Products > Test Equipment
TDS-754C Renders Tektool floppy backup unreadable
amaschas:
--- Quote from: TERRA Operative on December 02, 2024, 05:21:50 am ---The cal data on these scopes is in two EEPROM chips on the acquisition board, so totally seperate to the firmware.
I would suggest dumping your current firmware and NVRAM via GPIB using the tektools app available somewhere on these forums as a backup, then upgrading the firmware.
That way you can always go back.
I've found it's pretty safe. The bootloader is seperate, so even if you get a bad write, you can always reflash.
I've even tried deliberately flashing the wrong firmware, and it was recoverable by going back to the original backup.
--- End quote ---
So this is the scope I've made a few threads about that doesn't respond to GPIB when the NVRAM is unlocked, so none of the tektool scripts that rely on GPIB work. Dumping via floppy was my only option unfortunately. Is there something else I would need to back up that I didn't get via this process? I thought the NVRAM backup was the firmware, and the EEPROM backup was the calibration data, but maybe I'm misunderstanding what those dumps are? Ultimately I'm hoping that by upgrading the firmware I can get GPIB working in unlocked, but I wanted to back everything up first.
TERRA Operative:
Aahhh, I forgot about the GPIB problems..
There are three things to backup. Firmware, NVRAM (enabled options and user settings mainly), and Calibration Data.
Firmware and NVRAM is on the processor board, and Calibration data is on the Acquisition board.
I don't think it's possible to move the firmware through the floppy drive as it is too big to fit on a disk IIRC, even Tektronix did firmware updates over GPIB.
amaschas:
--- Quote from: TERRA Operative on December 02, 2024, 06:07:09 am ---Aahhh, I forgot about the GPIB problems..
There are three things to backup. Firmware, NVRAM (enabled options and user settings mainly), and Calibration Data.
Firmware and NVRAM is on the processor board, and Calibration data is on the Acquisition board.
I don't think it's possible to move the firmware through the floppy drive as it is too big to fit on a disk IIRC, even Tektronix did firmware updates over GPIB.
--- End quote ---
Ah OK, so I'm likely OK with NVRAM and calibration data, but I'm guessing without GPIB I don't have a good way of dumping the firmware? Man this weird GPIB problem is a huge pain.
You know, now that I think about it, is there any reason the scope would need to be unlocked to read the firmware? Maybe I should give the tektool a shot with the scope locked?
TERRA Operative:
Yeah, I think from memory you can read the firmware out when the scope is locked, just not write with the switch in locked position.
May as well try anyway, the switch will prevent any damage being caused. :)
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