.
artag:
I wrote the above before I got my newly-acquired 16500C/16555A/16522A setup working. Now I have, I'm somewhat puzzled.

The LA board is clearly labelled 16555A 1MSa. But the mainframe identifies it as "2.0M Sample 110/500MHz LA" and shows 2MSa (/4MSa in half-channel mode). I guess it could have an ID fault and will turn out to have less memory thatn it appears but that seems unlikely. Or maybe it's a frankenstein card with the wrong rear panel. Or maybe it can be secretly enabled like those other cards and it's already been done. Or the start of adhesive corrosion I can see has unexpectedly done the same thing.

Any ideas ?


Further update :

I had some problems with that card that turned out to be a connector, so I was very unsure of whether it was working. However, it's now apparently working fine as a 16555D despite being labelled 16555A. So I assume it was modied either as a field upgrade or a hack. Howerver, I can't tell how. There is no evidence of different solder joints etc.

If anyone has a 16555A that reports as such, I'd be interested to compare (probably some details of resisters underneath) and you might be able to upgrade yours to a D by copying it.



Further further update:

I got some more 16555A cards and figured it out. There is a configuration resistor underneath the Actel FPGA (back of the PCB) which indicates whether it's a 555A or a 555D. It's fitted for the D card and not for the A and is one of a pair of 1.15k resistors so it's pretty easy to spot the empty pads if you have a 16555A.

HOWEVER it won't always work. I have one 16555A fitted with OKI M5416283 -60 256k x 16 bit VRAMs. This is sufficient for 2M memory depth and is the only one that has been upgraded to the D version successfully.

I have 3 other 16555A boards that  are fitted with Hitachi HM5316123BF-8 128k x 16 bit VRAMs. This is only enough for 1M depth and although fitting the resistor makes them identify as 555D they fail selftests on PLD and memory address tests.
One of my boards doesn't even have the link location (or at least, not in the same position - maybe it's elsewhere ) and although they all have the same FPGA (as does a 16557D) labelled 16555 there are some different revisions which may or may not matter. I'm not about to desolder 34 RAMs to find out.

I don't know when the change was made, probably towards the end of life when few A boards were being sold but if you have an A board you might get lucky and have one with the bigger vram chips.

RAQU_PL:

--- Quote from: Hamster on May 25, 2021, 01:52:03 pm ---With help from another forum member, here is how to fully enable a 16911A card.

To Enable 500Mhz Turbo: Change 0x000A to 0x01 , increment value @ 0x000C by the value added to 0x000A
To enable Max Sampling, Change 0x000B to 0x04 , increment value @ 0x000D by the value you incremented at 0x000B

For example on my two cards i did tests on: ( that i read the eeproms on )

0x00 0x02 0x16 0x20  [ stock 250mhz/16ms ]
0x01 0x04 0x17 0x24  [ fully enabled ]

--- End quote ---


Have anyone tried unlocking 16911a in 168xx frame?  Does anyone have 168xx frame with options other than 250 state 1Meg memory and is willing to read u90 eeprom?

Unfortunately Hamster's codes doesn't work. Behavior is that nothing changes but when trying to sample, the memory filling procedure hangs indefinitely.

My eeprom content 0x0A to 0x0D : 0x00 0x31 0x18 0x26  for 1Meg 250 MHz state.
danielbriggs:
I’ve liberated a 16910A in a 16902A frame.
Why software do the 168xx frames use? Do they use Agilent LPA?

There’s info on this forum to generate your own licenses to enable whichever options you require.
This is easier than dumping the EEPROM’s, but that’s also a valid technique.

I think on the 16910A’s it was U102.
I’ll have a root around for the EEPROM dumps if they’re of any use. I had two 16910A’s with a variety of configs. But I definitely upgraded one to the max mem and speed with enough perseverance.
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