Thanks, gentlemen, you've given me some hope, as I fear I may have fried my 26600 either by static discharge or by touching the +15V card riser rail against the keyboard PCB's (now I know to pull the keyboard toward the front before lowering the riser! Ugh..) . Even if I can find an original replacement (there's currently a 26700 on Ebay for $850!), or a donor CS-60, in the end it'll still be a fragile 40-year-old chip I'm throwing in there.
Old Crow's actually the tech that serviced this particular CS-80 back in '13. All new 4000-series IC's throughout.
Old Crow's actually the tech that serviced this particular CS-80 back in '13. All new 4000-series IC's throughout.