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Bank switching can be considered as a way of extending the address space of processor instructions with some register. Examples: The follow-on system [3] to a processor with a 12 bit address has a 15 bit address bus, but there is no way to directly specify the high three bits on the address bus. Internal bank registers can be used to provide ...
English: A hypothetical bank switching memory map showing how a processor that can only address 64 kB could have 200 kB of memory connected. In this hypothetical system, the processor would start with Bank 0 only active, then would switch between banks 0, 1, 2 and 3 depending on the needs of the operating system or users.
The memory arbitrator could bank switch the second 128 KiB bank on the card to other banks, allowing the XT Intel 8088 processor to address all the RAM on the 370PC-M card. [4] Besides the 416 kB of usable RAM for S/370 applications, the XT/370 also supported up to 4 MB of virtual memory using the hard drive as its paging device. [5]
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