code: def p_asm_ld8(p):
      
      if p[2] in ('H', 'L') and p[4] in ('IXH', 'IXL', 'IYH', 'IYL'):
          p[0] = None
          error(p.lineno(0), "Unexpected token '%s'" % p[4])
      else:
          p[0] = Asm(p.lineno(1), 'LD %s,%s' % (p[2], p[4]))
docs: asm : LD reg8 COMMA reg8_hl
              | LD reg8_hl COMMA reg8
              | LD reg8 COMMA reg8
              | LD SP COMMA HL
              | LD SP COMMA reg16i
              | LD A COMMA reg8
              | LD reg8 COMMA A
              | LD reg8_hl COMMA A
              | LD A COMMA reg8_hl
              | LD A COMMA A
              | LD A COMMA I
              | LD I COMMA A
              | LD A COMMA R
              | LD R COMMA A
              | LD A COMMA reg8i
              | LD reg8i COMMA A
              | LD reg8 COMMA reg8i
              | LD reg8i COMMA regBCDE
              | LD reg8i COMMA reg8i