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Boosted by cstanhope@social.coop ("The Luddites were right"):
abrasive@digipres.club wrote:

The rumours are true; the Sega Saturn's System Manager and Peripheral Control (SMPC) chip is indeed a Hitachi HMCS400-series 4-bit micro!

The mainboard of a Sega Saturn. Diverse wires have been attached to one particular chip on the board. Some of them run to a doover which is plugged into both controller ports - labelled Professor Abrasive's Padulator - from which a USB cable disappears out of frame. A couple of the chip's legs have been lifted from the board.
A screenshot showing: - a bunch of Python that seems to be an SMPC emulator, - a terminal with some emulator output, - the Hitachi HMCS400 databook PDF, showing the Op-Code Map - the SMPC manual showing nothing in particular, and - a text file with some notes which don't make much sense on their own
A wider shot of the messy workbench. We now see laptop, soldering gear, bench power supply, oscilloscope, assorted hand tools... this is one messy desk user.