com_data
inb(COMPORT + com_data);
outb(COMPORT + com_data, (u_char)c);
return(comc_ischar() ? inb(COMPORT + com_data) : -1);
inb(COMPORT + com_data);
const int com_data = 0;
outb(COMPORT + com_data, (u_char)c);
#define com_thr com_data /* transmitter holding register (W) */
#define com_rhr com_data /* receiver holding register (R) */
com->data_port = iobase + com_data;
inb(siocniobase + com_data);
(void)inb(iobase + com_data);
c = inb(iobase + com_data);
c = inb(iobase + com_data);
outb(iobase + com_data, c);
(void)sio_getreg(com, com_data);
sio_setreg(com, com_data, 0);