Working (Index) Registers
The 4004 provides the programmer with sixteen 4-bit registers.
These may be referenced individually by the integers 0 through 15 , or as 8 register pairs by the even integers from 0 through 14.
The register pairs may also be referenced by the symbols 0P through 7P.
These correspondences are shown as follows:
Individual Registers |
Register Pairs |
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