mon51 hardware part

any 1 have the schematic diagram of microcontroller...for mon51

i wan to ask that...even the microcontroller have internal ram/rom, it also require external ram/rom ?
it must hav:
1 external ram (store program)
1 eeprom (for mon51 program)
1 microcontroller
1 latch
max232 and rs232 ...?

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