In theory there should be no effects whatsoever, glass cockpit or steam-driven. The aeroplane is supposed to be so constructed that all it's relevant pieces are bonded together and the electricity (which is all that a lightning strike really is) is discharged to the atmosphere through a convenient static wick. That is what has occurred to me on the few occassions I've had one - just had a little marking on the paintwork.
However, sometimes the effects can be a little more spectacular than advertised, I assume because the bonding has broken down for whatever reason. There are many stories of a lightning strike on the nose which travels down the aisle as a fireball and exits out of the tail. In all the stories I've heard of this variety, there never seems to be much damage to the aeroplane (other than the brown marks on the seats
). There are also instances where the strike has caused partial, or complete, electrical failure, with all the attendant problems. A friend of mine had a case like this many years ago in an old Turbo Commander - he lost just about everything on the panel. Fortunately he was VFR and remained so until landing, so no great problem. I think those sort of occurences are rare though, thankfully.