Оставлю пример здесь. Зеркалирование байта, другой способ.
Код:; Mirror byte Z80 example 1
LD HL,BYTE ; Set pointer to byte
LD DE,#5533 ; Masks to registers
LD (HL),#0F ; Set byte to memory (for example)
;----------------------------------------------------------------------
; 21 bytes, 103 t.
LD A,(HL)
AND D
ADD A,A
LD C,A
LD A,(HL)
RRA
AND D
OR C
LD B,A
RRA
RRA
AND E
LD C,A
LD A,B
AND E
ADD A,A
ADD A,A
OR C
LD (HL),A
RRD
;----------------------------------------------------------------------
LD A,(HL) ; Get result from memory to reg A
RET
;----------------------------------------------------------------------
; Mirror byte Z80 example 2
; 17 bytes, 66 t.
LD C,A
RLCA
RLCA
XOR C
AND %10101010
XOR C
LD C,A
RLCA
RLCA
RLCA
RRC C
XOR C
AND %01100110
XOR C
;----------------------------------------------------------------------
; Get result to reg A
