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| Need Tektronix TDS220 firmware file |
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| chronos42:
I did it with a TDS220. I replaced the RAM with a 70nS 128k X 8 Renesas RAM and programmed the MM Firmware in a 27C040 from Atmel. It worked without any problems and makes this 21 years old scope attractive again. BTW: Without changing the RAM the TDS hangs in a bootloop with the MM firmware. @OH2LIY: maybe something is wrong with your RAM. |
| OH2LIY:
SRAM is probably ok, because TDS2CM (plain I/O software) runs on it (also using 29F040). If SRAM size is only difference between CM vs. MM software, I'll probably change it again to some different model... Ramppa, OH2LIY |
| JacquesBBB:
--- Quote from: chronos42 on January 05, 2018, 12:01:45 pm ---I did it with a TDS220. I replaced the RAM with a 70nS 128k X 8 Renesas RAM and programmed the MM Firmware in a 27C040 from Atmel. It worked without any problems and makes this 21 years old scope attractive again. --- End quote --- Interesting. What are the additional features with this change ? As I have not looked precisely to the board, I dont understand precisely the changes to be made. As you say, two chips need to be changed. Do you know their numbers on the board ? What are the original values of these chips ? Thanks |
| Nprod:
--- Quote from: JacquesBBB on January 06, 2018, 12:23:07 pm ---Interesting. What are the additional features with this change ? --- End quote --- You get an FFT option, that's the only difference compared to the TDS2CM. It's a nice upgrade because actual TDS2MM modules are hard to find and still very expensive. |
| chronos42:
You also get risetime and falltime measurment. And for me it was lot of fun to finally get these options for this old scope. I saved my TDS 220 from the junk, brought it back to life and I like it. I cannot explain why, but I really like this litte scope. I have much better scopes in my lab, but for repair jobs I mostly use the TDS 220. |
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