As far as I know after some weeks torn from the internet, the standby horizon was unaffected by the computer derived errors. Although the main systems were probably okay, the idea of the standby is that its power supply should be maintained and its internal workings unaffected by the plethora of information inputs. If in doubt, check that little unit.
Just a video of a random 330. Start just after a minute in. Worth looking at the scan of first the standby horizon, then captain's screen, then it goes through standby to the right. A bank has been started.
Even the standby is electronic. I would love to see a gyro in there somewhere.
Probably a translation plus press-speak, but some of the dialog must be from the transcripts. Totally horrifying.
Cockpit terror of jet's 38,000ft death plunge - News, Frontpage - Herald.ie