Turbo Calc 128 by Gregory R. Schmalhofer for the Commodore 128 (80 column mode) is a spreadsheet application from 1988.  Published by Softdisk, Turbo Calc appeared in volume 2, issue 3 of the UpTime disk magazine.  Full help is included in the program.

You can find a nice review of this software at the "I Still Adore My 64 & 128" website.