Is the AT90* line supported by the Arduino IDE? Is it compatible with ATMega-based code?
Looking at the spec sheets, I noticed that the AT90USB1287 tops out at 128kb of flash memory. The ATMega2560 has 256kb. I know that some people's electronics may have enough pins for everything that they need to control, but they don't have enough memory to hold the program to run it all and have to sacrifice some to get it to fit.
Looking at the spec sheets, I noticed that the AT90USB1287 tops out at 128kb of flash memory. The ATMega2560 has 256kb. I know that some people's electronics may have enough pins for everything that they need to control, but they don't have enough memory to hold the program to run it all and have to sacrifice some to get it to fit.