Curtis Steckel

@OneBitOnePixel I'd really appreciate it! curtis.steckel@gmail.com

@steckel I can send you a Python script to read the bytes in the correct order if you tell me where to send it.

The microcontroller from the Pocket Pikachu has been decapsulated. It turned out to be an 8-bit Mitsubishi M37520M5, with 20KB ROM, 512B RAM, and a 6502-compatible CPU core (like the NES/Famicom). Unfortunately, I can't read the ROM of this chip :( commons.wikimedia.org/wiki/File:Mits…

@OneBitOnePixel I think the readout order might be the most helpful. Could you describe the mapping from physical cell position in the ROM array to address and bit number? Even a high-level description would be enormously helpful.

@steckel The first step could only be partially automated due to the poor quality of the ROM photo, so it took a long time to manually find and fix errors. The readout order for this ROM was quite complex, so I had to partially analyze the mcu's circuitry.Which part are you interested in?

@OneBitOnePixel I'm finally trying to teach myself how to decode the image again. Mind telling me if you did this manually, with rompar or MaskRomTool? I didn't know about the latter two until recently.

@OneBitOnePixel I appreciate the reply. Reading your twitter account has been curiosity inspiring. Thank you!

@OneBitOnePixel I realize this is one year later, but I'm curious if your final results came from decoding the image or if you found a different method?

I tried Dash etching for the first time to make the state of bits visible and I got something! The etching turned out quite uneven, but not bad for the first attempt. Problem is, I haven't yet been able to extract a sequence of bytes from this mess of bits commons.wikimedia.org/wiki/File:PP_R…