Good question Beh. The manufacturer of the RT809H only just recently added a few older 28xxx eproms to its devices list. So the TL866 supported those and more already. And because the device list of the RT809H and its tasks are different to the other universal programmers you would need both for different tasks. (it mostly supports reading Nands and other memory chips from Laptops and CTV's, and is able to read the POST bootup of computer boards to check the tasks that are logged real-time to check where the hardware and firmware halts at failures. And the RT809 also is able to do quite a few more complex tasks that sadly are still very badly documented in mostly Chinese instructions that no English speaking RT809H owner understands. As also most of the special menu icons in its program are). Besides the fact that the TL866 protects chips for over-current in case they are inserted wrong or otherways they could be read wrong if pins make bad contacts and the TL866 will warn the user what pins are badly connected and halts. As also the Genius G540 universal programmer will do in such cases.

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I know exactly what you mean Robert. That is why I did the experiments with the Testclip cable connected to my TL866 (and my Genius 540) programmers. I hope that backing up both the U664 SRAM in my 2440 and the SRAM U2460 in my 2465A Tektronix scopes will be also possible. But I could fail when trying and lose those important values. If not I've at least managed to read the Calibration data of my 2465A scope manually by using the delta T and delta V front buttons together with the SLOPE button, by using the UP and DOWN buttons to select all address lines 00 to FF. Sadly the question that then remains is how to put those variables back in the SRAMs if needed. Because that option is not implemented and requires a complete re-calibration of our scopes if a 1 on 1 bit copy of the SRAM is not made available.

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