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My ST NVRAM came today. As previously reported it took 3 boots to clear the T1331 error. I now have both the 11810 User Manual and Service Manual in original Tek hardcopy. I experienced a good

How well I know. My last job in the hybrid business was at Teledyne Microelectronics. Space Qual parts had reams of paperwork, x-rays, PIND test,photographs, etc... Tek, Keysight, and many other still

Photos are at https://vintagetek.org/photo-of-the-month/ =============================================================== I used to work for/with Jim on the T4002 in Building 50. His amateur radio

Once a month I post a unique or humorous photo we run across at the museum. This is only the third month so there are only three so far. This month's is kind of unique. We ran across the picture but

Not in the space industry. Hermetically sealed thin film hybrids are still the only way frequently. Not cheap for space qualified parts though ;-) Craig

Despite having removed all power from the D432656 SRAM to get it to function, it still remembered all of that information, so it is stored in multiple locations. My replacement NVRAM came today, so I

Bob, I think you are right, According to Tektronix_11801_Factory_Diagnosis_Manual,page 2, about "Clearing NVRAM:": the NVRAM is initialized by filling all but a few locations with default value. the

I rather feared that was the case. So "For parts" units are a significant gamble. I was very lucky that the two SD-22s I got for $150 delivered both turned out to be good. That seller mostly dealt

These are thin film hybrid microcircuit assemblies. Easy enough to repair IF you have a well equipped hybrid lab and access to the right chips. Figuring out the correct parts, and then finding the

I have been following this thread with some interest, as I have a 11801A that had dead TB NVRAM, and a 11801B with all (still) good OEM NVRAM and batteries. I don't think there are factory only cal

The data sheet for the D43256 gives a 2 V minimum data retention voltage. I suspect Tek set the error level higher to give the user a chance to replace the battery before they lost data. The big

For sale is my copy of this book, purchased directly from the Tek Museum. It's an interesting read, giving a lot of insight into what it takes to start up a company, and Mr. Tippery is an excellent

Hi, I believe some of the Dallas NVRAM chips have features to query the battery status. It works by accessing specific memory addresses in specific sequence, so it works purely in software, needs no

OK, thanks! Mike Dinolfo

If my memory doesn't fail me: battery error code T1331: the path for it is: subsys--------------block------------area------------routine Timebase -----TBC control------ Static RAM-----Battery this

Things are generally a bit disorganized in the archive. Once I have my replacement NVRAM I'll set about archiving all my ROMs. And writing up a description of the repair process. The only thing I

Yes. After I reset the jumpers on the IO board to the default locations it stops with a T1331. I just verified it to make sure there was no transposition of digits. So somehow it is able to tell

Very nice Reg, and very clever of Tom (that is, I didn't think of it!). There is nothing special in the PCB. The 11801 can't know that there is a Dallas construction plugged in except for loss of

Hi: CRC 5.56 aerosol. It a highly refined mineral oil, dissolved in naphtha, with liquified (due to the pressure in the can) petroleum gases, that act as the propellant. There is some supposed

Yeah, I was referring to the ROM images not manuals. Bob.