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I worked for National 1979-1990 and can confirm at least some of the problems were due to management’s unwillingness to spend money maintaining (much less improving) process and equipment. Jeremy

I have successfully written at least 6 boards - only one has the failure described.? I'm (reasonably) sure it is weak EEPROM. It will take me a bit to dig up my verson of Wayne's code, but I will

At LSSM we do repairs on TTL circuitry all the time. National Semiconductor SSI ICs have, by far, the highest failure rate of all manufacturers' ICs. I had (and still have) great respect for NS, but

I acquired one of these back circa 23 years ago. According to the knowledgeable seller it worked but had a bad time-base.? Ha! As some of you know, this engineering marvel has >100 SSI/MSI TTL ICs.?

I'm not sure if you're following up my note but yes, 10.08 is latest and its updater program can also optionally install the latest version of the OS. Don't have it in front of me right now, but the

Actually, the latest firmware for the E4406A is 10.08. Amazingly, it's still available for download on the Keysight web site. Stan

Terry Essentially there is a 1 Mb/s serial data bus that feeds the displays and printer port. I used a SXB processor (No longer available for some time) to decode the stream for the 7 segment display

Hi Paul, May I please clarify something in your post? You "added a RS-232 port" to your HP 5360A? Do you have any more details on that? I have the HP 5376A Programmer for the HP 5360A. Sadly the

John is right - checkout the Van Damme range, I've used several of their different cables as sensor leads - super flexible, very tough (built to survive roadies slinging things around on tour!) and a

FYI. "Spread Spectrum" options for PSU switching, and CPU clocks, is in effect a low cost "Bodge" to fool the EMC emissions test receivers when looking at an emission that is over the "Peak" detect

This is the EEPROMs on A13 board. It's a bit discomforting if you don't get writing to the Xicor x28256 to work properly. What I'm a bit curious of is how Wayne's code does the writing. In my current

I thought they weren't coax either but they are. I verified that with my 410Cs. I think they did that to keep down the noise on low value readings. Thanks, Barry - N4BUQ

I'm curious about this coax aspect if it's on the 3 leads - not the RF.? As far as I recall, those 3 are just single wires, no coaxial content.? DCA/DCV/OHMS/COM - all single wire.? Only the AC

HP P/N 1251-0135 NSN 5935-00-972-9464 90-6015-1207-00 95354 METHODE ELECTRONICS INC. DBA NETWORK BUSS PRODUCTS 90-6015-1500-00 95354 METHODE ELECTRONICS INC. DBA NETWORK BUSS PRODUCTS 91-6915-1500-00

Looks like I need to make a homebrew power supply, considering the cheapest replacement power supply is 250 dollars on eBay. Is the power supply frequency synchronization pin basically useless? The

Looking for a p/n 1251-0135 card edge connector in new or serviceable condition. Please contact me off-list if available: whitreeve@... Thanks -- Whitham D. Reeve Anchorage, Alaska USA ---

Try audio cable. Many musicians have gone to computer based mixers and have plenty to spare. Probably cheap on ebay also. It's super flexible.

Hello to the group. I have several operational 5360s and they are reliable. But when they break it can be a heck of a job to figure out. Thats because they truly were (I believe) the first computing

Thanks all,? my only interest is in the test leads, not the RF probe. I'll just focus on finding a suitably sized and flexible coax to fit, as it does not seem impedance is a concern here.? Was

The probe that comes with is? 11036A AC Probe (to measure AC from a few 10 of Hz to around 1 GHz?)... but with not very good accuracy at the low and at high end frequencies.... at the 'sweet' spot it