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The flight software for both the FEP and BEP is stored on ROM. This non-volatile copy will be written in erasable electronically programmable ROMs to allow a permanent, radiation hard copy of the software to be rapidly loaded or reset through the boot process.
Total flight software will require 768 kB, 512 kB for the BEP and 128 kB for the FEPs. This software resides in EEPROM on each BEP. The EEPROM can not be changed via ground commands (i.e. it is not reprogrammable on-orbit). However, the software can be ``patched'', with patches residing in the spacecraft memory.