Nice find in the service manual!
I wonder what "Hedwig" is on the acquisition board? An internal code name for a custom chip?
Dave.
As it stands in the schematic, looks like it might be the mem controller, some serious Harry Potter(HP, he-he-he) fans there
![Cheesy :D](https://www.eevblog.com/forum/Smileys/default/xcheesy.gif.pagespeed.ic.KPzuH4J-TG.png)
Monkeh, hmm letsee, we have 4 wires down each SATA cable and a x1 link needs... 2 pairs for data, one pair for clock, yup, there it is, the two cables i had forgotten completely about clock pair.
there's not enough pairs left for anything else(highly doubt the're running the i2c pair, probably ground for spacing)