Eric Christopherson <echrist...@gmail.com
> 1. Is the EEPROM used to save things with XW the same chip as the one used
> for the new EEPROM FS?
Yes, but both write to different parts of the chip, so they do not
affect each other.
> 2. How many writes can the EEPROM(s) sustain? I'm not sure if they're
> garden-variety flash or something else.
The data sheet guarantees 100000 write/erase cycles, in practice it is
likely that you get more than that. For example someone who tested the
endurance of the EEPROM on an ATmega328 found that it took more than 1.2
million cycles before the first cell gave up. His code wrote and
verified at maximum speed and needed 47 days for that, the accesses from
a C64 shoubd be much slower than that.
So unless you plan to use the EEPROM FS as storage for a C64-based data
looger that you plan to run for many months or years you probably do not
need to worry about the number of write cycles.