Vector Graphic CP/M 2 ZSM Assembler, Руководство пользователя

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2.5 Registers
The Z-80 has a number of registers, all of which have a specific symbolic
reference. ZSMsupports these references, as follows.
register B - B
register C - C
register D - D
register E - E
register H - H
register L - L
accumulator - A
memory - M
A
&
flags - PSW
Stack Ptr - SP
Index reg X - IX
Index reg Y - IY
Also may be called DE for register-pair instructions
Also may be called HL for register-pair instructions
Although not supported by ZSM, also called (HL)
Program Status ~rd, may also be called AF
Also may be called X for brevity
Also may be called Y for brevi ty
Of course, the Z-80 also has registers A', B', C', D', E', H', L', F', PC,
I, and R, but these are never explicitly referred to in an instruction, so no
special designation is needed.