Not the most full of shit by any means, but Zakk has totally downplayed his Metaltronix rig from the NRFTW era. The most readily available "information" of his gear from the old Ozzy days says he used a pair of JCM800s from the get-go, even saying he used a Boss Super Chorus when that pedal didn't even exist yet!
Zakk's rig in the 80s was Metaltronix stacks, a giant rack loaded with Lee Jackson preamps and power amps, the SPX90, a Roland multi-FX, and the hidden Aural Exciter, with a pedalboard loaded with a MIDI foot controller (for channel switching), wah, and three Boss pedals: the SD-1, the PH-2 and the CE-3 (the last of which, outside of a rundown from Japanese magazine, you would never know he used).
In the 90s he switched to the dual Marshalls and trimmed down his rig significantly, but I bet the Exciter stayed in his rack for a long time.