If eight pins is too much you could use a 4 bit interface.
Still much faster than any I2C or serial EEPROM, particularly when you
have to wait 10ms after a write cycle.
If you read a value and then update that value, you are supposed to wait 10ms right there.
No reason why the pic acting as a RAM chip couldn't perform other tasks until
it is interrupted,
as long as there's enough RAM left in both chips to run the program as well.
I'm sure I've asked about external RAM on this board before (or on the old picbasic list).
It would be nice to have a fast pic compatible RAM chip, as well as an FPU
(another thing I've asked about).
I'm sad that the pic32 chips don't even have an FPU (something I expected).
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