Yamaha CP-80

The Yamaha CP-80 was an acoustic/electric grand piano launched in the mid-1970s. It is the bigger version of the Yamaha CP-70, with 88 keys instead of 73, and an extra octave.

Peter Gabriel's Yamaha CP-80
The Yamaha CP-80 was Peter Gabriel's main piano, after the Yamaha CP-70.

He used one for at least part of the So album. In this photo taken later on during the So sessions, a Yamaha CP80 can be seen (with the extra octave of keys), while photos from earlier on in the sessions show a CP-70. Both Yamaha CP's were mentioned in a report published in Musician magazine, July 1986 issue.

By the time of the So tour, Peter had completely changed over to using the CP-80. He continued to use the CP-80 on the Passion soundtrack and the Us album. He also played the CP-80 on Joni Mitchell's "Beat Of Black Wings", released on Chalk Mark in a Rain Storm in 1988.

Note
In the photo linked to here, there are three black keys visible (F#, G# and A# - the latter key slighly concealed by a Boss pedal) instead of two black keys on the Yamaha CP-70 (C# and D#). Thus implying that the Yamaha piano in the photo is specifically a CP-80 model, rather a CP-70.