Monday, May 1, 2017

Decap #139 replacement: Mortal Kombat 4 U76

A bit back we processed PIC16C57 samples and discovered#139 (Invasion U76) was partially defective as received. We knew this before decap since PIC16C57 allows reading a 4 bit XOR of the 12 bit flash worlds even when protected. Unfortunately, only 2/4 word bits changed in the protected readout and only 3/12 word bits changed in the unprotected version.

Like Invasion, Mortal Kombat 4 is built on the Midway Zeus platform. With this in mind, a team member donated U76 from Mortal Kombat 4 to process as a replacement. Label off:

And here's it with the main EPROM masked against UV light:

Which allows safely erasing security fuses like in previous posts.

Stay tuned for our post on identifying and extracting #145 (Croupier)!

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  1. From an emulation standpoint, what does decapping and dumping this chip accomplish?

    1. It accomplishes more correct and better emulation.

  2. Great Job!
    this was really needed since a very long time.

  3. Have you checked this? Is the same protection?

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