I'm incredibly pleased to announce that the microcode for the Intel 80386 has been decoded.
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I think this image deserves a tiny bit of explanation. What are we looking at here?
Well, it's a direct mapping of the microcode array to a bitmap, where black (0) is no transistor and white (1) is a transistor.
Overlaid on the actual microcode die photo mosaic, it looks like this.
Each microcode word on the 386 is 37 bits long. So each of these rows of microcode bits contributes one bit to the resulting microcode word.
A PLA activates the columns of the microcode ROM from above, column-wise, and from the left side, via multiplexers, ultimately activating exactly 37 cell positions for each microcode address.
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@infosecdj @gloriouscow spiked HCl?
I don't do much semiconductor processing but I can give that a go; we're not allowed to bring any solvent to the acid bench so if you have any dies free of epoxy (but not necessarily delayered) that would be ideal
@ldcd @gloriouscow Ah, adding some H2O2 to HCl speeds things up by a lot. Also makes it fume chlorine, so a fume hood is recommended for obvious reasons.
@gloriouscow do you think you could supply some? Both of you are likely on the same continent, no? Otherwise I can do it.
