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| free_electron:
hmm. whats under the flatcable ? you are looking for a 4 pin or 14 pin device 93cxx series , most likely national semi |
| gamalot:
--- Quote from: free_electron on August 01, 2022, 01:01:29 am ---hmm. whats under the flatcable ? you are looking for a 4 pin or 14 pin device 93cxx series , most likely national semi --- End quote --- Full of 78L/79L regulators in SOP8 package. :-DD --- I've double checked and didn't find any EEPROM chips, at least not on the top side of the PCB. |
| Hugoneus:
--- Quote from: free_electron on August 01, 2022, 01:01:29 am ---hmm. whats under the flatcable ? you are looking for a 4 pin or 14 pin device 93cxx series , most likely national semi --- End quote --- No luck. The configuration is likely in the Flash memories. |
| Hugoneus:
--- Quote from: picburner on August 01, 2022, 12:36:44 am ---I have read the service manual and it says that the calibration/configuration data are stored in the flash memory. So there are no other memories to look for. The temporary data is stored in the two SRAMs, probably powered by the Supercap near the 10MHz TXCO. The code that allows you to update the firmware (instrument side) is found in the BootRom AM27C1024. This code takes care of loading the firmware into RAM via GPIB (I suppose in more steps since the ram is smaller than the Flash), erase the flash and rewrite it. One could study the code contained in the BootRom to write a Python program that does this job on modern computer. Always reading the manual, I read that the original program only runs on the VEE 3.21 version, therefore an additional complication. If you want to read the contents of the Flash memories without unsoldering them, you could try to keep the cpu in reset state and read the memories connecting to the data/address buses as long as the hardware configuration allows it (CS/WR/OE signals should also go IDLE). --- End quote --- I think I should be able to read the flash memory directly... But I like the path of trying to find the commands for upgrading the unit through GPIB itself. But even then, the actual code would need to be discovered which is a function of the serial number... |
| Aiy:
For the options, what about those small switches at the top and bottom of your picture? You could check where they connect to and try the different positions, only 256 combinations to do :-DD Best regards |
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