Sideways Expansion
Acorn MOS supports up to 16 Sideways banks. Due to limited motherboard space, extra Sideways sockets were made available by third-party expansion boards. Certain boards, such as the Watford Electronics Sidewise board, also provided the option of permanent, battery backed-up RAM. This allows for developer testing of new Sideways ROM software without blowing an EPROM for each attempt. A write-protect switch could be used to prevent the contents of Sideways RAM from being modified.
Read more about this topic: Sideways Address Space
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