Digitech Whammy I WH-1 ROM flashing

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Stevenrb718
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Post by Stevenrb718 »

I've been working on a WH-1 recently that didn't function yet seemed to have proper clocks and voltages. I don't have a schematic so I was doing what I could. I had another WH1 come in with separate issues, but the effect functioned after fixing. I took the opportunity to swap some ROMs to see if I could find the issue (I already previously swapped the big IC don't remember the label with no change). Swapping U22 brought the LED back, but no effect, then it seemed to freeze up. Also swapping U10 and U11 seemed to finally bring the pedal back to life. I think I found what these ICs are from blogs: N82S147AN and 27C64. They seem to be pricey, but my question is are they drop-in or do I have to write them? Would it be possible to pull the data from my working ICs and write to replacements? I only have one of those usb programmers that I've used for BIOS chips and a few 16 pin ICs. Any advice/info would be great.
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