If you want more memory on an Atmega128 project, Scienceprog has a project for expanding the 4 kb internal memory up to 64kb using a 74HC573 to interface a standard memory chip.
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If you want more memory on an Atmega128 project, Scienceprog has a project for expanding the 4 kb internal memory up to 64kb using a 74HC573 to interface a standard memory chip.
There is also 18F8XXX PIC microcontrollers accept external RAM/ROM etc.
If parallel access isn’t needed, the spi SRAM from microchip is a much easier (to route) way to add 32kbytes of ram to a project with just 4 wires.
Check out the 23k256, I think.
I don’t know spi will be good for this. Basically you add the memory of the external RAM to the RAM of your own microcontroller so that you can use the extra memory for other stuff. The hardware inside does most of the job for you.
Of course SPI is easier to route the parallel interface. :D