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The feature cartridge contains the
system software for the Modular 8X24 operation, including the call
processing, administration, and maintenance features and functions.
Post DR2 feature cartridges come in two parts for faster, easier and
less expensive upgrades:
- The Read Only Memory (ROM) section houses
system software and is easily replaced when upgrading.
- The Random Access Memory (RAM) section stores
customer data (features and functions you have access to) and
remains unchanged in case if upgrading software.
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