R4_MMSG
#define SC_PMASK (R4_MMSG|R4_MCD|R4_MIO)
# define MES_OUT (R4_MMSG|R4_MCD)
# define MES_IN (R4_MMSG|R4_MCD|R4_MIO)
if ((dummy & (R4_MMSG|R4_MCD|R4_MREQ)) == R4_MREQ) {