The microprocessor in the ZX81 has eight very powerful block instructions, which allow operations on blocks of consecutive memory bytes. Four of the instructions are block transfer instructions, which allow the contents of one block of memory bytes to be transferred to another block of memory bytes. One interesting use of these instructions is to enable a graphics display to be stored in memory and then transferred to the display file when it is to be displayed on the screen.
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- Block Transfer and Search
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