The original Apple 2 from 1977 had an integer basic ROM set on the
motherboard. Apple came out with an Applesoft (floating point) rom set
that they put on a card (with switch to toggle between integer and
floating point (switching the switch with power off)). Most users used
floating point more than integer so they swapped the ROMs from the
motherboard (the integer basic ones) to the card and vice versa. The
(marginal) benifit of this card now days is you don't need to load the
integer basic routines into RAM on top of the DOS. I understand that
this card was used by a number of "crackers" for causing an NMI when
switched with power on, so they could drop to machine language and
tinker with the code to bypass/remove copy protection on certain
programs/floppies.
Just my few cents...
JW
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