P2SB_WRITE
P2SB_WRITE(byte, P2SB_HIDE_OFF, 0);
P2SB_WRITE(dword, P2SB_ADDR_OFF, (port << 24) | off);
P2SB_WRITE(dword, P2SB_DATA_OFF, 0);
P2SB_WRITE(dword, P2SB_EADD_OFF, 0);
P2SB_WRITE(word, P2SB_ROUT_OFF, 0);
P2SB_WRITE(word, P2SB_STAT_OFF, (op << 8) | P2SB_BUSY);
P2SB_WRITE(byte, P2SB_HIDE_OFF, hidden);