Thanks to Dave Shaffer, I'm now an owner of the new 20b :-).
After some successful surgery (gluing the bottom of the LCD to the faceplate to make the top row keys not sticking anymore), I was ready to explore it. Besides the excellent display, finding the ABS function in the math menu came very much as a surprise. Has a macro functionality, as indicated by some erroneous entries in the manual, originally been considered for the 20b? What else could be the reason to have the ABS function available?
Does anyone know if a new firmware is planned to support macros?
Thomas