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#### 9.57.2.2 Register Names

The Z8000 has sixteen 16 bit registers, numbered 0 to 15. You can refer to different sized groups of registers by register number, with the prefix ‘`r`’ for 16 bit registers, ‘`rr`’ for 32 bit registers and ‘`rq`’ for 64 bit registers. You can also refer to the contents of the first eight (of the sixteen 16 bit registers) by bytes. They are named ‘`rln`’ and ‘`rhn`’.

    byte registers

    rl0 rh0 rl1 rh1 rl2 rh2 rl3 rh3
    rl4 rh4 rl5 rh5 rl6 rh6 rl7 rh7

    word registers

    r0 r1 r2 r3 r4 r5 r6 r7 r8 r9 r10 r11 r12 r13 r14 r15

    long word registers

    rr0 rr2 rr4 rr6 rr8 rr10 rr12 rr14

    quad word registers

    rq0 rq4 rq8 rq12