IOP_ADDR_SEND_STATE
iop_writeb(iop, IOP_ADDR_SEND_STATE + msg->channel, IOP_MSG_NEW);
iop_writeb(iop, IOP_ADDR_SEND_STATE + chan, IOP_MSG_IDLE);
if (msg && iop_readb(iop, IOP_ADDR_SEND_STATE + chan) == IOP_MSG_IDLE)
state = iop_readb(iop, IOP_ADDR_SEND_STATE + i);