ZiLOG Z80 User Manual page 20

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The Z80 CPU contains 208 bits of R/W memory that are available to the
programmer. Figure 2 illustrates how this memory is configured to
eighteen 8-bit registers and four 16-bit registers. All Z80 registers are
implemented using static RAM. The registers include two sets of six
general-purpose registers that may be used individually as 8-bit registers
or in pairs as 16-bit registers. There are also two sets of accumulator and
flag registers and six special-purpose registers.
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