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My programmer verifies the same way. Never got a FW checksum error,? always a non-recoverable fw error. I'll check for bent pins.

Swapping the -120 for a -150 is certainly something I can try. The signaling eprom is the latest I believe 08920-87167 from the HP/Agilent groups io file section

Re: [HP8920/8935 Family] HP 8920A Firmware Upgrade Issue Hello, Wednesday, May 10, 2023, 17:11:31, wgwl wrote: Actually one of the new firmware eproms is a -120 (faster), but I don't think that should

normally the verify process on your programmer should catch that.? The one I usually use does three passes at varying voltages? ...from 4.75 to 5.25 The 8920A had the slower processor so it would be

Actually one of the new firmware eproms is a -120 (faster), but I don't think that should matter. The current FW 9.15 (original HP parts) runs fine and is a mix of AM27C040, TMS27C040 and TCS574000.

The original factory firmware (rev. 6.11) eproms are Toshiba TC574000D-150. I used the same part number eprom to program the newer firmware so that shouldn't be the issue. Thanks for the suggestion,

Just couple of things to check is if you can is to try another brand of eproms and also the speed of the eprom. I’ve failures in equipment if another brand other than the original eprom is used or a

You are probably correct in that the processor board is the issue.? ?The new firmware is hitting? something unused on early versions that is broken. I have never seen a firmware compatibility issue

Sounds irritating. Possibly the eeprom on the controller board is corrupt?

Update... First off, thanks Rick for those files. They match the files that I used to program the eproms. I removed the hardware down to the CPU, memory and CRT controller as suggested (but forgot to

Sure, ?? Here attached are the 14.14 files from a chipmax programmer (6 total) Rick

Hi, Rick. Could you email me the A.14.14 firmware files??Thanks,GregSent from my Galaxy

Will do. Thank you!

Hi Casey, I have all that hardware. If you contact rick at amtronix instruments (lab4@...)? - I can ship the hardware to you. ? rick

I recently re-acquired my old HP8924C from a friend's estate who passed a couple of years ago. When I found it the device would not power on and all the outer case and inner power supply case screws

Hello to all, If anyone is interested I am selling my CRT display that was just removed from my 8920B a couple weeks ago. It has a crisp, clean display with no issues at all. No excessive screen burn.

Long story short... I think that you got it right. I swapped some stuff around including a firmware board with the extra memory and everything is working now. Thanks so much for the help!!

This looks terrific. Is there a link showing how to do this? Thanks Dave KA6BFB

Looks great! Steve Flory W9KOP sflory@... "I like climbing towers because people look up to me"

Hello to the group, I know the LCD conversion is nothing new for the 892x series. I recently, thanks to member "DCFluX" mentioning this, added external VGA out the back of my 8920B. I wanted to share