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Expanded memory was to use part of the remaining 384 KB, normally dedicated to communication with peripherals, for program memory as well. In order to fit potentially much more memory than the 384 KB of free address space would allow, a bankingscheme was devised, where only selected portions of the additional memory would be accessible at the same time. Originally, a single 64 KB window of memory was possible; later this was made more flexible. Applications had to be written in a specific way in order to access expanded memory.

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