Storing Screen Images; Choose Your Screen; Hardware Bank Switching - AMSTRAD cpc 6128 User Instruction

Part 1: Storing screen images
Choose your screen ....
The BANK MANAGER is able to switch out Block 1, and switch in one of the four
blocks from the second 64K in its place. The diagram below illustrates this action.
Note how each of the blocks from the second 64K occupies the same address space
(&4000 to &7FFF). The contents of Block 1 (probably the middle of your BASIC
program!) is preserved, and is restored when the BANK MANAGER has finished.
There are three other bank selections possible (apart from the five shown below), but
they are only useful to the implementation ofCP/MPlus.
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Hardware bank switching
The BANK MANAGER supports two commands for moving screen-fulls of
information between one block and another. Blocks 4 to 7 are switched in and out
automatically as required, and the memory map is left with Block 1 switched in.
Chapter 8 Page 2 More About the Bank Manager ....