Just when you think Casio has gotten something right, you learn they have done something dumb in the name of saving a few pennies.
I was on the Casio website reading the online manual for the Privia PX-830. Actually comparing the differences between the 800 & 830. On page E-37 of the PX-830 manual is a caution that causes one to shake to their head & moan "what were they thinking, or not".
It reads in part: MAGNETISM CAUTION.
AVOID PLACING CREDIT CARD, CASH CARD, PRE-PAID CARD OR ANY OTHER MAGNETIC CARD ON THE ILLUSTRATED LOCATIONS. (the caps are mine) The PX-830 has built-in magnets, in 4 different locations on the keyboard top that can damage cards which have a magnetic strip located any where on them. From the illustration, it appears that 2 of the magnets are used to hold the music rack down when the top/dust cover is open; plus 2 other magnets are used to hold the spacer in place than the top is closed. It seems the spacer must be used, because not using it could cause the top/dust cover to, as Casio says, "bow under its own weight".
So much for new, improved, etc. The Bean Counters win again.