Sideways Address Space
The "Sideways" address space on the Acorn BBC Microcomputer and Master-series microcomputer was Acorn's bank switching implementation, providing for permanent system expansion in the days before hard disk drives or even floppy disk drives were commonplace. Filing systems, application and utility software and drivers were made available as Sideways ROMs, and extra RAM could be fitted via the Sideways address space.
The Advanced User Guide to the BBC Micro only refers to the Sideways address space as "Paged ROMs" because it predated the use of this address space for RAM expansion. The BBC B+, B+ 128 and BBC Master all featured Sideways RAM as standard.
Read more about Sideways Address Space: Sideways Address Space, Sideways RAM, Sideways Expansion, Sideways Model
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—William Shakespeare (1564–1616)