(57) An electronic postage meter has an accounting unit with redundant nonvolatile random
access memories (20, 21) controlled by a microprocessor (10). The redundant random
access memories (20, 21) have separate groups of address (22, 24) and data lines (23,
25) to minimize identical errors in data stored therein. Data transfer may occur at
different times to and from the memories, with respect to any given byte of data.
The system may incorporate redundant microprocessors, and critical parameters may
be checked at periodic intervals in the main program of the accounting microprocessor
system.
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