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c51 mon51 problem at89s8252

i hav some problem relate to the MON51,
my microcontroller is at89s8252
i using the max232, and rs232 serial port
and a eeprom for MON51 program.

atmel AT89S8252 got internal ram 256 byte
i wan ask that the MON51 require 256 bytes von Neumann memory for the MON51 data area.
can i use the internal ram 256 byte? or i need to get a external ram, for mon51 data area?

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