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I appreciate all the input on the replacement.? Under the circumstances I am going to see if I can avoid replacing this part as I do not have the facilities, or the nerve, to fiddle with EPROMs.? My

Excellent teardown and photos! The service manual does list A1U19, the Executive microprocessor, as two items; the microprocessor and UVPROM, those have different part numbers. MK38P70/02D and

For the option 010 you might look at this item. https://www.ebay.com/itm/156837432635 Greg

Ed, I remember I found an Easter egg in the PROM of the 5334A (this is a picture from a few years ago):? you can see the name of the programmer in the ROM. Shalom Kattan, who later founded Carmel

I remember that in my 5334A, the PROM was stacked on the processor. It was nothing special, just a 27C64. I have the PROM dump, it will take a few days to find the file and upload it - please wait.

Jim, That is a truly fascinating bit of information, and thank you for sharing it. It makes sense that HP would eventually replace the microprocessor and UVPROM with a more cost effective mask ROM,

The microprocessor you have was primarily used as a development part. The PROM was in most of the Mostek microprocessors for one time mask programming. What you have allowed the developer to write the

Hi Dave just to confirm the HP 432B is a digital meter and this is what I am looking for The HP 432A is the analogue meter and I already have these Regards Paul Sent: 14 May 2025 15:55 To:

Joe, I'm not sure if HP changed this part out at some point. I popped the hood on my 5334A and found a microprocessor with a piggybacked ROM, both of which in place of A1U29, yet the service manual

A question on the HP E6380A - 8935 test set.? Does that test set allow you to test 1.2 GHz analog FM equipment?? The set mentions the range from 1.7 to 2.0 GHz and then 400 kHz to 1 GHz from what I

What is the replacement for part 1820-3639, IC-8-bit-4K ROM?? I am also seeking option 010, XTAL oscillator for this device. -- Joe White KW4YW

HP Group, FS, Keyboard, with logic assembly attached, removed from 8660C. Knobs, keys all intact. Was working when removed. $40.00 shipped to your door, US- L48. Gary WA2OMY

Hi Paul, I have a display I can send to you. Dave Smith - W6TE DXCONNECTION

This should help. Glenn -- ----------------------------------------------------------------------- Glenn Little ARRL Technical Specialist QCWA LM 28417 Amateur Callsign: WB4UIV wb4uiv@... AMSAT

Thank You chuck a job for the weekend as I am up to my neck in local council meetings and hospital visits Regards Paul

Hello, I recently purchased an HP3582A, and I'm encountering a problem with channel B. It's constantly in overload and always displays a saturated spectral line, even with nothing connected. Channel A

Can anyone tell me which circuit generates the intervals of the background noise? Thanks.

Advice from 35 years writing embedded code, unless you have a library of basic code you want to use, you should be using Python3 for new code. You can do so much more and do it easier than in Basic.

Hi , I need the service manual of the HP Logic Probe 10525H . Many thanks in advance . Best regards Maurizio IZ1MDJ in Turin

I would check the axially leaded capacitor that filters the 5V supply. It is likely bad, and will make the display black. -Chuck Harris <admin@...> wrote: